Pub Date : 2025-02-17Epub Date: 2024-12-10DOI: 10.1080/1023666X.2024.2435853
Ha Ngoc Giang , Dung Thi Phuong Truong , Xuan Kim Hoang , Tuan Nguyen Anh Huynh
Hydroxypropyl cellulose (HPC) and its rather low lower-critical-solution-temperature (LCST) were the main research targets in many recent publications. In this study, a simple and affordable approach to measure LCST using a Brookfield viscometer was presented. The setup using a popular hot plate and a silicone oil bath could well detect the HPC solution’s LCST values. The result was in good agreement with the particle size change obtained using the dynamic light scattering technique. The effect of polyacrylic acid (PAA) and other cellulose derivatives including hydroxypropyl methylcellulose (HPMC), hydroxyethyl cellulose (HEC), or sodium carboxymethyl cellulose (CMC) on HPC’s LCST was investigated. The mixture of HPC with PAA, HPMC, and CMC showed the lowest LCST. However, the effect of NaCl seemed to be stronger when the LCST value of only 28.5 °C was obtained with 1 wt% of HPC and 5 wt% of NaCl. Fourier-transformed infrared spectroscopy results also showed a stronger interaction of HPC/NaCl compared to the mixture with PAA of HPMC. The differential scanning calorimetry only detected the signal change correlated with LCST in the cooling cycle. The glass window fabricated with the current thermochromic solution was able to block and transmit visible light well at low and elevated temperatures, respectively.
{"title":"Effect of sodium chloride and water-soluble polymers on thermochromic properties of hydroxypropyl cellulose solution","authors":"Ha Ngoc Giang , Dung Thi Phuong Truong , Xuan Kim Hoang , Tuan Nguyen Anh Huynh","doi":"10.1080/1023666X.2024.2435853","DOIUrl":"10.1080/1023666X.2024.2435853","url":null,"abstract":"<div><div>Hydroxypropyl cellulose (HPC) and its rather low lower-critical-solution-temperature (LCST) were the main research targets in many recent publications. In this study, a simple and affordable approach to measure LCST using a Brookfield viscometer was presented. The setup using a popular hot plate and a silicone oil bath could well detect the HPC solution’s LCST values. The result was in good agreement with the particle size change obtained using the dynamic light scattering technique. The effect of polyacrylic acid (PAA) and other cellulose derivatives including hydroxypropyl methylcellulose (HPMC), hydroxyethyl cellulose (HEC), or sodium carboxymethyl cellulose (CMC) on HPC’s LCST was investigated. The mixture of HPC with PAA, HPMC, and CMC showed the lowest LCST. However, the effect of NaCl seemed to be stronger when the LCST value of only 28.5 °C was obtained with 1 wt% of HPC and 5 wt% of NaCl. Fourier-transformed infrared spectroscopy results also showed a stronger interaction of HPC/NaCl compared to the mixture with PAA of HPMC. The differential scanning calorimetry only detected the signal change correlated with LCST in the cooling cycle. The glass window fabricated with the current thermochromic solution was able to block and transmit visible light well at low and elevated temperatures, respectively.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 2","pages":"Pages 109-121"},"PeriodicalIF":1.7,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The fabrication of graphene-based nanocomposites has been a topic of increasing interest due to graphene’s exceptional physical properties and the ability to enhance the properties of various polymeric materials. Evaluating the biocompatibility of these nanocomposites is crucial to ensure their safe and effective use in biomedical applications. This study characterized and assessed the biocompatibility of previously fabricated electrospun polyvinyl alcohol (PVA)/reduced graphene oxide rGO fibrous structures by conducting a comprehensive assessment of their physical and biological characteristics. Contact angle measurements revealed that adding rGO to electrospun PVA fibers enhanced the surface wettability, improving the fibrous structure’s PBS absorption capacity and degradation behavior. Including the rGO content resulted in a higher water vapor transmission rate, reaching ∼48 g/m2·day for PVA + 0.5 wt.% rGO and ∼45 g/m2·day for PVA + 1.0 wt.% rGO, compared to ∼40 g/m2·day for electrospun PVA fibers. Cell culture studies, including MTT assay, alkaline phosphatase (ALP) activity analysis, alizarin red staining, fluorescence microscopy, and SEM analyses, demonstrated that electrospun PVA + 1.0 wt.% rGO nanocomposites exhibited superior cell viability, proliferation, and growth compared to other samples, due to the improved physical properties of the PVA + 1.0 wt.% rGO fibrous structure.
