The present study aims to explore the cytotoxicity, physicomechanical, thermal, and barrier properties of Juglans regia leaf fiber (J) reinforced PHB-based films, with a focus on evaluating their suitability for biomedical applications. In this work, scaffolds are developed by incorporating varying concentrations (0.5%, 1%, 1.5%, 2% and 2.5%) of J into poly(hydroxybutyrate)/poly(vinylacetate) matrix by solvent casting. These are characterized through Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), thermo-gravimetric analysis (TGA), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA). The results indicated that the sample containing 1.0% (by weight) J (PJ1.0) results in maximum values of the tensile strength (25 MPa) and storage modulus (1.61 GPa) at – 20 °C. Moreover, this sample exhibited favorable thermal, water barrier, and wettability properties. The hydrolytic degradation behavior of the composites is also studied at pH 7.4 and 37 °C for 16 weeks. It is observed that PJ1.0 degrades by 45%, whereas PHB experiences 18% degradation. Furthermore, the cytotoxic nature of the scaffolds is also assessed using C2C12 mouse skeletal muscle cell lines. The results confirmed that PJ1.0 does not show any cytotoxic effects when compared to pure PHB. Thus, findings of this study suggested the potential of Juglans regia fiber for the development of sustainable and mechanically robust materials for biomedical applications.
{"title":"Cell viability assessment and physicomechanical characterization of Juglans regia leaf fiber-reinforced poly(hydroxybutyrate) films for biomedical uses","authors":"Simran Ahuja, Neha Bansal, Mahak Mittal, Kapil Gulati, Ashwani Mittal, Sanjiv Arora","doi":"10.1007/s13726-024-01367-w","DOIUrl":"https://doi.org/10.1007/s13726-024-01367-w","url":null,"abstract":"<p>The present study aims to explore the cytotoxicity, physicomechanical, thermal, and barrier properties of <i>Juglans regia</i> leaf fiber (J) reinforced PHB-based films, with a focus on evaluating their suitability for biomedical applications. In this work, scaffolds are developed by incorporating varying concentrations (0.5%, 1%, 1.5%, 2% and 2.5%) of J into poly(hydroxybutyrate)/poly(vinylacetate) matrix by solvent casting. These are characterized through Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), thermo-gravimetric analysis (TGA), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA). The results indicated that the sample containing 1.0% (by weight) J (PJ1.0) results in maximum values of the tensile strength (25 MPa) and storage modulus (1.61 GPa) at – 20 °C. Moreover, this sample exhibited favorable thermal, water barrier, and wettability properties. The hydrolytic degradation behavior of the composites is also studied at pH 7.4 and 37 °C for 16 weeks. It is observed that PJ1.0 degrades by 45%, whereas PHB experiences 18% degradation. Furthermore, the cytotoxic nature of the scaffolds is also assessed using C2C12 mouse skeletal muscle cell lines. The results confirmed that PJ1.0 does not show any cytotoxic effects when compared to pure PHB. Thus, findings of this study suggested the potential of <i>Juglans regia</i> fiber for the development of sustainable and mechanically robust materials for biomedical applications.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141941258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, to improve the antifouling and separation performance of polycarbonate (PC) membranes in the petroleum refinery wastewater treatment, various amounts of magnesium–aluminum (Mg–Al)-layered double hydroxide (LDH) nanoparticles (0–2 wt%) were incorporated into PC membrane, for the first time. The Fourier transform infrared (FTIR), X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) characterizations confirmed the synthesis of Mg–Al LDH structure through the hydrothermal method, with different counter anions including nitrate (NO3−) and carbonate (CO32−) presented in the interlayer spaces. The characteristics of the fabricated membranes were investigated using water contact angle and porosity analyses, FESEM and atomic force microscopy (AFM) techniques and mechanical properties. All membranes modified with Mg–Al LDH hydrophilic nanoparticles showed a lower water contact angle and higher porosity as compared to the neat PC membrane. The FESEM micrographs of the cross section of the membrane indicated that the inclusion of CO3.Mg–Al LDH nanoparticles in the PC matrix led to the removal of the sponge-like layer of the membrane. The results of the petroleum refinery wastewater filtration experiment revealed that the irreversible fouling ratio (IFR) value decreased from 66.7% for the neat PC membrane to 10.5% and 19.1% for PC/CO3 Mg–Al LDH-1.5 and PC/NO3 Mg–Al LDH-1.5 nanocomposite membranes, respectively. The membrane separation performance, measured by the total organic carbon (TOC) indicated that filtrates from all nanocomposite membranes had lower TOC values compared to the neat PC membrane.
