Polymer最新文献_第10页

Multistep synthesis of heterocyclic Schiff base–derived polybenzoxazines for direct carbonization into N, O, S–co-doped microporous carbons with dual CO2 capture and supercapacitor performance 多步合成希夫碱衍生杂环聚苯并恶嗪直接碳化成N， O， s共掺杂微孔碳，具有双CO2捕集和超级电容器性能

IF 4.5 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2026-03-06 Epub Date: 2026-01-29 DOI: 10.1016/j.polymer.2026.129674

Yun-Chien Zheng , Shimaa Abdelnaser , Yousra M. Nabil , Mostafa Sayed , Shiao-Wei Kuo , Chih-Feng Wang , Mostafa Ahmed , Ahmed F.M. EL-Mahdy

The rising demand for sustainable energy storage and carbon mitigation calls for multifunctional materials that integrate high surface area, tailored heteroatom chemistry, and robust electrochemical stability. Herein, we report a continuous three-step synthesis of two novel heterocyclic Schiff base–derived benzoxazine monomers—3-(6-methoxybenzo [d]thiazol-2-yl)-3,4-dihydro-2H-benzo[e][1,3]oxazine (SA-tz Bz) and 3-(6-methoxybenzo [d]thiazol-2-yl)-3,4-dihydro-2H-naphtho[2,1-e][1,3]oxazine (NA-tz Bz)—through sequential Schiff base formation, reduction, and Mannich condensation. Thermal ring-opening polymerization followed by direct carbonization at 600 and 700 °C under an inert atmosphere yielded N, O, S co-doped microporous carbons (C@poly (SA-tz Bz) and C@poly (NA-tz Bz)) without the need for activating agents or wastewater generation. These heteroatom-enriched carbons exhibit disordered amorphous structures with hierarchical porosity, abundant pyridinic/pyrrolic nitrogen species, and oxygen/sulfur functionalities, as confirmed by BET, Raman, XPS, and TEM analyses. Electrochemical studies revealed that C@poly (NA-tz Bz 700) delivers a high specific capacitance of 423 ± 18 F g⁻¹ at 0.5 A g⁻¹ in a three-electrode system, good cycling stability (98 % retention after 6000 cycles), and superior performance in a symmetric two-electrode device (342 F g⁻¹, 89.50 % retention after 4000 cycles). Moreover, C@poly (NA-tz Bz 700) achieves an exceptional CO₂ adsorption capacity of 231.7 cm³ g⁻¹ at 273 K, surpassing many reported heteroatom-doped carbons. This work presents a sustainable strategy for designing heterocyclic benzoxazine-derived microporous carbons that combine efficient energy storage with effective CO₂ capture, offering promising prospects for next-generation electrochemical and environmental applications.

对可持续能源储存和碳减排的需求不断增长，要求多功能材料集成高表面积、定制杂原子化学和强大的电化学稳定性。在此，我们报道了两个新的杂环希夫碱衍生的苯并恶嗪单体-3 -（6-甲氧基苯并[d]噻唑-2-基）-3,4-二氢- 2h -苯并[e][1,3]恶嗪（SA-tz Bz）和3-（6-甲氧基苯并[d]噻唑-2-基）-3,4-二氢- 2h -萘并[2,1-e][1,3]恶嗪(NA-tz Bz) -通过顺序的希夫碱形成、还原和曼尼希缩合合成。热开环聚合，然后在600℃和700℃的惰性气氛下直接碳化，得到N， O， S共掺杂的微孔碳（C@poly （SA-tz Bz）和C@poly (NA-tz Bz)），而不需要活化剂或产生废水。通过BET、拉曼、XPS和TEM分析证实，这些富含杂原子的碳表现出无序的无定形结构，具有分层孔隙，丰富的吡啶/吡啶氮和氧/硫官能团。电化学研究表明，C@poly （NA-tz Bz 700）在三电极系统中在0.5 a g−1时具有423±18 F g−1的高比电容，具有良好的循环稳定性（6000次循环后保持98%），在对称双电极装置中具有优异的性能（342 F g−1,4000次循环后保持89.50%）。此外，C@poly （NA-tz Bz 700）在273 K下具有231.7 cm3 g−1的CO2吸附能力，超过了许多报道的杂原子掺杂碳。本研究为杂环苯并恶嗪衍生微孔碳的设计提供了一种可持续的策略，该策略结合了高效的能量储存和有效的二氧化碳捕获，为下一代电化学和环境应用提供了广阔的前景。