{"title":"Physical and biological characteristics of electrospun poly (vinyl alcohol) and reduced graphene oxide nanofibrous structure","authors":"Hilal Turkoglu Sasmazel , Marwa Alazzawi , Melike Gozutok , Veera Sadhu","doi":"10.1080/1023666X.2024.2424264","DOIUrl":"10.1080/1023666X.2024.2424264","url":null,"abstract":"<div><div>The fabrication of graphene-based nanocomposites has been a topic of increasing interest due to graphene’s exceptional physical properties and the ability to enhance the properties of various polymeric materials. Evaluating the biocompatibility of these nanocomposites is crucial to ensure their safe and effective use in biomedical applications. This study characterized and assessed the biocompatibility of previously fabricated electrospun polyvinyl alcohol (PVA)/reduced graphene oxide rGO fibrous structures by conducting a comprehensive assessment of their physical and biological characteristics. Contact angle measurements revealed that adding rGO to electrospun PVA fibers enhanced the surface wettability, improving the fibrous structure’s PBS absorption capacity and degradation behavior. Including the rGO content resulted in a higher water vapor transmission rate, reaching ∼48 g/m<sup>2</sup>·day for PVA + 0.5 wt.% rGO and ∼45 g/m<sup>2</sup>·day for PVA + 1.0 wt.% rGO, compared to ∼40 g/m<sup>2</sup>·day for electrospun PVA fibers. Cell culture studies, including MTT assay, alkaline phosphatase (ALP) activity analysis, alizarin red staining, fluorescence microscopy, and SEM analyses, demonstrated that electrospun PVA + 1.0 wt.% rGO nanocomposites exhibited superior cell viability, proliferation, and growth compared to other samples, due to the improved physical properties of the PVA + 1.0 wt.% rGO fibrous structure.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 1","pages":"Pages 83-97"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-02Epub Date: 2024-11-29DOI: 10.1080/1023666X.2024.2421816
Xu Zhang , Meng Zhang , Handong Li , Zhi Wang , Hua Xie
Manganese phytate (MnPa) was prepared and synergistically combined with expandable graphite (EG) flame retardant modified polyurethane foam (PUF). Utilizing thermogravimetric (TG), pyrolysis kinetic analysis, CONE analysis, smoke toxicity analysis, limiting oxygen index (LOI), and UL-94 horizontal combustion test procedures, the thermal stability and combustion parameters of the modified PUFs were examined. The flame retardancy and smoke suppression of the modified PUFs were analyzed based on the heat release rate (HRR), total heat release (THR), smoke production rate (SPR), and total smoke release (TSR). The results showed that MEPUF3 had the highest thermal decomposition rate temperature, initial thermogravimetric temperature, and activation energy (E). It was shown that MEPUF3 had the lowest HRR of 17.68 kW/m2, the lowest THR of 1.15 MJ/m2, the lowest SPR of 0.0046 m2/s, the lowest TSR of 19.58 m2/m2, the lowest Ds of 32.1, the highest transmittance of 57.7%, and the highest LOI of 23.0%. The present study showed that MEPUF3 possessed good thermal stability and flame retardant properties, which provided useful references for subsequent phytate and EG-modified PUFs.