Graphical abstract
为了提高聚碳酸酯（PC）膜在石油精炼废水处理中的防污和分离性能，本研究首次在 PC 膜中加入了不同含量的镁铝（Mg-Al）-层状双氢氧化物（LDH）纳米颗粒（0-2 wt%）。傅立叶变换红外光谱（FTIR）、X 射线衍射（XRD）和场发射扫描电子显微镜（FESEM）表征证实，通过水热法合成了镁铝 LDH 结构，层间存在不同的反阴离子，包括硝酸盐（NO3-）和碳酸盐（CO32-）。利用水接触角和孔隙率分析、FESEM 和原子力显微镜（AFM）技术以及机械性能研究了所制备膜的特性。与纯 PC 膜相比，所有用 Mg-Al LDH 亲水纳米粒子修饰的膜都显示出较低的水接触角和较高的孔隙率。膜横截面的 FESEM 显微照片显示，在 PC 基质中加入 CO3.Mg-Al LDH 纳米粒子后，膜的海绵状层被去除。石油精炼废水过滤实验结果表明，不可逆污垢率（IFR）值从纯 PC 膜的 66.7% 下降到 PC/CO3 Mg-Al LDH-1.5 和 PC/NO3 Mg-Al LDH-1.5 纳米复合膜的 10.5% 和 19.1%。以总有机碳（TOC）衡量的膜分离性能表明，与纯 PC 膜相比，所有纳米复合膜滤液的 TOC 值都较低。
{"title":"Polycarbonate ultrafiltration membrane modified with Mg–Al-layered double hydroxide nanoparticles for treatment of petroleum refinery wastewater","authors":"Masoumeh Zaremanesh, Habib Etemadi, Erfan Shafaati, Ghader Hosseinzadeh, Alireza Yousefi","doi":"10.1007/s13726-024-01364-z","DOIUrl":"https://doi.org/10.1007/s13726-024-01364-z","url":null,"abstract":"<p>In this work, to improve the antifouling and separation performance of polycarbonate (PC) membranes in the petroleum refinery wastewater treatment, various amounts of magnesium–aluminum (Mg–Al)-layered double hydroxide (LDH) nanoparticles (0–2 wt%) were incorporated into PC membrane, for the first time. The Fourier transform infrared (FTIR), X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) characterizations confirmed the synthesis of Mg–Al LDH structure through the hydrothermal method, with different counter anions including nitrate (NO<sub>3</sub><sup>−</sup>) and carbonate (CO<sub>3</sub><sup>2−</sup>) presented in the interlayer spaces. The characteristics of the fabricated membranes were investigated using water contact angle and porosity analyses, FESEM and atomic force microscopy (AFM) techniques and mechanical properties. All membranes modified with Mg–Al LDH hydrophilic nanoparticles showed a lower water contact angle and higher porosity as compared to the neat PC membrane. The FESEM micrographs of the cross section of the membrane indicated that the inclusion of CO<sub>3</sub>.Mg–Al LDH nanoparticles in the PC matrix led to the removal of the sponge-like layer of the membrane. The results of the petroleum refinery wastewater filtration experiment revealed that the irreversible fouling ratio (IFR) value decreased from 66.7% for the neat PC membrane to 10.5% and 19.1% for PC/CO<sub>3</sub> Mg–Al LDH-1.5 and PC/NO<sub>3</sub> Mg–Al LDH-1.5 nanocomposite membranes, respectively. The membrane separation performance, measured by the total organic carbon (TOC) indicated that filtrates from all nanocomposite membranes had lower TOC values compared to the neat PC membrane.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141941260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-04DOI: 10.1007/s13726-024-01358-x
Rezvene Nayeb Abbasi, Mehdi Rafizadeh
The introduction of long-chain branches can significantly increase the melt strength and processability of the polyesters. Hence, in the present study, a number of long-chain branched copolyesters were synthesized and the effect of branching agent on the properties of copolyesters was examined. Pentaerythritol (PER) and trimellitic anhydride (TMA) were used as branching agents for the synthesis of poly(butylene succinate-co-ethylene terephthalate) (PBSET). Microstructure and composition of the copolyesters were characterized by 1H. NMR and their successful synthesis were corroborated. DSC test proved the semi-crystalline nature of copolymers and corroborated the crystallinity decrement with branching. The crystallinity decreased by 30–47%, when long-chain branches were formed in PBEST. Interestingly, no secondary crystallization was observed using the Avrami model. Furthermore, the Avrami exponent was in the range of 2.5–4.5, signifying a 3D-crystal growth. According to the shear viscosity measurement, the branched copolymers revealed more shear thinning behavior compared to their linear counterparts, and according to the elongational viscosity measurement, the PER branched copolymer displayed a stronger strain hardening response compared to its linear and TMA branched counterparts. Moreover, the shear modulus was raised by two orders of magnitude with branching. Having higher entanglement and less mobility, the long-chain branched copolyesters displayed longer relaxation times compared to their linear counterpart. Despite the outstanding feature of the TMA, its inclusion more than 0.4% (per mol) was not possible due to its declining effect on copolymer extensibility.
