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 Q1 POLYMER SCIENCE

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

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 (CO₂P) 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 Staphylococcus aureus and Escherichia coli. 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.

考虑到阻燃剂对环境和生物友好性的要求，迫切需要开发基于低毒性原料的高效阻燃剂。本文通过牺牲模板法，在常压下进行离子交换作用，成功合成了层状双氢氧化物（LDHs）与六方氮化硼（h-BN）的纳米折叠结构 DBN@CoMo-LDH。由于混合物在基体中具有更好的相容性和更强的界面相互作用，环氧树脂（EP）复合材料可以在不损失机械性能的情况下表现出优异的阻燃性和抑烟性能。通过锥形量热试验、凝结相残留物分析和气相产物分析，研究了 EP 复合材料阻燃性能的增强及其机理。与 EP 相比，EP/4DBN@CoMo-LDH 的峰值放热率（pRR）、峰值产烟率（pSPR）、总产烟量（TSP）、一氧化碳产率（COP）和二氧化碳产率（CO2P）分别降低了 37.77%、62.96%、50.45%、45.71% 和 40.98%。DBN@CoMo-LDH 不仅能促进致密碳层的快速生成，还能有效抑制气相产物的释放。此外，它还对金黄色葡萄球菌和大肠杆菌具有优异的抗菌性能。此外，独特的纳米折叠结构还能在基质中提供良好的热传导路径，提高 EP 的导热性。这项研究为设计高性能阻燃剂提供了一种可行的方法，并提出了其在多功能 EP 复合材料中的潜在应用。

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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 Q1 POLYMER SCIENCE

European Polymer Journal

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

Roghayeh Fathi, Siamak Javanbakht, Reza Mohammadi

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 %). In vitro 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 S. aureus and E. coli 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.

本研究介绍了新型 pH 值响应型药物递送载体的创造，该载体在癌症治疗中具有潜在的应用价值。研究采用薄荷提取物（ME）原位合成双氢氧化层（LDH）生物纳米粒子（LDH-ME NPs）。将这些 NPs 加入含有果胶和海藻酸盐的生物聚合物混合配方中，制成生物纳米复合水凝胶珠。通过各种技术对其形态和化学成分进行了评估和确认。以多柔比星（DOX）为代表性抗癌药物，研究了新开发的水凝胶珠的控释性能（负载能力：∼92 %）。体外实验表明，药物释放模式对 pH 值有明显的调节作用（pH 值为 7.4 时药物释放率较高，约为 89%）。抗菌性能评估验证了水凝胶珠对金黄色葡萄球菌和大肠杆菌的有效抗菌性能，抑菌区分别约为 20 毫米和 14 毫米。MTT 检测表明，空白生物纳米复合材料水凝胶珠与 HT-29 细胞具有高度的细胞相容性（细胞存活率超过 95%）。相反，负载 DOX 的生物纳米复合水凝胶珠对 HT-29 细胞具有显著的细胞毒性（15.6 µg/mL 时细胞存活率为 13%）。这些研究结果表明，目前的生物纳米复合材料是一种前景广阔的生物平台，具有卓越的抗菌和抗癌特性。

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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 Q1 POLYMER SCIENCE

European Polymer Journal

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

Peng Xiao , Xiaojie He , Feng Zheng , Qinghua Lu

With the emergence of 5G technology, the traditional polyimide with a relatively high dielectric constant (D_k) and dielectric loss (D_f) are not suitable the requirements of ultra-high transmission and ultra-low loss. In particular, reducing the D_f 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 D_k and low D_f, based on a pair of diamine isomer containing two esters and a spiro-bis-indene structure (p-SBI2EA and m-SBI2EA), and their polymerization with 4,4′-(Hexafluoroisopropylidene)diphthalic anhydride (6FDA). The resultant polyimide films showed an exceptional dielectric property, with D_k values of 2.83 and 2.88, and D_f values of 0.0043 and 0.0048 for p-SBI2EA-6FDA and m-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 (λ_cut-off) 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.