{"title":"Thermal stability and combustion properties of polyurethane foam modified with manganese phytate and expandable graphite","authors":"Xu Zhang , Meng Zhang , Handong Li , Zhi Wang , Hua Xie","doi":"10.1080/1023666X.2024.2421816","DOIUrl":"10.1080/1023666X.2024.2421816","url":null,"abstract":"<div><div>Manganese phytate (MnPa) was prepared and synergistically combined with expandable graphite (EG) flame retardant modified polyurethane foam (PUF). Utilizing thermogravimetric (TG), pyrolysis kinetic analysis, CONE analysis, smoke toxicity analysis, limiting oxygen index (LOI), and UL-94 horizontal combustion test procedures, the thermal stability and combustion parameters of the modified PUFs were examined. The flame retardancy and smoke suppression of the modified PUFs were analyzed based on the heat release rate (HRR), total heat release (THR), smoke production rate (SPR), and total smoke release (TSR). The results showed that MEPUF3 had the highest thermal decomposition rate temperature, initial thermogravimetric temperature, and activation energy (E). It was shown that MEPUF3 had the lowest HRR of 17.68 kW/m<sup>2</sup>, the lowest THR of 1.15 MJ/m<sup>2</sup>, the lowest SPR of 0.0046 m<sup>2</sup>/s, the lowest TSR of 19.58 m<sup>2</sup>/m<sup>2</sup>, the lowest Ds of 32.1, the highest transmittance of 57.7%, and the highest LOI of 23.0%. The present study showed that MEPUF3 possessed good thermal stability and flame retardant properties, which provided useful references for subsequent phytate and EG-modified PUFs.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 1","pages":"Pages 47-67"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-02Epub Date: 2024-11-15DOI: 10.1080/1023666X.2024.2425720
Xiaoliang Zeng , Hua Mao , Qijun Liu , Fuxiang Li , Xinsheng Lan , Fangqiang Wang , Yu Song , Mingwei Li , Tianhao Zhang
In this work, the decorated polyborosiloxane (MAPBS) with phosphorus-nitrogen components was first synthesized via a hydrolysis-condensation reaction and thus incorporated the MAPBS filler into epoxy resin (EP) to fabricate composites by a simple blending method. It could be found that the MAPBS with epoxy groups showed a good dispersion level in the EP matrix, endowing EP composites with superior flame retardancy and mechanical properties. Thanks to the combination of phosphorus-, nitrogen-, boron-, and silica-containing units in MAPBS filler, the addition of 6 wt% MAPBS made EP achieve significantly improved limiting oxygen index (25.2 ± 0.5%) and UL-94 rating (V1). Meanwhile, cone calorimeter test results revealed that the peak heat release rate (PHRR), total heat release (THR), and total smoke production (TSP) of the EP-MAPBS6 composite were reduced by 31%, 62%, and 67%, respectively, as compared to the pure EP. In addition, the MAPBS6 composite exhibited balanced tensile strength (105.1 MPa) and elongation at break (87.6%) among the prepared samples. The present work provides an effective strategy to fabricate EP composites with improved comprehensive performances.
{"title":"Synthesis of decorated polyborosiloxane for enhancing the flame retardancy and mechanical property of epoxy resin","authors":"Xiaoliang Zeng , Hua Mao , Qijun Liu , Fuxiang Li , Xinsheng Lan , Fangqiang Wang , Yu Song , Mingwei Li , Tianhao Zhang","doi":"10.1080/1023666X.2024.2425720","DOIUrl":"10.1080/1023666X.2024.2425720","url":null,"abstract":"<div><div>In this work, the decorated polyborosiloxane (MAPBS) with phosphorus-nitrogen components was first synthesized via a hydrolysis-condensation reaction and thus incorporated the MAPBS filler into epoxy resin (EP) to fabricate composites by a simple blending method. It could be found that the MAPBS with epoxy groups showed a good dispersion level in the EP matrix, endowing EP composites with superior flame retardancy and mechanical properties. Thanks to the combination of phosphorus-, nitrogen-, boron-, and silica-containing units in MAPBS filler, the addition of 6 wt% MAPBS made EP achieve significantly improved limiting oxygen index (25.2 ± 0.5%) and UL-94 rating (V1). Meanwhile, cone calorimeter test results revealed that the peak heat release rate (PHRR), total heat release (THR), and total smoke production (TSP) of the EP-MAPBS6 composite were reduced by 31%, 62%, and 67%, respectively, as compared to the pure EP. In addition, the MAPBS6 composite exhibited balanced tensile strength (105.1 MPa) and elongation at break (87.6%) among the prepared samples. The present work provides an effective strategy to fabricate EP composites with improved comprehensive performances.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 1","pages":"Pages 98-108"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-02Epub Date: 2024-10-30DOI: 10.1080/1023666X.2024.2416212
