The search for novel antibiotic-loaded biomaterials that support the management of osteomyelitis has been extensive in current years. This study developed multifunctional hydrogel to enhance the performance of osteo-conduction and antimicrobial as supporting implant materials for osteomyelitis treatment and prevention. Ciprofloxacin-loaded thermosensitive hydrogels composed of silk fibroin and poloxamers were prepared using the cold method. F1, F2, and F3 formulations resulted in gelation time of within 3 min under 37°C. Physical evaluation showed that the formulations, especially F3, had a proper swelling ratio and 82.34% biodegradability within 14 days. Ciprofloxacin from formulations exhibited an initial burst release within 24 h and continuous delivery, with more than 84% release over 14 days. Released antibiotics showed efficacy against Staphylococcus aureus ATCC25923 and eradicating activity against biofilms. Moreover, hydrogels had no cytotoxic effect on MC3T3-E1 cells with 93–106% cell viability. This multifunctional hydrogel showed a promising approach for supporting osteomyelitis treatment and prevention.
{"title":"Multifunctional hydrogel based on silk fibroin/thermosensitive polymers supporting implant biomaterials in osteomyelitis","authors":"Chayanee Noosak, Pavarish Jantorn, Jutakan Thonglam, Chaiwat Chuaychoosakoon, Jirut Meesane, Dennapa Saeloh Sotthibandhu","doi":"10.1515/epoly-2023-0156","DOIUrl":"https://doi.org/10.1515/epoly-2023-0156","url":null,"abstract":"The search for novel antibiotic-loaded biomaterials that support the management of osteomyelitis has been extensive in current years. This study developed multifunctional hydrogel to enhance the performance of osteo-conduction and antimicrobial as supporting implant materials for osteomyelitis treatment and prevention. Ciprofloxacin-loaded thermosensitive hydrogels composed of silk fibroin and poloxamers were prepared using the cold method. F1, F2, and F3 formulations resulted in gelation time of within 3 min under 37°C. Physical evaluation showed that the formulations, especially F3, had a proper swelling ratio and 82.34% biodegradability within 14 days. Ciprofloxacin from formulations exhibited an initial burst release within 24 h and continuous delivery, with more than 84% release over 14 days. Released antibiotics showed efficacy against <jats:italic>Staphylococcus aureus</jats:italic> ATCC25923 and eradicating activity against biofilms. Moreover, hydrogels had no cytotoxic effect on MC3T3-E1 cells with 93–106% cell viability. This multifunctional hydrogel showed a promising approach for supporting osteomyelitis treatment and prevention.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"8 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140127686","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}
Ze Wang, Yu Li, Jiahao Ren, Yangkai Xiong, Zheng Li, Guoqing Wang
The growth of marine economy urgently needs non-toxic coatings. This study provides a novel and green coating that obtains outstanding antifouling performance by combining the low surface energy effect and the fluorescent effect. The coating was synthesized by reacting tetraphenylethylene (TPE) as the fluorescent component with poly(ethylene-co-tetrafluoroethylene) resin. The introduction of TPE provided the resin coating with lower surface energy and fluorescent properties, leading to improve the antifouling performance. This study indicates fluorescent TPE polymers for marine antifouling and opens new horizons for the exploitation of fluorescent antifouling coatings.
