European Polymer Journal最新文献_第3页

Vertically anchored nano-fold hybrid on h-BN surfaces achieves effective smoke suppression, antibacterial, and thermal conductivity in epoxy resin composites h-BN 表面垂直锚定的纳米折叠杂化物在环氧树脂复合材料中实现了有效的抑烟、抗菌和导热性能

IF 5.8 2区化学

European Polymer Journal Pub Date : 2024-11-13 DOI: 10.1016/j.eurpolymj.2024.113578

Yutong Huo , Zheng Zhong , Shitong Liu , Shitong Sun , Weiguo Yao , Quanming Li , Yanli Dou

{"title":"Vertically anchored nano-fold hybrid on h-BN surfaces achieves effective smoke suppression, antibacterial, and thermal conductivity in epoxy resin composites","authors":"Yutong Huo , Zheng Zhong , Shitong Liu , Shitong Sun , Weiguo Yao , Quanming Li , Yanli Dou","doi":"10.1016/j.eurpolymj.2024.113578","DOIUrl":"10.1016/j.eurpolymj.2024.113578","url":null,"abstract":"<div><div>Considering the requirement of environmental and bio-friendliness of flame retardants, there is an urgent need to develop efficient flame retardants based on low-toxicity raw materials. Herein, a nano-fold structure DBN@CoMo-LDH was successfully synthesized by combining layered double hydroxides (LDHs) with hexagonal boron nitride (h-BN), through a sacrificial template approach involving ion-exchange interaction at atmospheric pressure. Thanks to the better compatibility and strong interfacial interactions of hybrids in matrix, epoxy resin (EP) composites can exhibit superior flame retardancy and smoke suppression without loss of mechanical properties. The enhancement and mechanism of fire safety of EP composites were investigated through cone calorimetric test, condensed-phase residue analysis, and gas-phase product analysis. Compared to EP, the peak heat release rate (pHRR), peak smoke production rate (pSPR), total smoke production (TSP), carbon monoxide production rate (COP) and carbon dioxide production rate (CO<sub>2</sub>P) of EP/4DBN@CoMo-LDH were reduced by 37.77 %, 62.96 %, 50.45 %, 45.71 % and 40.98 %, respectively. DBN@CoMo-LDH not only promoted the rapid generation of a dense carbon layer, but also effectively suppressed the release of gas phase products. Furthermore, it demonstrates excellent antimicrobial properties against both <em>Staphylococcus aureus</em> and <em>Escherichia coli</em>. Moreover, the unique nano-fold structure can provide a good thermal conduction path in the matrix, improving the thermal conductivity of EP. This study offers a feasible approach for designing high-performance flame retardants, and suggests their potential application in multifunctional EP composites.</div></div>","PeriodicalId":315,"journal":{"name":"European Polymer Journal","volume":"221 ","pages":"Article 113578"},"PeriodicalIF":5.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142703904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pectin/Alginate bio-nanocomposite hydrogel beads based on in-situ formed layered double hydroxide in the presence of Mentha extract: Antibacterial carrier for potential pH-responsive targeted anti-cancer drug delivery 基于薄荷提取物存在下原位形成的层状双氢氧化物的果胶/海藻酸盐生物纳米复合材料水凝胶珠：潜在 pH 响应型靶向抗癌药物递送的抗菌载体

IF 5.8 2区化学

European Polymer Journal Pub Date : 2024-11-13 DOI: 10.1016/j.eurpolymj.2024.113548