{"title":"Long-chain branched copolyesters based on butylene succinate and ethylene terephthalate: synthesis, characterization, thermal and rheological properties","authors":"Rezvene Nayeb Abbasi, Mehdi Rafizadeh","doi":"10.1007/s13726-024-01358-x","DOIUrl":"https://doi.org/10.1007/s13726-024-01358-x","url":null,"abstract":"<p>The introduction of long-chain branches can significantly increase the melt strength and processability of the polyesters. Hence, in the present study, a number of long-chain branched copolyesters were synthesized and the effect of branching agent on the properties of copolyesters was examined. Pentaerythritol (PER) and trimellitic anhydride (TMA) were used as branching agents for the synthesis of poly(butylene succinate-<i>co</i>-ethylene terephthalate) (PBSET). Microstructure and composition of the copolyesters were characterized by <sup>1</sup>H. NMR and their successful synthesis were corroborated. DSC test proved the semi-crystalline nature of copolymers and corroborated the crystallinity decrement with branching. The crystallinity decreased by 30–47%, when long-chain branches were formed in PBEST. Interestingly, no secondary crystallization was observed using the Avrami model. Furthermore, the Avrami exponent was in the range of 2.5–4.5, signifying a 3D-crystal growth. According to the shear viscosity measurement, the branched copolymers revealed more shear thinning behavior compared to their linear counterparts, and according to the elongational viscosity measurement, the PER branched copolymer displayed a stronger strain hardening response compared to its linear and TMA branched counterparts. Moreover, the shear modulus was raised by two orders of magnitude with branching. Having higher entanglement and less mobility, the long-chain branched copolyesters displayed longer relaxation times compared to their linear counterpart. Despite the outstanding feature of the TMA, its inclusion more than 0.4% (per mol) was not possible due to its declining effect on copolymer extensibility.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141941259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-03DOI: 10.1007/s13726-024-01365-y
Maziyar Sabet
Biodegradable polymer composites (BPCs) emerge as a promising solution to the escalating plastics pollution crisis. This review comprehensively analyzes their multifaceted properties, including mechanical strength, gas barrier function, and biodegradation rates, emphasizing their potential for tailored applications in food, beverage, and pharmaceutical packaging. By delving into the optimization of BPC characteristics, we illustrate how these materials can enhance product integrity and extend shelf life, crucial for maintaining the quality and safety of packaged goods. Scalable and cost-effective manufacturing techniques are critically examined, aiming to bridge the gap toward commercial viability and widespread adoption of BPCs. Beyond biodegradability, the adherence to stringent environmental standards is emphasized, promoting a circular economy within packaging through material recovery and reintegration processes. Life cycle assessment (LCA) studies are incorporated to provide a holistic environmental perspective, evaluating the overall impact of BPCs from production to disposal. Industry perspectives are integrated to assess the economic feasibility of BPC adoption across diverse sectors, analyzing potential cost benefits and challenges in integrating BPCs into existing production lines. Finally, the evolving regulatory landscape surrounding BPCs is addressed, highlighting both challenges and opportunities for their widespread adoption. This comprehensive analysis serves as a valuable resource for industry and academia, advocating for BPCs as a crucial step toward a sustainable future for packaging, combining environmental responsibility with practical application.