{"title":"Marine antifouling coating based on fluorescent-modified poly(ethylene-co-tetrafluoroethylene) resin","authors":"Ze Wang, Yu Li, Jiahao Ren, Yangkai Xiong, Zheng Li, Guoqing Wang","doi":"10.1515/epoly-2023-0130","DOIUrl":"https://doi.org/10.1515/epoly-2023-0130","url":null,"abstract":"The growth of marine economy urgently needs non-toxic coatings. This study provides a novel and green coating that obtains outstanding antifouling performance by combining the low surface energy effect and the fluorescent effect. The coating was synthesized by reacting tetraphenylethylene (TPE) as the fluorescent component with poly(ethylene-<jats:italic>co</jats:italic>-tetrafluoroethylene) resin. The introduction of TPE provided the resin coating with lower surface energy and fluorescent properties, leading to improve the antifouling performance. This study indicates fluorescent TPE polymers for marine antifouling and opens new horizons for the exploitation of fluorescent antifouling coatings.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"29 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140127712","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}
Xiaoying Cheng, Qiuhui Liao, Jiani Xu, Zeen Gu, Yibo He
This work investigated the mechanical properties of polyethylene terephthalate (PET) reinforced with calcium carbonate (CaCO3) and silica (SiO2) nanoparticles, respectively, and the improvement in toughness of the ternary system with the incorporation of graft-modified ethylene-1-octene copolymer (POE-g-GMA). PET nanocomposites were prepared by melt blending extrusion and injection molding. Molecular dynamics (MD) simulation was employed to construct models for binary system filled with nanoparticles and ternary system with the additional inclusion of POE-g-GMA elastomers. The results of mechanical property tests and MD simulation revealed that the binary system exhibited increased elastic modulus and tensile strength, mainly attributed to the effective reinforcement of rigid nanoparticles and the surface adsorption between nanoparticles and the PET matrix enhanced the interfacial interactions. CaCO3 indicated a more pronounced reinforcing effect, possibly due to the higher crystallinity of its composites. The incorporation of POE-g-GMA resulted in a significant improvement in impact strength and the elongation at break of PET nanocomposites. This enhancement in toughness is attributed to the elastomer’s ability to absorb a substantial amount of impact energy, while the elastic modulus is higher than that of pure PET.
{"title":"Molecular dynamics simulation and experimental study on the mechanical properties of PET nanocomposites filled with CaCO3, SiO2, and POE-g-GMA","authors":"Xiaoying Cheng, Qiuhui Liao, Jiani Xu, Zeen Gu, Yibo He","doi":"10.1515/epoly-2023-0144","DOIUrl":"https://doi.org/10.1515/epoly-2023-0144","url":null,"abstract":"This work investigated the mechanical properties of polyethylene terephthalate (PET) reinforced with calcium carbonate (CaCO<jats:sub>3</jats:sub>) and silica (SiO<jats:sub>2</jats:sub>) nanoparticles, respectively, and the improvement in toughness of the ternary system with the incorporation of graft-modified ethylene-1-octene copolymer (POE-<jats:italic>g</jats:italic>-GMA). PET nanocomposites were prepared by melt blending extrusion and injection molding. Molecular dynamics (MD) simulation was employed to construct models for binary system filled with nanoparticles and ternary system with the additional inclusion of POE-<jats:italic>g</jats:italic>-GMA elastomers. The results of mechanical property tests and MD simulation revealed that the binary system exhibited increased elastic modulus and tensile strength, mainly attributed to the effective reinforcement of rigid nanoparticles and the surface adsorption between nanoparticles and the PET matrix enhanced the interfacial interactions. CaCO<jats:sub>3</jats:sub> indicated a more pronounced reinforcing effect, possibly due to the higher crystallinity of its composites. The incorporation of POE-<jats:italic>g</jats:italic>-GMA resulted in a significant improvement in impact strength and the elongation at break of PET nanocomposites. This enhancement in toughness is attributed to the elastomer’s ability to absorb a substantial amount of impact energy, while the elastic modulus is higher than that of pure PET.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"112 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140127685","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}
Poly(3,4-ethylenedioxythiophene) (PEDOT) is introduced on the surface of a metal–organic framework material by solvothermal method to prepare nanorods (TE@Zn-MOFs) with both flame retardant and thermoelectric properties. Data from cone calorimeter and TG-IR show that TE@Zn-MOFs effectively improves the flame retardant and smoke suppression properties of epoxy-based coatings. At a high TE@Zn-MOFs content of 10 wt%, the coating oxygen index increased from 18.2% to 29.0%, the total smoke release decreased from 25.26 to 22.60 m2, and the V-0 level was achieved in vertical combustion classification. Moreover, PEDOT enables epoxy-based coatings to output a certain current value at different heating temperatures (50–200°C). This work demonstrates that MOFs with flexible and variable structures can serve as effective flame retardants for epoxy-based coatings and endow coatings with fire warning characteristics, providing a way to develop multifunctional coatings for different application scenarios.