Roghayeh Fathi, Siamak Javanbakht, Reza Mohammadi

{"title":"Pectin/Alginate bio-nanocomposite hydrogel beads based on in-situ formed layered double hydroxide in the presence of Mentha extract: Antibacterial carrier for potential pH-responsive targeted anti-cancer drug delivery","authors":"Roghayeh Fathi, Siamak Javanbakht, Reza Mohammadi","doi":"10.1016/j.eurpolymj.2024.113548","DOIUrl":"10.1016/j.eurpolymj.2024.113548","url":null,"abstract":"<div><div>This research presents the creation of novel pH-responsive drug delivery carriers with potential applications in cancer treatment. The study involved the Mentha Extract (ME) for the in-situ synthesis of Layered Double Hydroxide (LDH) bio nanoparticles (LDH-ME NPs). These NPs were incorporated into a biopolymeric hybrid formulation containing Pectin and Alginate to produce bio-nanocomposite hydrogel beads. The morphology and chemical composition were assessed and confirmed through various techniques. Doxorubicin (DOX) was employed as a representative anti-cancer medication to investigate the controlled drug release properties of the newly developed hydrogel beads (loading capacity: ∼92 %). <em>In vitro</em> experiments revealed that the drug release pattern was significantly regulated in response to pH levels (with a higher drug release rate at pH 7.4, about 89 %). The assessment for antibacterial properties validated the effective antibacterial performance of the hydrogel beads toward <em>S. aureus</em> and <em>E. coli</em> with inhibition zones about 20 mm and 14 mm, respectively. MTT assay indicated a high level of cytocompatibility with HT-29 cells (cell viability exceeding 95 %) for the blank bio-nanocomposite hydrogel beads. Conversely, bio-nanocomposite hydrogel beads loaded with DOX exhibited notable cytotoxicity (∼13 % cell viability in 15.6 µg/mL) against HT-29 cells. These findings recommend the current bio-nanocomposite as a promising bio-platform with superior antibacterial and anti-cancer properties.</div></div>","PeriodicalId":315,"journal":{"name":"European Polymer Journal","volume":"221 ","pages":"Article 113548"},"PeriodicalIF":5.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142703905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Soluble polyimides with ultralow dielectric constant and dielectric loss and high colorless transparency based on spirobisindane-bis (aryl ester) diamines 具有超低介电常数、介电损耗和高无色透明度的可溶性聚酰亚胺，基于螺双茚双(芳基酯)二胺

IF 5.8 2区化学

European Polymer Journal Pub Date : 2024-11-13 DOI: 10.1016/j.eurpolymj.2024.113580

Peng Xiao , Xiaojie He , Feng Zheng , Qinghua Lu

{"title":"Soluble polyimides with ultralow dielectric constant and dielectric loss and high colorless transparency based on spirobisindane-bis (aryl ester) diamines","authors":"Peng Xiao , Xiaojie He , Feng Zheng , Qinghua Lu","doi":"10.1016/j.eurpolymj.2024.113580","DOIUrl":"10.1016/j.eurpolymj.2024.113580","url":null,"abstract":"<div><div>With the emergence of 5G technology, the traditional polyimide with a relatively high dielectric constant (<em>D</em><sub>k</sub>) and dielectric loss (<em>D</em><sub>f</sub>) are not suitable the requirements of ultra-high transmission and ultra-low loss. In particular, reducing the <em>D</em><sub>f</sub> value of polyimide has become a significant difficulty in science and engineering. Herein, an elaborate design was proposed for the preparation of polyimide with both low <em>D</em><sub>k</sub> and low <em>D</em><sub>f</sub>, based on a pair of diamine isomer containing two esters and a spiro-bis-indene structure (<em>p</em>-SBI2EA and <em>m</em>-SBI2EA), and their polymerization with 4,4′-(Hexafluoroisopropylidene)diphthalic anhydride (6FDA). The resultant polyimide films showed an exceptional dielectric property, with <em>D</em><sub>k</sub> values of 2.83 and 2.88, and <em>D</em><sub>f</sub> values of 0.0043 and 0.0048 for <em>p</em>-SBI2EA-6FDA and <em>m</em>-SBI2EA-6FDA, respectively, at high frequencies (40 GHz). Interestingly, introducing the spirobisindane structure significantly displayed preeminent solubility in both high-boiling-point and low-boiling-point solvents. Furthermore, the PI films exhibited perfect optical performance, with cutoff wavelengths (<em>λ</em><sub>cut-off</sub>) of 315 and 321 nm, transmittance exceeding 86 % and 89 % at 450 nm, and yellowing indices (YI) as low as 1.72 and 1.63, respectively. The features of the PIs render them auspicious candidate materials for applications in 5G high frequency communication and optical fields.</div></div>","PeriodicalId":315,"journal":{"name":"European Polymer Journal","volume":"221 ","pages":"Article 113580"},"PeriodicalIF":5.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanoresponsive self-reinforcement composite hydrogels with triple-network structures 具有三重网络结构的机械粘弹性自增强复合水凝胶

IF 5.8 2区化学

European Polymer Journal Pub Date : 2024-11-12 DOI: 10.1016/j.eurpolymj.2024.113579

Qing-xin Hu , Ran Liu , Zhao Gao , Yu-yu Zhou , Wen-jing Yan , Jin-min Yao , Ze-min Ma , Yan-ru Xue , Meng Zhang , Yan-qin Wang , Xiao-gang Wu , Qiang Li