P. Saranya , K. Sundaramahalingam , D. Vanitha , M. Nandhinilakshmi , V. N. Vijayakumar
A solid bio polymer electrolyte (SPE) based on tamarind gum (TG) and magnesium nitrate was synthesized by a solution casting technique. The amorphous behavior is observed by X-ray diffraction (XRD) analysis, and the degree of crystallinity is calculated from the XRD deconvolution spectra. The interaction between the polymer and the salt was confirmed by Fourier transform infrared (FTIR) analysis. Using FTIR deconvolution spectra, the percentage of free ions can be calculated. The glass transition temperature (Tg) was determined via differential scanning calorimetry (DSC). A higher ionic conductivity (σ) of 1.97 × 10−4 S/cm is observed for the sample with 1 g of tamarind gum and 0.5 g of magnesium nitrate (4 TMN). The conduction mechanism shows that sample 4 TMN obeys the quantum mechanical tunneling model (QMT) at low frequency. The prepared SPEs follow the Arrhenius behavior, and the minimum activation energy (Ea) of 0.207 eV is observed for sample 4 TMN. The lowest relaxation time (τ) was 3.46 × 10−7 s for 4-TMN according to the tangent spectra. The transference number of ions (tion) is calculated by Wagner’s polarization method. The electrochemical stability window observed by linear sweep voltammetry (LSV) is 2.25 V. The primary battery is fabricated by using sample 4TMN, and an open circuit voltage (OCV) of 2.01 V is observed.
{"title":"Tamarind gum based magnesium ion conducting polymer membrane for energy storage applications","authors":"P. Saranya , K. Sundaramahalingam , D. Vanitha , M. Nandhinilakshmi , V. N. Vijayakumar","doi":"10.1080/1023666X.2024.2416212","DOIUrl":"10.1080/1023666X.2024.2416212","url":null,"abstract":"<div><div>A solid bio polymer electrolyte (SPE) based on tamarind gum (TG) and magnesium nitrate was synthesized by a solution casting technique. The amorphous behavior is observed by X-ray diffraction (XRD) analysis, and the degree of crystallinity is calculated from the XRD deconvolution spectra. The interaction between the polymer and the salt was confirmed by Fourier transform infrared (FTIR) analysis. Using FTIR deconvolution spectra, the percentage of free ions can be calculated. The glass transition temperature (T<sub>g</sub>) was determined via differential scanning calorimetry (DSC). A higher ionic conductivity (σ) of 1.97 × 10<sup>−4</sup> S/cm is observed for the sample with 1 g of tamarind gum and 0.5 g of magnesium nitrate (4 TMN). The conduction mechanism shows that sample 4 TMN obeys the quantum mechanical tunneling model (QMT) at low frequency. The prepared SPEs follow the Arrhenius behavior, and the minimum activation energy (E<sub>a</sub>) of 0.207 eV is observed for sample 4 TMN. The lowest relaxation time (τ) was 3.46 × 10<sup>−7</sup> s for 4-TMN according to the tangent spectra. The transference number of ions (t<sub>ion</sub>) is calculated by Wagner’s polarization method. The electrochemical stability window observed by linear sweep voltammetry (LSV) is 2.25 V. The primary battery is fabricated by using sample 4TMN, and an open circuit voltage (OCV) of 2.01 V is observed.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 1","pages":"Pages 1-25"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-02Epub Date: 2024-11-02DOI: 10.1080/1023666X.2024.2419050
Surjit Kaur , Mithu Maiti Jana , Asim Kumar Jana
This research article describes the physicochemical modification of mercerized Yucca filamentosa (Yfm) fiber by graft copolymerization with ethylmethacrylate, using ferrous ammonium sulfate-potassium persulfate (FAS-KPS) as a redox initiator. Initially, six process parameters; reaction duration, reaction temperature, solvent amount, pH, FAS:KPS ratio, and monomer concentration were used in the study in a sequential experimental design technique, and the significant process variables affecting the yield of the graft copolymer were identified. The resolution-V design method identified the significant parameters as the reaction temperature, amount of solvent, and the concentration of monomer. In second phase of the study, the screened variables were utilized in the development of a model through the technique of response surface methodology (RSM) for the prediction of the yields, and its optimization. The developed RSM model fitted well with the experimental data, and predicted for the optimal conditions of reactions as reaction duration 120 min, pH 7.0, and the monomer 2.96 × 10−3 mol/L; at which the highest graft yield percentage obtained was 133.7%. The techniques of FTIR, SEM, and XRD were used for the characterization of untreated fiber, mercerized fiber, and graft copolymers. Studies of the various physico-chemical properties showed that the produced graft copolymers were more resistant to acid and base than the both natural and mercerized fibers.