{"title":"Flame-retardant thermoelectric responsive coating based on poly(3,4-ethylenedioxythiphene) modified metal–organic frameworks","authors":"Guorong Wang, Zhiyuan Mei, Yu Li, Zhaoyi Sun, Guotao Chen","doi":"10.1515/epoly-2023-0138","DOIUrl":"https://doi.org/10.1515/epoly-2023-0138","url":null,"abstract":"Poly(3,4-ethylenedioxythiophene) (PEDOT) is introduced on the surface of a metal–organic framework material by solvothermal method to prepare nanorods (TE@Zn-MOFs) with both flame retardant and thermoelectric properties. Data from cone calorimeter and TG-IR show that TE@Zn-MOFs effectively improves the flame retardant and smoke suppression properties of epoxy-based coatings. At a high TE@Zn-MOFs content of 10 wt%, the coating oxygen index increased from 18.2% to 29.0%, the total smoke release decreased from 25.26 to 22.60 m<jats:sup>2</jats:sup>, and the V-0 level was achieved in vertical combustion classification. Moreover, PEDOT enables epoxy-based coatings to output a certain current value at different heating temperatures (50–200°C). This work demonstrates that MOFs with flexible and variable structures can serve as effective flame retardants for epoxy-based coatings and endow coatings with fire warning characteristics, providing a way to develop multifunctional coatings for different application scenarios.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"69 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140019080","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}
Highly stretchable thermochromic wrapped yarns, which employ elastane filament (EF) as core, stainless steel wire, and thermochromic polyester filament as the first and second winding, was prepared, and the effect of elastane draft upon yarn properties was investigated. It was found that the elastane draft played an essential role in determining the final yarn behavior, and the optimized elastane draft parameter was 2.5 using Technique for Order Preference by Similarity to Ideal Solution. It is a distinctive configuration of yarn’s constituents and the EF draft that are responsible for the exceptional stretchability of yarns, and it showed mechanical robustness following cyclic stretch. Importantly, the yarn exhibited rapid, durable, and reversible color conversion when subjected to cyclic voltage, cyclic abrasion, and alkali. Finally, a flower-shaped pattern was fabricated by embroidering yarn onto an elastic substrate as a proof-of-concept, and no obvious variation of color fidelity was observed during the stretch.
制备了以氨纶长丝（EF）为芯线、不锈钢丝和热致变色聚酯长丝为第一和第二绕组的高伸缩热致变色包覆纱线，并研究了氨纶牵伸对纱线性能的影响。研究发现，氨纶牵伸在决定最终纱线性能方面起着至关重要的作用，利用与理想解相似的阶次优选技术，将氨纶牵伸参数优化为 2.5。纱线成分的独特配置和 EF 牵伸是纱线具有优异拉伸性的原因，并且在循环拉伸后表现出机械坚固性。重要的是，这种纱线在受到循环电压、循环磨损和碱的作用时，表现出快速、持久和可逆的颜色转换。最后，作为概念验证，通过在弹性基底上刺绣纱线来制作花形图案，在拉伸过程中未观察到明显的色彩保真度变化。
{"title":"Highly stretchable, durable, and reversibly thermochromic wrapped yarns induced by Joule heating: With an emphasis on parametric study of elastane drafts","authors":"Yong Wang, Lizheng Zhang, Mingkun Qi, Zihan Yuan, Mingwei Li, Wei Wang, Changlong Li, Malik Yonis Hassan Saty","doi":"10.1515/epoly-2023-0189","DOIUrl":"https://doi.org/10.1515/epoly-2023-0189","url":null,"abstract":"Highly stretchable thermochromic wrapped yarns, which employ elastane filament (EF) as core, stainless steel wire, and thermochromic polyester filament as the first and second winding, was prepared, and the effect of elastane draft upon yarn properties was investigated. It was found that the elastane draft played an essential role in determining the final yarn behavior, and the optimized elastane draft parameter was 2.5 using Technique for Order Preference by Similarity to Ideal Solution. It is a distinctive configuration of yarn’s constituents and the EF draft that are responsible for the exceptional stretchability of yarns, and it showed mechanical robustness following cyclic stretch. Importantly, the yarn exhibited rapid, durable, and reversible color conversion when subjected to cyclic voltage, cyclic abrasion, and alkali. Finally, a flower-shaped pattern was fabricated by embroidering yarn onto an elastic substrate as a proof-of-concept, and no obvious variation of color fidelity was observed during the stretch.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"55 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140018952","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}