{"title":"Mechanoresponsive self-reinforcement composite hydrogels with triple-network structures","authors":"Qing-xin Hu , Ran Liu , Zhao Gao , Yu-yu Zhou , Wen-jing Yan , Jin-min Yao , Ze-min Ma , Yan-ru Xue , Meng Zhang , Yan-qin Wang , Xiao-gang Wu , Qiang Li","doi":"10.1016/j.eurpolymj.2024.113579","DOIUrl":"10.1016/j.eurpolymj.2024.113579","url":null,"abstract":"<div><div>Composite hydrogels featuring multiple-network structures hold immense potential owing to their superior mechanical attributes and exceptional capacity for dissipating energy. Nonetheless, many multiple-network hydrogels lack mechanoresponsive self-reinforcement capabilities, rendering them susceptible to enduring structural fractures. Hence, it exists a critical need to engineer composite hydrogels with both multiple-network structures and mechanoresponsive self-reinforcement abilities. In this study, we devised a triple-network (TN) hydrogel employing poly (2-acrylamido-2-methylpropane sulfonic acid) sodium salt (PNaAMPS) as the first network, which can generate mechanical radicals upon fracture. While polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC)-Al<sup>3+</sup> served as the secondary and tertiary networks, respectively, so that to optimize its mechanical properties effectively. Upon breakage, the fragmented PNaAMPS chains could act as radical initiators, catalyzing the polymerization of the N-isopropyl acrylamide (NIPAM) monomers within the TN hydrogels to form PNIPAM chains. Furthermore, through successive network disruptions and the infusion of NIPAM monomers, the mechanical strength of the triple-network gel could be significantly enhanced. Furthermore, we evaluated the extent of mechanoresponsive self-reinforcement using the fluorochrome 8-Anilino-1-naphthalene sulfonic acid (ANS) as a fluorescent probe. This probe enabled the quantification of the PNIPAM production visually, which provided valuable feedback of the mechanical strength self-reinforcement levels by the fluorescence signals. Our approach set the stage for the development of mechanoresponsive composite hydrogels with fluorescence feedback capabilities for self-reinforcement assessment.</div></div>","PeriodicalId":315,"journal":{"name":"European Polymer Journal","volume":"221 ","pages":"Article 113579"},"PeriodicalIF":5.8,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A one-step polyvinyl alcohol/polyacrylamide/polyacrylic acid/dimethyl sulfoxide/CaCl2 hybrid hydrogel enabling anti-fatigue, anti-freeze and anti-dehydration for wearable strain sensor 一步法聚乙烯醇/聚丙烯酰胺/聚丙烯酸/二甲基亚砜/CaCl2 混合水凝胶，用于可穿戴应变传感器的抗疲劳、抗冻和抗脱水功能

IF 5.8 2区化学

European Polymer Journal Pub Date : 2024-11-10 DOI: 10.1016/j.eurpolymj.2024.113573

Xiangqian Fan , Liyong Wang , Shaomin Bai , Huiqi Wang , Xingcheng Zhu , Lei Liu , Ning Li , Chaorui Xue , Shengliang Hu

{"title":"A one-step polyvinyl alcohol/polyacrylamide/polyacrylic acid/dimethyl sulfoxide/CaCl2 hybrid hydrogel enabling anti-fatigue, anti-freeze and anti-dehydration for wearable strain sensor","authors":"Xiangqian Fan , Liyong Wang , Shaomin Bai , Huiqi Wang , Xingcheng Zhu , Lei Liu , Ning Li , Chaorui Xue , Shengliang Hu","doi":"10.1016/j.eurpolymj.2024.113573","DOIUrl":"10.1016/j.eurpolymj.2024.113573","url":null,"abstract":"<div><div>Hydrogel with fatigue resistance, freezing tolerant and dehydration resistance are peculiarly attractive in strain sensors. The hydrogel soaked in organic solvent is an effective strategy to improve freezing resistance and dehydration resistance, while this may result in poor conductivity. Moreover, ion-incorporation is considered to be the most feasible method for solving above concern, while high concentration of salt ions will result in weak mechanical properties. Therefore, the facile preparation of anti-freezing and anti-dehydration hydrogels with excellent fatigue resistance remains a challenge. Herein, a polyvinyl alcohol/polyacrylamide/polyacrylic acid/dimethyl sulfoxide/CaCl<sub>2</sub> hybrid hydrogel was designed and fabricated through a facile one-step method to balance a variety of outstanding properties. On account of the hybridization design of multi-materials, the hybrid hydrogel exhibited high ionic conductivity (∼0.2 S/m), strength (∼0.36 MPa) and stretchability (∼825 %). Meanwhile, the hybrid hydrogel demonstrated prominent freezing resistance, dehydration resistance and fatigue resistance. The mechanical properties almost no deterioration after 1000 stretching cycle at 100 % strain, exposure to environment for 30 days or freeze at low temperature. Besides, the hybrid hydrogel-based stain sensor showed a linear sensitivity (GF = 1.12 over 0–400 % strain), quickly responsivity (200 ms), and could monitor various human activities steadily, demonstrating distinguished potential for use in wearable health monitoring and flexible electric skins.</div></div>","PeriodicalId":315,"journal":{"name":"European Polymer Journal","volume":"221 ","pages":"Article 113573"},"PeriodicalIF":5.8,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydroxide-ion induced complete mineralization of poly(tetrafluoroethylene-co-hexafluoropropylene) copolymer (FEP) in subcritical water 氢氧离子诱导聚四氟乙烯-共六氟丙烯共聚物（FEP）在亚临界水中完全矿化