{"title":"Induction of physico-chemical properties in mercerized Yucca filamentosa fiber-based graft copolymer through response surface methodology and its characterization","authors":"Surjit Kaur , Mithu Maiti Jana , Asim Kumar Jana","doi":"10.1080/1023666X.2024.2419050","DOIUrl":"10.1080/1023666X.2024.2419050","url":null,"abstract":"<div><div>This research article describes the physicochemical modification of mercerized <em>Yucca filamentosa (Yf<sub>m</sub>)</em> fiber by graft copolymerization with ethylmethacrylate, using ferrous ammonium sulfate-potassium persulfate (FAS-KPS) as a redox initiator. Initially, six process parameters; reaction duration, reaction temperature, solvent amount, pH, FAS:KPS ratio, and monomer concentration were used in the study in a sequential experimental design technique, and the significant process variables affecting the yield of the graft copolymer were identified. The resolution-V design method identified the significant parameters as the reaction temperature, amount of solvent, and the concentration of monomer. In second phase of the study, the screened variables were utilized in the development of a model through the technique of response surface methodology (RSM) for the prediction of the yields, and its optimization. The developed RSM model fitted well with the experimental data, and predicted for the optimal conditions of reactions as reaction duration 120 min, pH 7.0, and the monomer 2.96 × 10<sup>−3 </sup>mol/L; at which the highest graft yield percentage obtained was 133.7%. The techniques of FTIR, SEM, and XRD were used for the characterization of untreated fiber, mercerized fiber, and graft copolymers. Studies of the various physico-chemical properties showed that the produced graft copolymers were more resistant to acid and base than the both natural and mercerized fibers.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 1","pages":"Pages 26-46"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-02Epub Date: 2024-11-09DOI: 10.1080/1023666X.2024.2421817
Mariana S. Aquino , Juliana P. Senna , Claudia R. E. Mansur
Polymers play a crucial role in enhanced oil recovery (EOR) by increasing the viscosity of injection fluids and enhancing oil displacement. The widely used polymer, partially hydrolyzed polyacrylamide (HPAM), faces performance degradation in high-salinity and high-temperature environments. This study explores galactomannan from Stryphnodendron polyphyllum seeds as an alternative viscosifying agent for EOR fluids. An extraction process for galactomannan from Barbatimão Verdadeiro seeds was developed, yielding 23.3% m/m. The biopolymer was characterized using Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA), and size exclusion chromatography (SEC). Rheological behavior was tested in brines of different salinities, and injectivity/filterability tests were performed following API RP 63:1990 standards. The galactomannan obtained from Stryphnodendron polyphyllum exhibited a mannose-to-galactose ratio of 1.32. Rheological analysis showed pseudoplastic behavior, with viscosities of 38 cP in brine solutions at 7.37 s−1 and 60 °C. Filterability tests demonstrated satisfactory injectivity with factors of 1.09 (8 µm) and 0.67 (1.2 µm). Compared to HPAM, galactomannan exhibited superior viscosity retention in high-salinity conditions, where HPAM dropped to 6 cP. The galactomannan extracted from Stryphnodendron polyphyllum seeds is a promising biopolymer for EOR applications, offering superior performance under harsh conditions compared to traditional HPAM. Its resilience to high salinity and temperature makes it a viable alternative for pre-salt and offshore fields, contributing to more sustainable and efficient oil recovery.