Ning Li, Tianjiao Liu, Mengqi Tian, Junrui Duan, Mu Yao, Runjun Sun
Electromagnetic shielding (EMS) fabric is an effective way to prevent electromagnetic (EM) radiation. However, the research about mechanism analysis of the fabrics’ structure, EM wave (EMW) incident direction, and EMW frequency on the EMS properties of knitted fabrics is discordant at present. Meanwhile, researchers are focused on improving the EMS efficiency of the fabric but rarely discussed the thermal-wet comfort of the fabric. Therefore, in this study a series of weft-knitted fabrics within stainless steel/cotton (30/70) blended yarns were knitted, and the effects of EMW incident direction, stitches, loop lengths, and frequency on EMS effectiveness (EMSE) were analyzed. Meanwhile, the EMS property, warmth retention property, air permeability, moisture permeability, and bursting strength were selected as the evaluation index to evaluate the comprehensive properties of the fabrics by fuzzy mathematics. The results showed that all factors had different degrees of influence on EMSE, and the weft inlay stitch had both the functionality and thermal-wet comfort, which was excellent EMSE in knitted fabric. These results are expected to provide a reference to the design of EMS weft-knitted fabrics.
{"title":"Comprehensive performance evaluation based on electromagnetic shielding properties of the weft-knitted fabrics made by stainless steel/cotton blended yarn","authors":"Ning Li, Tianjiao Liu, Mengqi Tian, Junrui Duan, Mu Yao, Runjun Sun","doi":"10.1515/epoly-2023-0065","DOIUrl":"https://doi.org/10.1515/epoly-2023-0065","url":null,"abstract":"Electromagnetic shielding (EMS) fabric is an effective way to prevent electromagnetic (EM) radiation. However, the research about mechanism analysis of the fabrics’ structure, EM wave (EMW) incident direction, and EMW frequency on the EMS properties of knitted fabrics is discordant at present. Meanwhile, researchers are focused on improving the EMS efficiency of the fabric but rarely discussed the thermal-wet comfort of the fabric. Therefore, in this study a series of weft-knitted fabrics within stainless steel/cotton (30/70) blended yarns were knitted, and the effects of EMW incident direction, stitches, loop lengths, and frequency on EMS effectiveness (EMSE) were analyzed. Meanwhile, the EMS property, warmth retention property, air permeability, moisture permeability, and bursting strength were selected as the evaluation index to evaluate the comprehensive properties of the fabrics by fuzzy mathematics. The results showed that all factors had different degrees of influence on EMSE, and the weft inlay stitch had both the functionality and thermal-wet comfort, which was excellent EMSE in knitted fabric. These results are expected to provide a reference to the design of EMS weft-knitted fabrics.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"102 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140018954","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}
Smart biocompatible materials that respond to a variety of external stimuli have a lot of potential in the creation of low-cost diagnostic biosensors. The present work describes the creation of core–shell nanoparticles as a biosensor for smart enzyme detection of salivary alpha-amylase (sAA). A chitosan-tripolyphosphate core was generated via ionic gelation and was coated with a starch–iodine shell to create biocompatible core–shell nanoparticles. The starch–iodine shell was ruptured in the presence of certain amounts of amylase, exposing the core. This application explains a noticeable color change from blue to white that can be used to identify sAA at the point of care. Synthesized nanoparticles were examined for scanning electron microscopy analysis and energy-dispersive X-ray (EDX). An EDX report reveals that the nanoparticles have higher carbon content at 55% followed by an oxygen atom of 35%. Fourier-transform infrared spectroscopic analysis revealed that the core–shell nanoparticles have carbonyl (C═O) functional groups present. A confirmatory test of amylase reaction on nanoparticle-impregnated paper turns blue to white indicating that the nanoparticle reacts with amylase as an indicator. This paper-based method can be used in future applications in forensic and medical applications.