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引用次数: 0

Energy dissipation and rate-dependent deformation behavior of shear thickening fluid integrated polyurethane foam nanocomposites 剪切增稠流体集成聚氨酯泡沫纳米复合材料的能量耗散和速率相关变形行为

IF 4.5 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2026-03-06 Epub Date: 2026-01-28 DOI: 10.1016/j.polymer.2026.129668

Emre Gunduz , Bunyamin Karagoz , İpek Ösken , Kaan Yildiz , Hulya Cebeci

Designing energy dissipative polymeric foams is essential for many applications to withstand various loading scenarios. This study is aimed to improve the compressive and energy absorption properties of polyurethane foams with shear thickening fluid (STF) integration while discussing microstructure-mechanical property relationship. Initially, STFs were fabricated with between 19 and 28 wt% fumed silica content and investigated by a rheometer. 26 wt% silica was found to be optimum for integration into polyurethane foams, yielding an excellent thickening ratio of 67. Therefore, 26 wt% STFs were integrated into rigid PU foams at 0.5, 1, and 3 wt%, and morphological analyses, cyclic compression tests at various strains and strain rates were performed to develop microstructure-mechanical property relationship. The results revealed that 1 wt% STF-integrated polyurethane foams presented the highest specific compressive strength with 33 % and 10.4 % enhancements, respectively. Furthermore, 1 wt% STF integration generated up to 50 % greater energy dissipation over 10 cycles.

设计能量耗散聚合物泡沫是必不可少的许多应用，以承受各种负载情况。本研究旨在探讨剪切增稠流体（STF）集成的聚氨酯泡沫材料的微观结构-力学性能关系，以提高其压缩和吸能性能。最初，stf是用19 - 28%的气相二氧化硅含量制作的，并通过流变仪进行研究。26 wt%的二氧化硅被发现是最适合整合到聚氨酯泡沫中，产生优异的增稠比为67。因此，将26 wt%的STFs以0.5、1和3 wt%的比例整合到硬质PU泡沫中，并进行形态学分析、不同应变和应变速率下的循环压缩试验，以建立微观结构-力学性能关系。结果表明，1 wt%的stf集成聚氨酯泡沫具有最高的比抗压强度，分别提高了33%和10.4%。此外，1 wt%的STF集成在10个循环中产生高达50%的能量耗散。

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引用次数: 0

The morphological control and formation mechanism of porous electrospun polyvinylidene fluoride fibers 静电纺多孔聚偏氟乙烯纤维的形态控制及形成机理

IF 4.5 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2026-03-06 Epub Date: 2026-02-02 DOI: 10.1016/j.polymer.2026.129693

Yueling Shen, Ying Xu, Chen Chen, Cheng Zou, Yaoyao Yang, Deng-guang Yu

By integrating non-solvent induced phase separation (NIPS) with electrospinning technology, porous electrospun fibers can be prepared in a single step. However, the underlying mechanism of phase separation process during electrospinning are still not well understood. In this study, the regulatory effects of non-solvent types and their addition amounts on the morphology and composition of polyvinylidene fluoride (PVDF) electrospun fibers were systematically investigated by constructing various solvent/non-solvent systems, employing N,N-Dimethylacetamide (DMAC) or N,N-Dimethylformamide (DMF) as solvents, and water or ethanol as non-solvents. The results indicated that the incorporation of non-solvent significantly enhanced fiber diameter and uniformity, while promoting the formation of bicontinuous pores. Regardless of whether DMAC or DMF is used as the solvent, employing ethanol as the non-solvent results in a more uniform and densely packed porous structure compared to water. As the amount of non-solvent added increases, the internal porous structure of the fibers becomes increasingly superior. Additionally, the addition of non-solvent effectively facilitated the formation of β-phase and γ-phase through hydrogen bonding and confinement effects. The mechanism of NIPS-electrospinning was elucidated through ternary phase diagram and TGA analysis. Specifically, solvent evaporation led to the accumulation of condensed water on the fiber surface, triggering fiber solidification. Subsequently, the NIPS process continued internally within the fibers, resulting in the formation of superporous fibers with an internal bicontinuous pore structure.