聚合物通过增加注入液的粘度和提高驱油量，在提高采收率（EOR）方面发挥着至关重要的作用。部分水解聚丙烯酰胺（HPAM）是一种广泛应用的聚合物，在高盐度和高温环境中存在性能退化问题。本研究探讨了半乳甘露聚糖作为提高采收率液体的一种替代增粘剂。开发了从baratim o Verdadeiro种子中提取半乳甘露聚糖的工艺，产量为23.3% m/m。采用傅里叶变换红外光谱（FTIR）、核磁共振（NMR）、热重分析（TGA）和粒径排除色谱（SEC）对该生物聚合物进行了表征。在不同盐度的盐水中测试了流变行为，并按照API RP 63:1990标准进行了注入性/滤过性测试。从毛茛中提取的半乳甘露聚糖甘露糖与半乳糖的比值为1.32。流变学分析显示出假塑性行为，在7.37 s−1和60°C的盐水溶液中粘度为38 cP。滤过性测试表明，注入率为1.09（8µm）和0.67(1.2µm)，令人满意。与HPAM相比，半乳甘露聚糖在高盐度条件下表现出更好的粘度保持，HPAM降至6 cP。从毛茛种子中提取的半乳甘露聚糖是一种很有前途的EOR生物聚合物，与传统的HPAM相比，它在恶劣条件下具有优越的性能。它对高盐度和高温度的适应性使其成为盐下油田和海上油田的可行替代方案，有助于实现更可持续、更高效的采油。
{"title":"Extraction, characterization, and evaluation of galactomannan from Barbatimão Verdadeiro as a potential additive for enhanced oil recovery fluids","authors":"Mariana S. Aquino , Juliana P. Senna , Claudia R. E. Mansur","doi":"10.1080/1023666X.2024.2421817","DOIUrl":"10.1080/1023666X.2024.2421817","url":null,"abstract":"<div><div>Polymers play a crucial role in enhanced oil recovery (EOR) by increasing the viscosity of injection fluids and enhancing oil displacement. The widely used polymer, partially hydrolyzed polyacrylamide (HPAM), faces performance degradation in high-salinity and high-temperature environments. This study explores galactomannan from <em>Stryphnodendron polyphyllum</em> seeds as an alternative viscosifying agent for EOR fluids. An extraction process for galactomannan from Barbatimão Verdadeiro seeds was developed, yielding 23.3% m/m. The biopolymer was characterized using Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA), and size exclusion chromatography (SEC). Rheological behavior was tested in brines of different salinities, and injectivity/filterability tests were performed following API RP 63:1990 standards. The galactomannan obtained from <em>Stryphnodendron polyphyllum</em> exhibited a mannose-to-galactose ratio of 1.32. Rheological analysis showed pseudoplastic behavior, with viscosities of 38 cP in brine solutions at 7.37 s<sup>−1</sup> and 60 °C. Filterability tests demonstrated satisfactory injectivity with factors of 1.09 (8 µm) and 0.67 (1.2 µm). Compared to HPAM, galactomannan exhibited superior viscosity retention in high-salinity conditions, where HPAM dropped to 6 cP. The galactomannan extracted from <em>Stryphnodendron polyphyllum</em> seeds is a promising biopolymer for EOR applications, offering superior performance under harsh conditions compared to traditional HPAM. Its resilience to high salinity and temperature makes it a viable alternative for pre-salt and offshore fields, contributing to more sustainable and efficient oil recovery.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 1","pages":"Pages 68-82"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-16Epub Date: 2024-09-17DOI: 10.1080/1023666X.2024.2398152
Sumbal Anwar , Saad Liaqat , Riaz Ullah , Zafar Iqbal , Fozia Rahman , Essam A. Ali , Umar Nishan , Sandleen Feroz , Nawshad Muhammad
This study aims to determine and compare the dimensional stability, setting time, tensile strength, and rheological properties of kaolin clay powder-modified and unmodified alginate impression material. Commercially available alginate-based impression material was considered as a control (C) while experimental groups E-1, E-2, and E-3 were fabricated by adding 2%, 4%, and 8% of kaolin clay powder in the control, respectively. Analytical techniques were used for the characterization of the samples. A tensile strength, rheological property, dimensional stability, and setting time were recorded for control and experimental groups. FTIR analysis confirmed the presence of kaolin clay powder in all experimental groups. SEM showed a round solid structure and irregular shape particle appearance in all experimental groups as well as a control group. The dimensional stability was improved by the addition of kaolin clay powder to the alginate impression material. The percentage dimensional change at 5 min, 6, and 12 h was increased for E3 adding (8% kaolin clay powder) and decreased for the control group. The mean value of tensile strength was highest for E3 followed by E2, E1, and least in control groups. Higher Young’s Modulus and lower deformation values were measured for E3. The mean value of setting time was highest for E3 and the least was in the control group. The results for both setting time and tensile strength were very highly statistically significant (p < 0.001). The mean values of viscoelasticity, flow, and drip test were increased statistically by adding various concentrations of kaolin clay powder to the alginate impression material.