能对各种外部刺激做出反应的智能生物兼容材料在制造低成本诊断生物传感器方面具有很大潜力。本研究介绍了如何将核壳纳米粒子制成用于唾液α-淀粉酶（sAA）智能酶检测的生物传感器。通过离子凝胶化生成壳聚糖-三聚磷酸酯内核，并在其上包覆一层淀粉-碘外壳，从而制成生物相容性核壳纳米粒子。在一定量的淀粉酶作用下，淀粉-碘外壳破裂，露出核心。这种应用解释了从蓝色到白色的明显颜色变化，可用于在护理点识别 sAA。对合成的纳米颗粒进行了扫描电子显微镜分析和能量色散 X 射线（EDX）检查。EDX 报告显示，纳米颗粒的碳含量较高，为 55%，氧原子含量为 35%。傅立叶变换红外光谱分析显示，核壳纳米粒子含有羰基（C═O）官能团。在纳米粒子浸渍的纸上进行淀粉酶反应的确认测试，结果显示纳米粒子与淀粉酶发生了蓝变白反应。这种基于纸张的方法今后可应用于法医和医疗领域。
{"title":"Development of smart core–shell nanoparticles-based sensors for diagnostics of salivary alpha-amylase in biomedical and forensics","authors":"Kumaravel Kaliaperumal, Kumaran Subramanian, Akshara Seenivasan, Renitta David, Indumathi Mahadevan, Nahaa Miqad Alotaibi, Modhi Obaidan Alotaibi, Nawaf Alshammari, Mohd Saeed","doi":"10.1515/epoly-2023-0051","DOIUrl":"https://doi.org/10.1515/epoly-2023-0051","url":null,"abstract":"Smart biocompatible materials that respond to a variety of external stimuli have a lot of potential in the creation of low-cost diagnostic biosensors. The present work describes the creation of core–shell nanoparticles as a biosensor for smart enzyme detection of salivary alpha-amylase (sAA). A chitosan-tripolyphosphate core was generated via ionic gelation and was coated with a starch–iodine shell to create biocompatible core–shell nanoparticles. The starch–iodine shell was ruptured in the presence of certain amounts of amylase, exposing the core. This application explains a noticeable color change from blue to white that can be used to identify sAA at the point of care. Synthesized nanoparticles were examined for scanning electron microscopy analysis and energy-dispersive X-ray (EDX). An EDX report reveals that the nanoparticles have higher carbon content at 55% followed by an oxygen atom of 35%. Fourier-transform infrared spectroscopic analysis revealed that the core–shell nanoparticles have carbonyl (C═O) functional groups present. A confirmatory test of amylase reaction on nanoparticle-impregnated paper turns blue to white indicating that the nanoparticle reacts with amylase as an indicator. This paper-based method can be used in future applications in forensic and medical applications.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"6 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139558034","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}
Xiaoyu Jie, Bing-Chiuan Shiu, Huazhong Wu, Yuchi Zhang, Yuansong Ye, Chunxiang Lin, Run Fang
Chitosan (CS) is widely used in the treatment of wastewater containing metal ions. However, the poor stability in acidic aqueous solutions severely limits its application in many practical scenarios. In this work, a CS-based composite nanofiber membrane was prepared by electrospinning using urushiol, a natural biomaterial, as the cross-linking agent. The application of the CS-urushiol (CS-U) membrane in the adsorption and recovery of Cr(vi) in wastewater was systematically studied. The CS-U membrane showed great resistance to strongly acidic and oxidative environments, and the adsorption process combined two mechanisms of electrostatic attraction and redox reaction. Due to the nanoscale fibers, porous structure, and strong acid resistance, the CS-U membrane adsorbed Cr(vi) rapidly and efficiently in both batch and continuous modes. Moreover, the adsorption capacity and selectivity of the CS-U membrane for Cr(vi) could be maximized simultaneously by adjusting the solution pH, promoting the recovery of high-purity Cr2O3.