随着 5G 技术的出现，介电常数（Dk）和介质损耗（Df）相对较高的传统聚酰亚胺已无法满足超高传输和超低损耗的要求。尤其是降低聚酰亚胺的 Df 值已成为科学和工程领域的一大难题。本文提出了一种精心设计的低 Dk 值和低 Df 值聚酰亚胺的制备方法，该方法基于一对含有两个酯和螺双烯结构的二胺异构体（p-SBI2EA 和 m-SBI2EA），并将它们与 4,4′-（六氟异亚丙基）二邻苯二甲酸酐（6FDA）聚合。由此生成的聚酰亚胺薄膜显示出卓越的介电性能，在高频率（40 GHz）下，p-SBI2EA-6FDA 和 m-SBI2EA-6FDA 的 Dk 值分别为 2.83 和 2.88，Df 值分别为 0.0043 和 0.0048。有趣的是，引入螺双茚结构后，其在高沸点和低沸点溶剂中的溶解度都显著提高。此外，PI 薄膜还表现出完美的光学性能，截止波长（λcut-off）分别为 315 纳米和 321 纳米，在 450 纳米波长下的透射率分别超过 86% 和 89%，黄化指数（YI）分别低至 1.72 和 1.63。这些 PIs 的特性使其成为 5G 高频通信和光学领域应用的理想候选材料。

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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 Q1 POLYMER SCIENCE

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

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)-Al³⁺ 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.

具有多重网络结构的复合水凝胶因其卓越的机械属性和超强的消能能力而具有巨大的潜力。然而，许多多网状水凝胶缺乏机械压缩自加固能力，因此容易发生结构性断裂。因此，亟需设计出同时具有多重网络结构和机械压缩自加固能力的复合水凝胶。在这项研究中，我们设计了一种三重网络（TN）水凝胶，采用聚（2-丙烯酰胺基-2-甲基丙烷磺酸钠）钠盐（PNaAMPS）作为第一重网络，在断裂时可产生机械自由基。聚乙烯醇（PVA）和羧甲基纤维素（CMC）-Al3+ 分别作为第二和第三网络，从而有效优化其机械性能。断裂后，破碎的 PNaAMPS 链可作为自由基引发剂，催化 TN 水凝胶中的 N-异丙基丙烯酰胺（NIPAM）单体聚合，形成 PNIPAM 链。此外，通过连续破坏网络和注入 NIPAM 单体，三重网络凝胶的机械强度可以显著提高。此外，我们还使用荧光探针 8-苯胺基-1-萘磺酸（ANS）评估了机械压缩自加固的程度。这种探针能直观地量化 PNIPAM 的生成，并通过荧光信号对机械强度自加固水平提供有价值的反馈。我们的方法为开发具有荧光反馈能力的机械增效复合水凝胶奠定了基础，可用于自加固评估。

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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 Q1 POLYMER SCIENCE

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

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/CaCl₂ 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.

在应变传感器中，抗疲劳、耐冷冻和耐脱水的水凝胶具有独特的吸引力。将水凝胶浸泡在有机溶剂中是提高抗冻性和抗脱水性的有效方法，但这可能会导致导电性变差。此外，离子注入被认为是解决上述问题的最可行方法，但高浓度的盐离子会导致机械性能减弱。因此，如何简便地制备出抗冻、抗脱水且具有优异抗疲劳性能的水凝胶仍是一项挑战。本文设计了一种聚乙烯醇/聚丙烯酰胺/聚丙烯酸/二甲基亚砜/CaCl2杂化水凝胶，并通过简便的一步法制备出了兼顾多种优异性能的水凝胶。由于多种材料的杂化设计，该杂化水凝胶具有较高的离子电导率（∼0.2 S/m）、强度（∼0.36 MPa）和拉伸性（∼825 %）。同时，混合水凝胶还具有突出的抗冻性、抗脱水性和抗疲劳性。在应变为 100 % 的情况下拉伸 1000 次、暴露于环境中 30 天或低温冷冻后，其机械性能几乎没有下降。此外，基于混合水凝胶的染色传感器显示出线性灵敏度（0-400 % 应变范围内的 GF = 1.12）和快速响应性（200 毫秒），可以稳定地监测人体的各种活动，在可穿戴健康监测和柔性电动皮肤方面具有显著的应用潜力。