{"title":"Evaluation of dimensional stability, setting time, tensile strength, and rheological properties of kaolin clay incorporated alginate impression material","authors":"Sumbal Anwar , Saad Liaqat , Riaz Ullah , Zafar Iqbal , Fozia Rahman , Essam A. Ali , Umar Nishan , Sandleen Feroz , Nawshad Muhammad","doi":"10.1080/1023666X.2024.2398152","DOIUrl":"10.1080/1023666X.2024.2398152","url":null,"abstract":"<div><div>This study aims to determine and compare the dimensional stability, setting time, tensile strength, and rheological properties of kaolin clay powder-modified and unmodified alginate impression material. Commercially available alginate-based impression material was considered as a control (C) while experimental groups E-1, E-2, and E-3 were fabricated by adding 2%, 4%, and 8% of kaolin clay powder in the control, respectively. Analytical techniques were used for the characterization of the samples. A tensile strength, rheological property, dimensional stability, and setting time were recorded for control and experimental groups. FTIR analysis confirmed the presence of kaolin clay powder in all experimental groups. SEM showed a round solid structure and irregular shape particle appearance in all experimental groups as well as a control group. The dimensional stability was improved by the addition of kaolin clay powder to the alginate impression material. The percentage dimensional change at 5 min, 6, and 12 h was increased for E3 adding (8% kaolin clay powder) and decreased for the control group. The mean value of tensile strength was highest for E3 followed by E2, E1, and least in control groups. Higher Young’s Modulus and lower deformation values were measured for E3. The mean value of setting time was highest for E3 and the least was in the control group. The results for both setting time and tensile strength were very highly statistically significant (<em>p</em> < 0.001). The mean values of viscoelasticity, flow, and drip test were increased statistically by adding various concentrations of kaolin clay powder to the alginate impression material.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"29 8","pages":"Pages 602-617"},"PeriodicalIF":1.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-16Epub Date: 2024-10-24DOI: 10.1080/1023666X.2024.2410746
Pragnesh N. Dave , Pradip M. Macwan , Bhagvan Kamaliya
In this work, Gum ghatti-cl-poly(acrylic acid)/CoFe2O4 (GGAACF) hydrogels were synthesized using a free radical polymerization technique, with CoFe2O4 nanoparticles incorporated via a co-precipitation method using nitrates as precursors. Thermal gravimetric analysis (TGA) revealed that the inclusion of CoFe2O4 nanoparticles enhanced the thermal stability of the hydrogels. Swelling studies indicated that the addition of 30 mg of CoFe2O4 nanoparticles maximized water retention. Rheological assessments demonstrated non-Newtonian behavior, with flow curves fitted best by the Power Law model. The incorporation of CoFe2O4 nanoparticles significantly improved the hydrogel’s elasticity and viscosity, as evidenced by a higher storage modulus (G′) compared to the loss modulus (G″) across all frequencies, indicating the elastic nature of the hydrogels. The decrease in complex viscosity with increasing frequency confirmed the pseudoplastic properties of the hydrogels, attributed to the random alignment of CoFe2O4 nanoparticles within the matrix. Tan δ values were below unity at all tested frequencies, underscoring the hydrogels’ strong elastic properties. These findings highlight the effectiveness of rheological analysis in characterizing the viscoelastic behavior of polymer hydrogels, which can be tailored for various applications.