{"title":"Adsorption and recovery of Cr(vi) from wastewater by Chitosan–Urushiol composite nanofiber membrane","authors":"Xiaoyu Jie, Bing-Chiuan Shiu, Huazhong Wu, Yuchi Zhang, Yuansong Ye, Chunxiang Lin, Run Fang","doi":"10.1515/epoly-2023-0157","DOIUrl":"https://doi.org/10.1515/epoly-2023-0157","url":null,"abstract":"Chitosan (CS) is widely used in the treatment of wastewater containing metal ions. However, the poor stability in acidic aqueous solutions severely limits its application in many practical scenarios. In this work, a CS-based composite nanofiber membrane was prepared by electrospinning using urushiol, a natural biomaterial, as the cross-linking agent. The application of the CS-urushiol (CS-U) membrane in the adsorption and recovery of Cr(<jats:sc>vi</jats:sc>) in wastewater was systematically studied. The CS-U membrane showed great resistance to strongly acidic and oxidative environments, and the adsorption process combined two mechanisms of electrostatic attraction and redox reaction. Due to the nanoscale fibers, porous structure, and strong acid resistance, the CS-U membrane adsorbed Cr(<jats:sc>vi</jats:sc>) rapidly and efficiently in both batch and continuous modes. Moreover, the adsorption capacity and selectivity of the CS-U membrane for Cr(<jats:sc>vi</jats:sc>) could be maximized simultaneously by adjusting the solution pH, promoting the recovery of high-purity Cr<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"1 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139376202","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}
N,N-Di-2-propyn-1-yl-2-furanmethanamine (DPFA) was synthesized from 2-furanemethylamine and 3-chloropropyne. Then, furan-containing polytriazoles were made from DPFA and diazide compounds. The Diels-Alder (DA) reaction between 4,4′-bismaleimidodiphenylmethane and furan-containing polytriazoles was used to prepare recyclable polytriazole resins. The effects of the main chain structures on the reversible processes and mechanical properties of the resins were investigated. The results show that the flexibility of the chain structures could be regulated by introducing different contents of azide-terminated polyethylene glycol (PEG) in the polymerization process. The PEG segments could not only promote the degree of the DA reaction but also play a role in reinforcing and/or toughening the recyclable polytriazole resins. RFPTA-5 resin film displays a tensile strength of 107.2 MPa and RFPTA-20 resin film shows an elongation at break of 224.8%. Moreover, the resin films demonstrate high recyclability.
{"title":"Recyclable polytriazole resins with high performance based on Diels-Alder dynamic covalent crosslinking","authors":"Kejie Heng, Jun Zhang, Caiyun Wang, Keying Wang, Liqiang Wan, Farong Huang","doi":"10.1515/epoly-2023-0119","DOIUrl":"https://doi.org/10.1515/epoly-2023-0119","url":null,"abstract":"<jats:italic>N</jats:italic>,<jats:italic>N</jats:italic>-Di-2-propyn-1-yl-2-furanmethanamine (DPFA) was synthesized from 2-furanemethylamine and 3-chloropropyne. Then, furan-containing polytriazoles were made from DPFA and diazide compounds. The Diels-Alder (DA) reaction between 4,4′-bismaleimidodiphenylmethane and furan-containing polytriazoles was used to prepare recyclable polytriazole resins. The effects of the main chain structures on the reversible processes and mechanical properties of the resins were investigated. The results show that the flexibility of the chain structures could be regulated by introducing different contents of azide-terminated polyethylene glycol (PEG) in the polymerization process. The PEG segments could not only promote the degree of the DA reaction but also play a role in reinforcing and/or toughening the recyclable polytriazole resins. RFPTA-5 resin film displays a tensile strength of 107.2 MPa and RFPTA-20 resin film shows an elongation at break of 224.8%. Moreover, the resin films demonstrate high recyclability.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"4 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139092096","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}