{"title":"Exploring biodegradable polymer composites for sustainable packaging: a review on properties, manufacturing techniques, and environmental impacts","authors":"Maziyar Sabet","doi":"10.1007/s13726-024-01365-y","DOIUrl":"https://doi.org/10.1007/s13726-024-01365-y","url":null,"abstract":"<p>Biodegradable polymer composites (BPCs) emerge as a promising solution to the escalating plastics pollution crisis. This review comprehensively analyzes their multifaceted properties, including mechanical strength, gas barrier function, and biodegradation rates, emphasizing their potential for tailored applications in food, beverage, and pharmaceutical packaging. By delving into the optimization of BPC characteristics, we illustrate how these materials can enhance product integrity and extend shelf life, crucial for maintaining the quality and safety of packaged goods. Scalable and cost-effective manufacturing techniques are critically examined, aiming to bridge the gap toward commercial viability and widespread adoption of BPCs. Beyond biodegradability, the adherence to stringent environmental standards is emphasized, promoting a circular economy within packaging through material recovery and reintegration processes. Life cycle assessment (LCA) studies are incorporated to provide a holistic environmental perspective, evaluating the overall impact of BPCs from production to disposal. Industry perspectives are integrated to assess the economic feasibility of BPC adoption across diverse sectors, analyzing potential cost benefits and challenges in integrating BPCs into existing production lines. Finally, the evolving regulatory landscape surrounding BPCs is addressed, highlighting both challenges and opportunities for their widespread adoption. This comprehensive analysis serves as a valuable resource for industry and academia, advocating for BPCs as a crucial step toward a sustainable future for packaging, combining environmental responsibility with practical application.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141941261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-27DOI: 10.1007/s13726-024-01360-3
J. G. Martínez-Colunga, V. J. Cruz-Delgado, S. Sánchez-Valdés, J. M. Mata-Padilla, L. F. Ramos-de Valle, A. B. Espinoza-Martínez, R. Benavides, E. Ramírez-Vargas, J. A. Rodriguez-Gonzalez, J. F. Lara-Sanchez, T. Lozano-Ramirez
The effects of ultrasound on the chemical structure of polypropylene (PP) and its composites with different MWCNT content were investigated. The PP composites with 0%, 1%, 3%, and 5% (by weight) MWCNT were extruded using a traditional single-screw extruder and immediately US irradiated in a static mixer. The chemical structure of PP was characterized by using FTIR, DSC, TGA, and GPC to determine any changes caused by the ultrasound, and the MWCNT structure by scanning electron microscopy (SEM). The PP/MWCNT composites were characterized using Raman spectroscopy, DSC, TGA, and SEM, and tested for tensile properties, thermal stability, and electrical and thermal conductivity. The results showed that ultrasonic irradiation caused a slight oxidation in the PP structure and a 13% reduction in its molecular weight. An increase in PP crystallinity, attributed to the improved nucleating effect of the nanotubes, was also observed as a consequence of ultrasonic irradiation. The sonicated PP/MWCNT composites exhibited better dispersion of nanotubes within the PP matrix, resulting in a 30% increment in the elasticity modulus, 45 °C higher for thermal decomposition, an 11 orders of magnitude enhanced volume resistivity, and a 25% increment in thermal conductivity. Furthermore, the SEM results showed that the MWCNT structure was maintained during processing, thanks to the low shear stresses provided by the single-screw extruder, but keeping dispersion with the ultrasonic static mixer.