IF 5.8 2区化学

European Polymer Journal Pub Date : 2024-11-10 DOI: 10.1016/j.eurpolymj.2024.113575

Hisao Hori , Hisashi Saito , Abdelatif Manseri , Bruno Ameduri

{"title":"Hydroxide-ion induced complete mineralization of poly(tetrafluoroethylene-co-hexafluoropropylene) copolymer (FEP) in subcritical water","authors":"Hisao Hori , Hisashi Saito , Abdelatif Manseri , Bruno Ameduri","doi":"10.1016/j.eurpolymj.2024.113575","DOIUrl":"10.1016/j.eurpolymj.2024.113575","url":null,"abstract":"<div><div>Decomposition of poly(tetrafluoroethylene-<em>co</em>-hexafluoropropylene) copolymer (FEP) in supercritical and subcritical water was investigated with the aim of waste treatment. The efficiency of such decomposition was examined by using either oxidizing agents (O<sub>2</sub>, H<sub>2</sub>O<sub>2</sub>) or an alkaline reagent (KOH). When O<sub>2</sub> was chosen, the highest F<sup>–</sup> and CO<sub>2</sub> yields, 75 % and 64 %, respectively, were obtained from a reaction of FEP in supercritical water at 384 °C for 24 h. Under these conditions, traces of CHF<sub>3</sub> were detected in the gas phase, the amount of which decreased with increasing the reaction time. H<sub>2</sub>O<sub>2</sub> gave slightly higher reactivity than O<sub>2</sub>. In contrast, reactions with KOH induced efficient fluorine mineralization. When FEP reacted in 3.0 M KOH solution at 360 °C for 18 h, the F<sup>–</sup> yield reached 98 %. Hence, complete fluorine mineralization was achieved, where very little CO<sub>2</sub> (∼0% yield) and no CHF<sub>3</sub> were generated in the gas phase. Furthermore,<sup>19</sup>F NMR spectroscopy and combustion-ion chromatography revealed that the reaction solutions did not contain any organofluorine compounds during the reactions. FEP decomposed, releasing F<sup>–</sup> into the reaction solution, resulting in the formation of amorphous carbon in the residue.</div></div>","PeriodicalId":315,"journal":{"name":"European Polymer Journal","volume":"221 ","pages":"Article 113575"},"PeriodicalIF":5.8,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142703906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual physical cross-linking supramolecular hydrogel with self-healing, recyclable and stretchable capabilities as wearable strain sensor for human motion monitoring 具有自修复、可回收和可拉伸功能的双物理交联超分子水凝胶，可作为用于人体运动监测的可穿戴应变传感器

IF 5.8 2区化学

European Polymer Journal Pub Date : 2024-11-10 DOI: 10.1016/j.eurpolymj.2024.113572