{"title":"Synthesis, rheological and thermal studies of Gum ghatti-cl-poly(acrylic acid) hydrogels containing CoFe2O4 nanoparticles","authors":"Pragnesh N. Dave , Pradip M. Macwan , Bhagvan Kamaliya","doi":"10.1080/1023666X.2024.2410746","DOIUrl":"10.1080/1023666X.2024.2410746","url":null,"abstract":"<div><div>In this work, Gum ghatti-cl-poly(acrylic acid)/CoFe<sub>2</sub>O<sub>4</sub> (GGAACF) hydrogels were synthesized using a free radical polymerization technique, with CoFe<sub>2</sub>O<sub>4</sub> nanoparticles incorporated via a co-precipitation method using nitrates as precursors. Thermal gravimetric analysis (TGA) revealed that the inclusion of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles enhanced the thermal stability of the hydrogels. Swelling studies indicated that the addition of 30 mg of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles maximized water retention. Rheological assessments demonstrated non-Newtonian behavior, with flow curves fitted best by the Power Law model. The incorporation of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles significantly improved the hydrogel’s elasticity and viscosity, as evidenced by a higher storage modulus (G′) compared to the loss modulus (G″) across all frequencies, indicating the elastic nature of the hydrogels. The decrease in complex viscosity with increasing frequency confirmed the pseudoplastic properties of the hydrogels, attributed to the random alignment of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles within the matrix. Tan δ values were below unity at all tested frequencies, underscoring the hydrogels’ strong elastic properties. These findings highlight the effectiveness of rheological analysis in characterizing the viscoelastic behavior of polymer hydrogels, which can be tailored for various applications.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"29 8","pages":"Pages 658-674"},"PeriodicalIF":1.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-16Epub Date: 2024-09-30DOI: 10.1080/1023666X.2024.2399219
R. Udhayasankar , B. Karthikeyan , K. Murugan , A. Balaji
The development of manufacturing industries is crucial for national progress, with a growing emphasis on green and sustainable practices. This study investigates the development and performance of hybrid polymer composites based on poly lactic acid (PLA) reinforced with lignocellulosic fillers: bagasse fiber (BF), tamarind seed fiber (TSF), Terminalia chebula fiber (TCF), and a hybrid filler of bagasse, tamarind seed, and Terminalia chebula (BTSTCF). Five types of composites were fabricated with varying filler compositions: PLA, PLA/BF, PLA/TSF, PLA/TCF, and PLA/BTSTCF, consisting of 30% BF, TSF, or TCF with 70% PLA, and an additional 10% of each filler in the BTSTCF composite. The results demonstrated that the PLA/BTSTCF hybrid composite outperformed others regarding mechanical strength, thermal stability, and interfacial adhesion. Specifically, it exhibited superior flexural strength, impact strength, and tensile strength. The findings indicate that incorporating a combination of bagasse, tamarind seed, and Terminalia chebula fillers into PLA significantly enhances its properties and performance. This study contributes to advancing sustainable and green manufacturing practices and holds promise for economic growth through the development of high-performance, eco-friendly materials.
{"title":"Hybrid polymer composites of Terminalia chebula filler reinforced thermal and mechanical characterization of bagasse/tamarind seed","authors":"R. Udhayasankar , B. Karthikeyan , K. Murugan , A. Balaji","doi":"10.1080/1023666X.2024.2399219","DOIUrl":"10.1080/1023666X.2024.2399219","url":null,"abstract":"<div><div>The development of manufacturing industries is crucial for national progress, with a growing emphasis on green and sustainable practices. This study investigates the development and performance of hybrid polymer composites based on poly lactic acid (PLA) reinforced with lignocellulosic fillers: bagasse fiber (BF), tamarind seed fiber (TSF), <em>Terminalia chebula</em> fiber (TCF), and a hybrid filler of bagasse, tamarind seed, and <em>Terminalia chebula</em> (BTSTCF). Five types of composites were fabricated with varying filler compositions: PLA, PLA/BF, PLA/TSF, PLA/TCF, and PLA/BTSTCF, consisting of 30% BF, TSF, or TCF with 70% PLA, and an additional 10% of each filler in the BTSTCF composite. The results demonstrated that the PLA/BTSTCF hybrid composite outperformed others regarding mechanical strength, thermal stability, and interfacial adhesion. Specifically, it exhibited superior flexural strength, impact strength, and tensile strength. The findings indicate that incorporating a combination of bagasse, tamarind seed, and <em>Terminalia chebula</em> fillers into PLA significantly enhances its properties and performance. This study contributes to advancing sustainable and green manufacturing practices and holds promise for economic growth through the development of high-performance, eco-friendly materials.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"29 8","pages":"Pages 618-634"},"PeriodicalIF":1.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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