将非溶剂诱导相分离（NIPS）技术与静电纺丝技术相结合，可以一步制备多孔静电纺丝纤维。然而，静电纺丝过程中相分离过程的基本机理尚不清楚。本研究以N，N-二甲基乙酰胺（DMAC）或N，N-二甲基甲酰胺（DMF）为溶剂，以水或乙醇为非溶剂，构建不同的溶剂/非溶剂体系，系统研究了非溶剂类型及其添加量对聚偏氟乙烯（PVDF）静电纺丝纤维形态和组成的调节作用。结果表明，非溶剂的加入显著提高了纤维直径和均匀性，同时促进了双连续孔的形成。无论使用DMAC还是DMF作为溶剂，使用乙醇作为非溶剂，与水相比，可以获得更均匀和致密的多孔结构。随着非溶剂添加量的增加，纤维的内部多孔结构也越来越优越。此外，非溶剂的加入通过氢键和约束效应有效地促进了β相和γ相的形成。通过三元相图和TGA分析阐明了nips静电纺丝的机理。具体来说，溶剂蒸发导致纤维表面积聚冷凝水，引发纤维凝固。随后，NIPS过程在纤维内部继续进行，形成了具有内部双连续孔结构的超多孔纤维。

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引用次数: 0

Molecular dynamics study on the influence of a liquid-crystalline co-curing agent on the curing behavior and mechanical properties of epoxy resins 液晶共固化剂对环氧树脂固化性能和力学性能影响的分子动力学研究

IF 4.5 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2026-03-06 Epub Date: 2026-02-03 DOI: 10.1016/j.polymer.2026.129675

Le Zhou , Chunhua Zhu , Junhua Zhao

Epoxy resins are widely used in energy storage devices, electronic encapsulation, and structural adhesives owing to their excellent adhesion and electrical insulation properties. However, conventional epoxy systems still face challenges related to mechanical robustness and long-term service reliability. Molecular dynamics (MD) simulations provide an effective means to investigate structure–property relationships in crosslinked epoxy networks, yet their application is often hindered by the complexity of curing reactions and the limited efficiency and reproducibility of traditional atomistic modeling workflows. In this work, a lightweight graphical user interface (GUI) was developed to facilitate automatic and user-friendly generation of reaction-mapping templates for reactive molecular dynamics simulations based on the AutoMapper–LAMMPS fix bond/react framework. Using this platform, a ternary epoxy system comprising epoxy resin, curing agent, and a mesogenic comonomer was established. By systematically varying the crosslinking degree and comonomer content, the effects of network topology and local molecular ordering on mechanical behavior were elucidated. The results provide molecular-level insight into strategies for enhancing epoxy toughness without significantly compromising stiffness and demonstrate a generalizable and efficient methodology for simulating complex crosslinked polymer systems.

环氧树脂因其优异的附着力和电绝缘性能，被广泛应用于储能器件、电子封装、结构胶粘剂等领域。然而，传统的环氧树脂系统仍然面临着与机械稳健性和长期使用可靠性相关的挑战。分子动力学（MD）模拟为研究交联环氧树脂网络的结构-性能关系提供了一种有效的手段，但其应用往往受到固化反应的复杂性和传统原子建模工作流程有限的效率和可重复性的阻碍。在这项工作中，开发了一个轻量级的图形用户界面（GUI），以促进基于AutoMapper-LAMMPS固定键/反应框架的反应分子动力学模拟反应映射模板的自动和用户友好生成。利用该平台，建立了由环氧树脂、固化剂和介观共聚单体组成的三元环氧体系。通过系统地改变交联度和共聚单体含量，研究了网络拓扑结构和局部分子排序对力学行为的影响。研究结果为在不显著影响刚度的情况下提高环氧树脂韧性的策略提供了分子水平的见解，并为模拟复杂交联聚合物体系展示了一种可推广且有效的方法。

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引用次数: 0

Effects of geometric discontinuities on tensile fatigue deterioration and life estimation in additively manufactured polylactic acid (PLA) parts 几何不连续对增材制造聚乳酸（PLA）零件拉伸疲劳劣化和寿命估计的影响

IF 4.5 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2026-03-06 Epub Date: 2026-02-05 DOI: 10.1016/j.polymer.2026.129706