{"title":"Application of ultrasonic radiation for the development of polypropylene/multi-walled carbon nanotubes nanocomposites and its effect on the PP chemical degradation","authors":"J. G. Martínez-Colunga, V. J. Cruz-Delgado, S. Sánchez-Valdés, J. M. Mata-Padilla, L. F. Ramos-de Valle, A. B. Espinoza-Martínez, R. Benavides, E. Ramírez-Vargas, J. A. Rodriguez-Gonzalez, J. F. Lara-Sanchez, T. Lozano-Ramirez","doi":"10.1007/s13726-024-01360-3","DOIUrl":"https://doi.org/10.1007/s13726-024-01360-3","url":null,"abstract":"<p>The effects of ultrasound on the chemical structure of polypropylene (PP) and its composites with different MWCNT content were investigated. The PP composites with 0%, 1%, 3%, and 5% (by weight) MWCNT were extruded using a traditional single-screw extruder and immediately US irradiated in a static mixer. The chemical structure of PP was characterized by using FTIR, DSC, TGA, and GPC to determine any changes caused by the ultrasound, and the MWCNT structure by scanning electron microscopy (SEM). The PP/MWCNT composites were characterized using Raman spectroscopy, DSC, TGA, and SEM, and tested for tensile properties, thermal stability, and electrical and thermal conductivity. The results showed that ultrasonic irradiation caused a slight oxidation in the PP structure and a 13% reduction in its molecular weight. An increase in PP crystallinity, attributed to the improved nucleating effect of the nanotubes, was also observed as a consequence of ultrasonic irradiation. The sonicated PP/MWCNT composites exhibited better dispersion of nanotubes within the PP matrix, resulting in a 30% increment in the elasticity modulus, 45 °C higher for thermal decomposition, an 11 orders of magnitude enhanced volume resistivity, and a 25% increment in thermal conductivity. Furthermore, the SEM results showed that the MWCNT structure was maintained during processing, thanks to the low shear stresses provided by the single-screw extruder, but keeping dispersion with the ultrasonic static mixer.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141770787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hybrid nanocomposites have been synthesized utilizing epoxy (E) and varying weight percentages of carbon nanotube (CNT), exfoliated graphite (EG), boron nitride (BN), and graphene (GR) as fillers. The incorporation of these nanofillers into the epoxy matrix led to significant enhancement in mechanical and thermal properties of the matrix polymer. Two specific nanocomposite formulations were optimized, one comprising 0.2% (by weight) CNT and 0.3% (by weight) BN (E/CNT1/BN2), and the other comprising 0.2% (by weight) CNT and 0.5% (by weight) EG (E/CNT1/EG3). These formulations demonstrated optimized mechanical properties like impact strength, tensile strength, thermal conductivity, and flexural strength with values of 31.46 ± 4 kJ/m2, 50.35 ± 4 MPa, 0.201 W/(mK), and 97.57 ± 3 MPa in case of E/CNT1/EG3, and 37.19 ± 3 kJ/m2, 54.59 ± 5 MPa, 0.224 W/(mK), and 116.37 ± 6 MPa for E/CNT1/BN2 nanocomposite. The incorporation of fillers also resulted in notable enhancements in thermal properties, as evidenced from differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA) results. The structural and morphological properties of the nanocomposite were analyzed using scanning electron microscopy (SEM). Furthermore, flame properties of the optimized composite were investigated through cone calorimetry tests while the corresponding char residue was analyzed by employing SEM.