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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 Q1 POLYMER SCIENCE

European Polymer Journal

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

Hisao Hori , Hisashi Saito , Abdelatif Manseri , Bruno Ameduri

Decomposition of poly(tetrafluoroethylene-co-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 (O₂, H₂O₂) or an alkaline reagent (KOH). When O₂ was chosen, the highest F^– and CO₂ 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 CHF₃ were detected in the gas phase, the amount of which decreased with increasing the reaction time. H₂O₂ gave slightly higher reactivity than O₂. 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^– yield reached 98 %. Hence, complete fluorine mineralization was achieved, where very little CO₂ (∼0% yield) and no CHF₃ were generated in the gas phase. Furthermore,¹⁹F NMR spectroscopy and combustion-ion chromatography revealed that the reaction solutions did not contain any organofluorine compounds during the reactions. FEP decomposed, releasing F^– into the reaction solution, resulting in the formation of amorphous carbon in the residue.

研究了聚四氟乙烯-六氟丙烯共聚物（FEP）在超临界和亚临界水中的分解情况，目的是进行废物处理。通过使用氧化剂（O2、H2O2）或碱性试剂（KOH）对这种分解的效率进行了检验。在这些条件下，气相中检测到了微量的 CHF3，其含量随着反应时间的延长而减少。H2O2 的反应活性略高于 O2。与此相反，与 KOH 的反应可诱导有效的氟矿化。当 FEP 在 360 °C 的 3.0 M KOH 溶液中反应 18 小时后，氟产量达到 98%。因此，实现了完全的氟矿化，在气相中只生成了极少量的 CO2（产率为 ∼ 0%），没有生成 CHF3。此外，19F NMR 光谱和燃烧离子色谱法显示，反应溶液在反应过程中不含有任何有机氟化合物。FEP 分解后将 F- 释放到反应溶液中，在残留物中形成无定形碳。

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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 Q1 POLYMER SCIENCE

European Polymer Journal

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

Hailan Ren , Shujun Zou , Sijing He, Qinfeng Rong

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 (FeCl₃) 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 FeCl₃. Excellent mechanical properties were achieved of the PATAC-TA/Fe³⁺ hydrogel: fracture strain of 2234 %, fracture stress of 188.57 kPa, and toughness of 2.93 MJ/m³. 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.

基于水凝胶的可穿戴传感器因其独特的性能在传感电子领域引起了极大的关注。然而，探索同时具有高拉伸性、自愈性和可回收性的水凝胶传感器仍是一项挑战。在这项工作中，我们报告了一种以（3-丙烯酰胺丙基）三甲基氯化铵（ATAC）、单宁酸（TA）和氯化铁（FeCl3）为原料制造高性能聚合物水凝胶的简单方法。网络中存在两种非共价相互作用：PATAC 和 TA 之间的氢键作用，以及 TA 和 FeCl3 之间的金属配位相互作用。PATAC-TA/Fe3+ 水凝胶具有优异的机械性能：断裂应变为 2234%，断裂应力为 188.57 kPa，韧性为 2.93 MJ/m3。由于非共价交联网络的可逆性，水凝胶在接触 24 小时后的自愈合效率可达 96.62%。同时，在溶解和干燥后，受损水凝胶的拉伸性、导电性和自愈性都得到了恢复。因此，基于水凝胶的应变传感器可用于实时监测各种人体活动，包括语音识别、面部表情识别和关节弯曲。结合这些突出特点，这种通过简便、绿色的制备过程实现高度自愈合和可回收的水凝胶将在可持续可穿戴传感器领域具有巨大的应用潜力。

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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 Q1 POLYMER SCIENCE

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

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.