Mahsima Seifollahi, Mohammad Zaman Kabir, Sara Golbabapour

In this study, an integrated experimental–analytical framework was employed to investigate the effects of geometric imperfections on the static and fatigue behaviour of 3D-printed polylactic acid (PLA) specimens. The specimens were fabricated using Fused Deposition Modeling (FDM) with YZ orientation and a concentric infill pattern. Experimental results showed that a central hole with a stress concentration factor of 1.95 resulted in approximately 17% shorter fatigue life compared to edge-notched specimens. Notches and holes with a 2 mm radius yielded fatigue notch factors of 1.12 and 1.15, respectively, emphasizing the dominant influence of process-induced internal defects on fatigue damage evolution. To determine the notch geometry that can override the effect of internal defects on fatigue behaviour, the Theory of Critical Distance (TCD) coupled with numerical models was used to estimate the fatigue notch factor. In the numerical simulations, the internal porosity of the 3D-printed samples was taken into account to capture the interaction between notches and inherent defects. The analysis identified a notch aspect ratio of 0.25 as critical, exhibiting the highest fatigue notch factor of 1.59. Then, crack growth behaviour was monitored using Digital Image Correlation (DIC) and analysed through the Paris law to determine material constants. Fatigue life was subsequently estimated using a defect-based approach for 3D-printed PLA, explicitly accounting for process-induced internal defects.

在这项研究中，采用了一个集成的实验分析框架来研究几何缺陷对3d打印聚乳酸（PLA）样品的静态和疲劳行为的影响。采用YZ取向和同心填充模式的熔融沉积模型（FDM）制备样品。试验结果表明，中心孔的应力集中系数为1.95，与边缘缺口相比，中心孔的疲劳寿命缩短了约17%。半径为2mm的缺口和孔的疲劳缺口系数分别为1.12和1.15，强调了工艺诱导的内部缺陷对疲劳损伤演化的主导影响。为了确定能够覆盖内部缺陷对疲劳行为影响的缺口几何形状，采用临界距离理论（TCD）与数值模型相结合的方法估计了疲劳缺口因子。在数值模拟中，考虑了3d打印样品的内部孔隙率，以捕捉缺口和固有缺陷之间的相互作用。分析确定缺口长径比为0.25为临界值，显示出最高的疲劳缺口系数为1.59。然后利用数字图像相关（DIC）技术监测裂纹扩展行为，并利用Paris定律进行分析，确定材料常数。随后，使用基于缺陷的方法对3d打印PLA进行疲劳寿命估计，明确考虑了工艺引起的内部缺陷。

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引用次数: 0

Impact of amino functionalization on gelation properties of random terpolymer of oligo(ethylene glycol) methacrylates in water and physiological media 氨基功能化对低聚（乙二醇）甲基丙烯酸酯无规三元共聚物在水和生理介质中胶凝性能的影响

IF 4.5 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2026-03-06 Epub Date: 2026-01-29 DOI: 10.1016/j.polymer.2026.129652

D. Lipowska-Kur , P. Groch , Ł. Otulakowski , K. Filipek , K. Jelonek , A. Utrata-Wesołek

Thermoreversible gels (thermogels) are formed when solutions of thermoresponsive polymers transition from a low-viscosity liquid state to a gel state upon exceeding the gelation temperature (T_GEL). This property makes them attractive materials for a wide range of biomedical applications, including tissue engineering and drug delivery. While the gelation mechanism of block copolymers containing hydrophilic and hydrophobic segments are well understood, the ability of random copolymers, particularly those containing thermoresponsive units, to form stable gels is still not well established. In this work, we explore the gelation behavior of random copolymers based on oligo(ethylene glycol) methacrylates, focusing on the impact of amino functional groups studied in their ammonium and amine forms, and directly comparing them to non-functionalized polymer. As comonomers, oligo(ethylene glycol) methacrylate (O; M_n = 300 g/mol), di(ethylene glycol) methacrylate (D) and 2-aminoethyl methacrylate hydrochloride, introducing amino groups (in A⁽⁺⁾ NH₃⁺ and A NH₂ form), were used. The gelation behavior of the resulting copolymers was influenced by the presence of amine groups, their ionization state and the type of medium (water or PBS). Both the non-functionalized copolymer P(OD) and the amino-functionalized copolymer P(AOD) formed thermogels in water and PBS, whereas the ammonium-functionalized copolymer P(A⁽⁺⁾OD) exhibited gelation only in PBS. Moreover, the P(AOD) gel demonstrated superior mechanical strength and a more stable polymer network compared with the P(OD) gel, indicating a beneficial effect of amino groups on the properties of thermogelling materials. In addition, the amine-functionalized copolymer was found to be non-toxic, making the obtained materials particularly promising for biomedical applications.