Dalal A. Aloraini, Aljawhara H. Almuqrin, Kawa M. Kaky, M. I. Sayyed, Mohamed Elsafi
The radiation shielding characteristics of the polyester resin composites reinforced with cerium(iv) oxide (CeO2) have been studied. The prepared composites were pure polyester–resin (Poly/CeO2-0), 90% per weight polyester resin and 10% CeO2 (Poly/CeO2-10), (Poly/CeO2-30), (Poly/CeO2-50), and (Poly/CeO2-60). The linear attenuation coefficient (LAC) values for the free polyester and polyester samples with CeO2 were experimentally measured compared with the XCOM data. The experimental LAC value was found to be 0.2377 cm−1 at 0.0595 MeV, which is in good agreement with the calculated value of 0.2454 cm−1. Also, for the same sample, the experimental LAC was found to be 0.1034 cm−1 at 0.662 MeV, showing a good agreement with the calculated value of 0.1057 cm−1. The LAC values for the free polyester, Pol/CeO2-30, and Pol/CeO2-60 are 1.43, 31.82, and 107.77 cm−1 at 0.015 MeV, respectively. The big difference in the LAC values between the composite with 0 and 60% CeO2 is evident. The radiation shielding efficiency (RSE) of the polyester with different amounts of CeO2 was experimentally measured at four energy values. Also, we extended the calculation of RSE at other energy values in the range of 0.015–15 MeV). The exposure buildup factor (EBF) values for the free CeO2 sample and the samples with CeO2 are calculated. The EBF is small at low energies, then increases, and attains a maximum value at moderate energy; the EBF shows a decreasing trend with an increase in the energy.
{"title":"Radiation shielding capability and exposure buildup factor of cerium(iv) oxide-reinforced polyester resins","authors":"Dalal A. Aloraini, Aljawhara H. Almuqrin, Kawa M. Kaky, M. I. Sayyed, Mohamed Elsafi","doi":"10.1515/epoly-2023-0128","DOIUrl":"https://doi.org/10.1515/epoly-2023-0128","url":null,"abstract":"The radiation shielding characteristics of the polyester resin composites reinforced with cerium(<jats:sc>iv</jats:sc>) oxide (CeO<jats:sub>2</jats:sub>) have been studied. The prepared composites were pure polyester–resin (Poly/CeO<jats:sub>2</jats:sub>-0), 90% per weight polyester resin and 10% CeO<jats:sub>2</jats:sub> (Poly/CeO<jats:sub>2</jats:sub>-10), (Poly/CeO<jats:sub>2</jats:sub>-30), (Poly/CeO<jats:sub>2</jats:sub>-50), and (Poly/CeO<jats:sub>2</jats:sub>-60). The linear attenuation coefficient (LAC) values for the free polyester and polyester samples with CeO<jats:sub>2</jats:sub> were experimentally measured compared with the XCOM data. The experimental LAC value was found to be 0.2377 cm<jats:sup>−1</jats:sup> at 0.0595 MeV, which is in good agreement with the calculated value of 0.2454 cm<jats:sup>−1</jats:sup>. Also, for the same sample, the experimental LAC was found to be 0.1034 cm<jats:sup>−1</jats:sup> at 0.662 MeV, showing a good agreement with the calculated value of 0.1057 cm<jats:sup>−1</jats:sup>. The LAC values for the free polyester, Pol/CeO<jats:sub>2</jats:sub>-30, and Pol/CeO<jats:sub>2</jats:sub>-60 are 1.43, 31.82, and 107.77 cm<jats:sup>−1</jats:sup> at 0.015 MeV, respectively. The big difference in the LAC values between the composite with 0 and 60% CeO<jats:sub>2</jats:sub> is evident. The radiation shielding efficiency (RSE) of the polyester with different amounts of CeO<jats:sub>2</jats:sub> was experimentally measured at four energy values. Also, we extended the calculation of RSE at other energy values in the range of 0.015–15 MeV). The exposure buildup factor (EBF) values for the free CeO<jats:sub>2</jats:sub> sample and the samples with CeO<jats:sub>2</jats:sub> are calculated. The EBF is small at low energies, then increases, and attains a maximum value at moderate energy; the EBF shows a decreasing trend with an increase in the energy.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"31 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139066816","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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