{"title":"An optimized hybrid graphite/boron nitride polymer nanocomposite: enhancement in characteristic properties","authors":"Debamita Mohanty, Smita Mohanty, Debmalya Roy, Sakti Ranjan Acharya, Arun Kumar","doi":"10.1007/s13726-024-01361-2","DOIUrl":"https://doi.org/10.1007/s13726-024-01361-2","url":null,"abstract":"<p>Hybrid nanocomposites have been synthesized utilizing epoxy (E) and varying weight percentages of carbon nanotube (CNT), exfoliated graphite (EG), boron nitride (BN), and graphene (GR) as fillers. The incorporation of these nanofillers into the epoxy matrix led to significant enhancement in mechanical and thermal properties of the matrix polymer. Two specific nanocomposite formulations were optimized, one comprising 0.2% (by weight) CNT and 0.3% (by weight) BN (E/CNT<sub>1</sub>/BN<sub>2</sub>), and the other comprising 0.2% (by weight) CNT and 0.5% (by weight) EG (E/CNT<sub>1</sub>/EG<sub>3</sub>). These formulations demonstrated optimized mechanical properties like impact strength, tensile strength, thermal conductivity, and flexural strength with values of 31.46 ± 4 kJ/m<sup>2</sup>, 50.35 ± 4 MPa, 0.201 W/(mK), and 97.57 ± 3 MPa in case of E/CNT<sub>1</sub>/EG<sub>3</sub>, and 37.19 ± 3 kJ/m<sup>2</sup>, 54.59 ± 5 MPa, 0.224 W/(mK), and 116.37 ± 6 MPa for E/CNT<sub>1</sub>/BN<sub>2</sub> nanocomposite. The incorporation of fillers also resulted in notable enhancements in thermal properties, as evidenced from differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA) results. The structural and morphological properties of the nanocomposite were analyzed using scanning electron microscopy (SEM). Furthermore, flame properties of the optimized composite were investigated through cone calorimetry tests while the corresponding char residue was analyzed by employing SEM.</p><h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\u0000","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141770793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-23DOI: 10.1007/s13726-024-01347-0
Fatemeh Zamani, Mohammad Amani-Tehran
Due to the importance of electrospun nanofibrous scaffolds in tissue engineering to regenerate and repair nerve injuries, the main purpose of this study is to present an optimized physical structure of poly(lactic-co-glycolic acid) (PLGA) nanofibrous scaffold as a biodegradable polymer that can increase nerve cells’ growth and proliferation. The effect of each scaffold property on the proliferation of the cells is assessed by estimating and modeling the rate of cell proliferation based on the scaffold’s structural characteristics, and the cell growth behavior is analyzed considering the changes in physical properties. Also, a statistical model is presented to estimate and optimize the number of proliferated cells by simultaneously considering the most effective electrospinning parameters related to the scaffold’s physical structure, utilizing the response surface methodology. The obtained results introduce the scaffold and fiber’s porosity as the most important scaffold property on cell growth enhancement. The optimal amounts of initial properties are 3% (w/v) and 2.5 m/s for solution concentration, and the collector linear velocity, respectively, based on the designed model, as well as the amount of the optimum estimated results is 1.359, which did not have a significant difference with the experimental results of these points. The scaffold suggested by the model had proper fiber alignment and diameter, providing the most optimal structure, adhesion, and cell proliferation in the desired direction by generating optimum porosity and hydrophilicity.