本综述论文探讨了阿雷卡果壳纤维作为合成纺织品可持续替代品的潜力，重点关注其成分、特性、提取方法和应用。阿雷卡果壳是一种富含纤维素、半纤维素和木质素的木质纤维素材料，在印度等地区是一种丰富的农副产品。尽管目前其利用率不高，但它具有优异的机械和热性能，因此适合多种应用，包括生物复合材料、可生物降解包装、纺织品和建筑材料。综述重点介绍了优化纤维质量的提取和加工技术，如碱性处理，并讨论了纤维的优势，如可再生性、生物降解性和成本效益。环境影响评估强调了用阿雷卡果壳纤维替代合成纤维的生态效益，强调了其减少碳排放和废物的潜力。虽然这种纤维在多个行业都大有可为，但论文也谈到了当前的挑战和进一步研究的必要性，以充分发挥其作为合成纤维绿色替代品的潜力。

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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 Q1 POLYMER SCIENCE

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

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 l-lactide as well as d-lactide. The resulting PEtOx-b-PLA block copolymers featured DP values of 25, 50, 100, and 150, respectively, and were characterized by means of size exclusion chromatography, ¹H 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-b-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-b-PLA block copolymers.

通过乙酸酯终止 2-乙基-2-噁唑啉的阳离子开环聚合，然后用甲醇进行酯交换反应，得到了一种ω-羟基端聚合（2-乙基-2-噁唑啉）（PEtOx）。生成的 PEtOx-OH 聚合度（DP）为 18，可用作 l-内酰胺和 d-内酰胺开环聚合的大引发剂。得到的 PEtOx-b-PLA 嵌段共聚物的 DP 值分别为 25、50、100 和 150，并通过尺寸排阻色谱法、1H NMR 光谱法和基质辅助激光解吸电离质谱法进行了表征。差示扫描量热法、广角 X 射线散射法和偏光显微镜表明，在具有相反手性的 PEtOx-b-PLA 外消旋混合物中形成了立体络合物。因此，与聚乳酸均聚物立体络合物的数据相比，无定形的 PEtOx 嵌段并不影响立体络合物晶体的修饰。与上述数据类似，在 PEtOx-b-PLA 嵌段共聚物形成的立体共聚物中，结晶度和熔化温度随聚乳酸摩尔质量的增加而降低。

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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 Q1 POLYMER SCIENCE

European Polymer Journal

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

Weizhong Xiang, Jianhui Xia

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 M_x/M_e^H was obtained by combining the affine deformation model, the Flory-Rehner equation, and the UCM-Gent model, where M_x is the molecular weight between covalent crosslinkers and M_e^H 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 M_x/M_e^H. Recovery properties tended to stabilize (>90 %) at M_x/M_e^H < 1, while adhesion strengths continued to decrease with decreasing M_x/M_e^H. This conclusion and methodology are instructive for the design of foldable OCAs with high elasticity and high adhesion performance.

丙烯酸透明粘弹性薄膜（丙烯酸 CVF）作为可折叠光学透明粘合剂（OCA）的结构-性能关系一直不明确。在我们的工作中，合成了一系列具有不同氢键相互作用（H-键）和交联密度的丙烯酸透明粘弹性薄膜（即 CL-H-共聚物）。通过流变学、平衡溶胀和拉伸应力应变试验（拉伸试验）分析了缠结、氢键和共价交联对 CL-H 共聚物的恢复和粘合性能的影响。结构参数 Mx/MeH 是结合仿射变形模型、Flory-Rehner 方程和 UCM-Gent 模型得到的，其中 Mx 是共价交联剂之间的分子量，MeH 是受 H 键影响的物理交联分子量。实验结果表明，CL-H-共聚物与 Mx/MeH 有明显的依赖关系。当 Mx/MeH 为 1 时，恢复性能趋于稳定（90%），而粘附强度则随着 Mx/MeH 的降低而降低。这一结论和方法对设计具有高弹性和高粘附性能的可折叠 OCA 具有指导意义。

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