Hailan Ren , Shujun Zou , Sijing He, Qinfeng Rong

{"title":"Dual physical cross-linking supramolecular hydrogel with self-healing, recyclable and stretchable capabilities as wearable strain sensor for human motion monitoring","authors":"Hailan Ren , Shujun Zou , Sijing He, Qinfeng Rong","doi":"10.1016/j.eurpolymj.2024.113572","DOIUrl":"10.1016/j.eurpolymj.2024.113572","url":null,"abstract":"<div><div>Hydrogel-based wearable sensors have attracted tremendous attention in the sensing electronics field due to their unique properties. However, it remains a challenge to explore hydrogel-based sensor that can incorporate highly stretchable, self-healing, and recyclable properties simultaneously. In this work, we report a simple approach to fabricate high-performance polymer hydrogels using (3-acrylamidopropyl) trimethylammonium chloride (ATAC), tannic acid (TA) and ferric chloride (FeCl<sub>3</sub>) as raw materials. There were two non-covalent interactions in the network: hydrogen bonding between PATAC and TA, and metal-coordination interaction between TA and FeCl<sub>3</sub>. Excellent mechanical properties were achieved of the PATAC-TA/Fe<sup>3+</sup> hydrogel: fracture strain of 2234 %, fracture stress of 188.57 kPa, and toughness of 2.93 MJ/m<sup>3</sup>. Due to reversibility of the non-covalent cross-linked networks, the self-healing efficiency of the hydrogel could reach 96.62 % after 24 h of contact. At the same time, the stretchability, electrical conductivity, and self-healing property of the damaged hydrogel were recovered after dissolution and drying. Therefore, the strain sensor based on the hydrogel could be used to monitor a variety of human activities in real time, including speech recognition, facial expression recognition and joint bending. With the combination of these outstanding features, such a highly self-healing and recyclable hydrogel through a facile and green preparation process would have great potential application for sustainable wearable sensors.</div></div>","PeriodicalId":315,"journal":{"name":"European Polymer Journal","volume":"221 ","pages":"Article 113572"},"PeriodicalIF":5.8,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Areca nut husk lignocellulosic fibers: A sustainable alternative to synthetic textiles 亚麻仁壳木质纤维：合成纺织品的可持续替代品

IF 5.8 2区化学

European Polymer Journal Pub Date : 2024-11-10 DOI: 10.1016/j.eurpolymj.2024.113531

Özge Süfer , Ayşe Nur Tonay , Yasemin Çelebi , Berrak Delikanlı Kıyak , Azime Özkan Karabacak , Gülşah Çalışkan Koç , Samiye Adal , Seema Ramniwas , Sarvesh Rustagi , Ravi Pandiselvam

{"title":"Areca nut husk lignocellulosic fibers: A sustainable alternative to synthetic textiles","authors":"Özge Süfer , Ayşe Nur Tonay , Yasemin Çelebi , Berrak Delikanlı Kıyak , Azime Özkan Karabacak , Gülşah Çalışkan Koç , Samiye Adal , Seema Ramniwas , Sarvesh Rustagi , Ravi Pandiselvam","doi":"10.1016/j.eurpolymj.2024.113531","DOIUrl":"10.1016/j.eurpolymj.2024.113531","url":null,"abstract":"<div><div>This review paper explores the potential of Areca nut husk fibers as a sustainable alternative to synthetic textiles, focusing on their composition, properties, extraction methods, and applications. Areca nut husk, a lignocellulosic material rich in cellulose, hemicellulose, and lignin, is an abundant agricultural by-product in regions like India. Despite its current underutilization, it exhibits excellent mechanical and thermal properties, making it suitable for diverse applications, including biocomposites, biodegradable packaging, textiles, and construction materials. The review highlights the extraction and processing techniques for optimizing fiber quality, such as alkaline treatment, and discusses the fibers’ advantages, such as renewability, biodegradability, and cost-effectiveness. The environmental impact assessment underscores the ecological benefits of replacing synthetic fibers with Areca nut husk fibers, emphasizing their potential to reduce carbon emissions and waste. While the fibers show promise in multiple industries, the paper also addresses current challenges and the need for further research to fully realize their potential as a green alternative to synthetic fibers.</div></div>","PeriodicalId":315,"journal":{"name":"European Polymer Journal","volume":"221 ","pages":"Article 113531"},"PeriodicalIF":5.8,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

POxylated stereocomplexes from PEtOx-b-PLA diblock copolymers 来自 PEtOx-b-PLA 二嵌段共聚物的 POxylated 立体共聚物

IF 5.8 2区化学

European Polymer Journal Pub Date : 2024-11-09 DOI: 10.1016/j.eurpolymj.2024.113545

Leanne M. Stafast , Martin Swieczkowski , Purushottam Poudel , Nora Engel , Chuan Yin , Karl Scheuer , Christine Weber , Felix H. Schacher , Klaus D. Jandt , Ulrich S. Schubert