{"title":"Estimation and optimization of nerve cells’ proliferation on electrospun nanofibrous scaffolds","authors":"Fatemeh Zamani, Mohammad Amani-Tehran","doi":"10.1007/s13726-024-01347-0","DOIUrl":"https://doi.org/10.1007/s13726-024-01347-0","url":null,"abstract":"<p>Due to the importance of electrospun nanofibrous scaffolds in tissue engineering to regenerate and repair nerve injuries, the main purpose of this study is to present an optimized physical structure of poly(lactic-<i>co</i>-glycolic acid) (PLGA) nanofibrous scaffold as a biodegradable polymer that can increase nerve cells’ growth and proliferation. The effect of each scaffold property on the proliferation of the cells is assessed by estimating and modeling the rate of cell proliferation based on the scaffold’s structural characteristics, and the cell growth behavior is analyzed considering the changes in physical properties. Also, a statistical model is presented to estimate and optimize the number of proliferated cells by simultaneously considering the most effective electrospinning parameters related to the scaffold’s physical structure, utilizing the response surface methodology. The obtained results introduce the scaffold and fiber’s porosity as the most important scaffold property on cell growth enhancement. The optimal amounts of initial properties are 3% (w/v) and 2.5 m/s for solution concentration, and the collector linear velocity, respectively, based on the designed model, as well as the amount of the optimum estimated results is 1.359, which did not have a significant difference with the experimental results of these points. The scaffold suggested by the model had proper fiber alignment and diameter, providing the most optimal structure, adhesion, and cell proliferation in the desired direction by generating optimum porosity and hydrophilicity.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141785019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-22DOI: 10.1007/s13726-024-01362-1
Nasrollah Majidian, Mahyar Saleh, Mohammad Samipourgiri
The present study investigates the kinetics of polystyrene catalytic pyrolysis using the response surface method. Polystyrene is one of the most widely used polymers that decomposes slowly in the environment. Two models (nth-order reaction and first-order reaction) have been employed to examine the catalytic pyrolysis process. One-liter hydrothermal reactor is filled with 100 g of polystyrene granules that have an estimated diameter of 1 mm and an Iranian natural zeolite catalyst. 100 mL of n-hexane and the catalyst are added to the reactor for improved mixing and to stop the catalyst particles from escaping. Then, the reactor is sealed and when the polymer melts down, nitrogen gas is injected with a flow rate of 100 mL/min. Three variables of time (30–120 min), temperature (100–300 °C), and the amount of catalyst (2, 4, 6 g) were selected as independent variables. For statistical analysis, the second-order model (response surface methodology) was used to find the relationship between independent and dependent variables. The results have shown that temperature and time have a significant effect on pyrolysis efficiency and the Group Method of Data Handling neural network was used to investigate the effect of parameters such as time, temperature, amount of catalyst, polystyrene amount, and pyrolysis mass volume. The findings illustrated that temperature has the greatest effect on the pyrolysis product and the results of kinetic investigation have shown that the nth-order reaction is more suitable for the kinetic justification of all experimental data because the degree of compatibility between experimental data and modeling results is higher than the first-order reaction.
{"title":"Kinetics study of catalytic pyrolysis of polystyrene polymer using response surface method","authors":"Nasrollah Majidian, Mahyar Saleh, Mohammad Samipourgiri","doi":"10.1007/s13726-024-01362-1","DOIUrl":"https://doi.org/10.1007/s13726-024-01362-1","url":null,"abstract":"<p>The present study investigates the kinetics of polystyrene catalytic pyrolysis using the response surface method. Polystyrene is one of the most widely used polymers that decomposes slowly in the environment. Two models (nth-order reaction and first-order reaction) have been employed to examine the catalytic pyrolysis process. One-liter hydrothermal reactor is filled with 100 g of polystyrene granules that have an estimated diameter of 1 mm and an Iranian natural zeolite catalyst. 