{"title":"POxylated stereocomplexes from PEtOx-b-PLA diblock copolymers","authors":"Leanne M. Stafast , Martin Swieczkowski , Purushottam Poudel , Nora Engel , Chuan Yin , Karl Scheuer , Christine Weber , Felix H. Schacher , Klaus D. Jandt , Ulrich S. Schubert","doi":"10.1016/j.eurpolymj.2024.113545","DOIUrl":"10.1016/j.eurpolymj.2024.113545","url":null,"abstract":"<div><div>An ω-hydroxyl terminated poly(2-ethyl-2-oxazoline) (PEtOx) was obtained by termination of the cationic ring-opening polymerization of 2-ethyl-2-oxazoline with acetate and subsequent transesterification with methanol. The resulting PEtOx-OH featuring a degree of polymerization (DP) of 18 was used as a macroinitiator for the ring-opening polymerization of <span>l</span>-lactide as well as <span>d</span>-lactide. The resulting PEtOx-<em>b</em>-PLA block copolymers featured DP values of 25, 50, 100, and 150, respectively, and were characterized by means of size exclusion chromatography, <sup>1</sup>H NMR spectroscopy as well as matrix-assisted laser desorption ionization mass spectrometry. Differential scanning calorimetry, wide-angle x-ray scattering and polarized light microscopy indicated the formation of stereocomplexes in racemic blends of PEtOx-<em>b</em>-PLA with opposing chirality. Thereby, the amorphous PEtOx block did not affect the modification of the stereocomplex crystallites, as shown by comparison with data obtained from PLA homopolymer stereocomplexes. Similar to those, the degree of crystallinity and melting temperature decreased with increasing molar mass of the PLA in the stereocomplexes formed from PEtOx-<em>b</em>-PLA block copolymers.</div></div>","PeriodicalId":315,"journal":{"name":"European Polymer Journal","volume":"221 ","pages":"Article 113545"},"PeriodicalIF":5.8,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of hydrogen bonding interactions, entanglement, and covalent crosslinking on the viscoelasticity of acrylic viscoelastomers containing urea group 氢键相互作用、缠结和共价交联对含尿素基团的丙烯酸粘弹性的影响

IF 5.8 2区化学

European Polymer Journal Pub Date : 2024-11-09 DOI: 10.1016/j.eurpolymj.2024.113567

Weizhong Xiang, Jianhui Xia

{"title":"Influence of hydrogen bonding interactions, entanglement, and covalent crosslinking on the viscoelasticity of acrylic viscoelastomers containing urea group","authors":"Weizhong Xiang, Jianhui Xia","doi":"10.1016/j.eurpolymj.2024.113567","DOIUrl":"10.1016/j.eurpolymj.2024.113567","url":null,"abstract":"<div><div>The structure–property relationship of acrylic clear viscoelastomer films (acrylic CVFs) as foldable optical clear adhesives (OCAs) has always been unclear. In our work, a series of acrylic CVFs with different hydrogen-bonding interactions (H-bondings) and cross-linking densities (namely, CL-H-copolymers) were synthesized. The effects of entanglement, H-bonding, and covalent crosslinking on the recovery and adhesive properties of CL-H copolymers were analyzed by rheology, equilibrium swelling, and tensile stress–strain tests (tensile tests). The structural parameter <em>M</em><sub>x</sub><em>/M</em><sub>e</sub><sup>H</sup> was obtained by combining the affine deformation model, the Flory-Rehner equation, and the UCM-Gent model, where M<sub>x</sub> is the molecular weight between covalent crosslinkers and <em>M</em><sub>e</sub><sup>H</sup> is the a physical crosslinking molecular weight affected by H-bondings. The experimental results showed that the CL-H-copolymers had an obvious dependence on <em>M</em><sub>x</sub><em>/M</em><sub>e</sub><sup>H</sup>. Recovery properties tended to stabilize (>90 %) at <em>M</em><sub>x</sub><em>/M</em><sub>e</sub><sup>H</sup> < 1, while adhesion strengths continued to decrease with decreasing <em>M</em><sub>x</sub><em>/M</em><sub>e</sub><sup>H</sup>. This conclusion and methodology are instructive for the design of foldable OCAs with high elasticity and high adhesion performance.</div></div>","PeriodicalId":315,"journal":{"name":"European Polymer Journal","volume":"221 ","pages":"Article 113567"},"PeriodicalIF":5.8,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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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