100 mL of <i>n</i>-hexane and the catalyst are added to the reactor for improved mixing and to stop the catalyst particles from escaping. Then, the reactor is sealed and when the polymer melts down, nitrogen gas is injected with a flow rate of 100 mL/min. Three variables of time (30–120 min), temperature (100–300 °C), and the amount of catalyst (2, 4, 6 g) were selected as independent variables. For statistical analysis, the second-order model (response surface methodology) was used to find the relationship between independent and dependent variables. The results have shown that temperature and time have a significant effect on pyrolysis efficiency and the Group Method of Data Handling neural network was used to investigate the effect of parameters such as time, temperature, amount of catalyst, polystyrene amount, and pyrolysis mass volume. The findings illustrated that temperature has the greatest effect on the pyrolysis product and the results of kinetic investigation have shown that the nth-order reaction is more suitable for the kinetic justification of all experimental data because the degree of compatibility between experimental data and modeling results is higher than the first-order reaction.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141742488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study delves into the exploration of zinc lanthanum layered double hydroxides (Zn–La-LDHs) and zinc aluminum lanthanum layered double hydroxides (Zn–Al–La-LDHs) as potential thermal stabilizers for poly(vinyl chloride) (PVC). The investigation aims to elucidate the synergistic effects of the above rare-earth (RE) LDHs in combination with dibenzoylmethane (β-diketone), pentaerythritol (PE), and other commonly employed heat stabilizers on PVC’s crucial properties, including thermal stability, plasticization, and mechanical strength. The experimental findings demonstrated notable enhancements in PVC’s thermal stability upon incorporation of RE-LDHs, β-diketone, and PE. This enhancement is attributed to the ability of RE-LDHs to effectively hinder degradation reactions within the PVC matrix, thereby increasing its degradation activation energy and overall stability. Moreover, the integration of RE-LDHs contributes significantly to improving PVC’s plasticization and mechanical properties, rendering it suitable for a diverse range of applications. While both Zn–La-LDHs and Zn–Al–La-LDHs exhibited good thermal stability, Zn–La-LDHs demonstrated slightly inferior performance compared to Zn–Al–La-LDHs. This distinction underscores the importance of considering the specific characteristics of each LDHs compound when formulating PVC stabilizer systems. Furthermore, this study highlights the potential of RE-LDHs as eco-friendly alternatives to traditional PVC stabilizers, offering opportunities to develop sustainable stabilizer formulations that address environmental concerns associated with conventional stabilizers. In conclusion, the synthesis and application of RE-LDHs represent a significant advancement in PVC stabilization technology, providing a viable and environmentally conscious approach to enhancing the performance and longevity of PVC-based materials.
{"title":"Preparation of rare-earth LDHs stabilizers and their effects on the thermal stability of poly(vinyl chloride)","authors":"Peijie Jia, Jinsheng Duan, Zhaogang Liu, Yilin Li, Guifang Du, Yanhong Hu, Jinxiu Wu","doi":"10.1007/s13726-024-01363-0","DOIUrl":"https://doi.org/10.1007/s13726-024-01363-0","url":null,"abstract":"<p>This study delves into the exploration of zinc lanthanum layered double hydroxides (Zn–La-LDHs) and zinc aluminum lanthanum layered double hydroxides (Zn–Al–La-LDHs) as potential thermal stabilizers for poly(vinyl chloride) (PVC). The investigation aims to elucidate the synergistic effects of the above rare-earth (RE) LDHs in combination with dibenzoylmethane (β-diketone), pentaerythritol (PE), and other commonly employed heat stabilizers on PVC’s crucial properties, including thermal stability, plasticization, and mechanical strength. The experimental findings demonstrated notable enhancements in PVC’s thermal stability upon incorporation of RE-LDHs, β-diketone, and PE. This enhancement is attributed to the ability of RE-LDHs to effectively hinder degradation reactions within the PVC matrix, thereby increasing its degradation activation energy and overall stability. Moreover, the integration of RE-LDHs contributes significantly to improving PVC’s plasticization and mechanical properties, rendering it suitable for a diverse range of applications. While both Zn–La-LDHs and Zn–Al–La-LDHs exhibited good thermal stability, Zn–La-LDHs demonstrated slightly inferior performance compared to Zn–Al–La-LDHs. This distinction underscores the importance of considering the specific characteristics of each LDHs compound when formulating PVC stabilizer systems. Furthermore, this study highlights the potential of RE-LDHs as eco-friendly alternatives to traditional PVC stabilizers, offering opportunities to develop sustainable stabilizer formulations that address environmental concerns associated with conventional stabilizers. In conclusion, the synthesis and application of RE-LDHs represent a significant advancement in PVC stabilization technology, providing a viable and environmentally conscious approach to enhancing the performance and longevity of PVC-based materials.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141742691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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