热可逆凝胶（热凝胶）是当热响应性聚合物的溶液在超过凝胶化温度（TGEL）后从低粘度液态转变为凝胶态时形成的。这种特性使它们成为广泛的生物医学应用的有吸引力的材料，包括组织工程和药物输送。虽然含有亲水和疏水段的嵌段共聚物的凝胶机制已经被很好地理解，但随机共聚物，特别是那些含有热响应单元的共聚物，形成稳定凝胶的能力仍然没有很好地确定。在这项工作中，我们探索了基于低聚（乙二醇）甲基丙烯酸酯的无规共聚物的凝胶行为，重点研究了氨基官能团在其铵态和胺态中的影响，并直接将它们与非官能团聚合物进行了比较。以低聚（乙二醇）甲基丙烯酸酯（O; Mn = 300 g/mol）、二（乙二醇）甲基丙烯酸酯(D)和2-氨基甲基丙烯酸乙酯盐酸盐为共聚单体，引入氨基（以A(+) NH3+和A NH2形式）。所得共聚物的凝胶行为受胺基的存在、它们的电离状态和介质类型（水或PBS）的影响。非功能化共聚物P（OD）和氨基功能化共聚物P（AOD）在水和PBS中均形成热凝胶，而氨功能化共聚物P（A(+)OD）仅在PBS中形成凝胶。此外，与P（OD）凝胶相比，P（AOD）凝胶表现出更好的机械强度和更稳定的聚合物网络，这表明氨基对热凝胶材料的性能有有益的影响。此外，胺功能化共聚物被发现是无毒的，使所获得的材料在生物医学应用方面特别有前景。

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引用次数: 0

Molecular dynamics study on the formation of the interface between low-density polyethylene and cross-linked polyethylene 低密度聚乙烯与交联聚乙烯界面形成的分子动力学研究

IF 4.5 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2026-03-06 Epub Date: 2026-02-02 DOI: 10.1016/j.polymer.2026.129696

Chuxuan Chen, Zhaoyi Liu, Chaoqun Liu, Wei Yang, Guoqi Ma, Jiaping Pan, Yang Lv, Jinghui Gao, Li Yin

Exploring the interfacial behavior between different polymers is a hot issue in macromolecular blend materials. This paper takes low-density polyethylene (LDPE), cross-linked polyethylene (XLPE) and dicumyl peroxide (DCP) as models to investigate the interface formation process of different polymers and the diffusion behavior of small molecules by molecular dynamics simulation method using Consistent-Valence Force Field (CVFF) force field. The results reveal that interface between LDPE and XLPE forms through the penetration of linear polymer chains to cross-linked polymer chains, and van der Waals potential is the main driving attractive force. Temperature, pressure, and polymer network structure were found to have significantly influence the interface formation process. Additionally, DCP can introduce corss-linking structures to interface in theroy, the mobility of DCP in XLPE and LDPE were investigated and found that the diffusion coefficients of DCP in XLPE is only 1%–8% campring to that in LDPE. This study contributes to a further understanding of the interfacial formation mechanism of LDPE/XLPE blends.

研究不同聚合物之间的界面行为是高分子共混材料研究的热点问题。本文以低密度聚乙烯（LDPE）、交联聚乙烯（XLPE）和过氧化二氨基苯（DCP）为模型，采用一致价力场（CVFF）力场的分子动力学模拟方法，研究了不同聚合物的界面形成过程和小分子的扩散行为。结果表明，LDPE和XLPE之间的界面是通过线性聚合物链向交联聚合物链的渗透形成的，范德华势是主要的驱动引力。发现温度、压力和聚合物网络结构对界面形成过程有显著影响。DCP在XLPE和LDPE中的迁移率研究发现，DCP在XLPE中的扩散系数仅为LDPE中的1% ~ 8%。本研究有助于进一步了解LDPE/XLPE共混体系的界面形成机制。

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引用次数: 0

Temperature-responsive hyperbranched block copolymers via RAFT self-condensing vinyl polymerization RAFT自缩聚法制备温度响应型超支化嵌段共聚物

IF 4.5 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2026-03-06 Epub Date: 2026-02-03 DOI: 10.1016/j.polymer.2026.129699

Brett McLeland, Dean Afsar, Ayesha Imiya Mudiyanselage, Patricia R. Calvo

Stimuli-responsive polymers that undergo sharp transitions in aqueous solution are of broad interest for drug delivery, sensing, and self-assembly. Here we report the synthesis of hyperbranched poly(N-isopropylacrylamide)-b-poly(N,N-dimethylacrylamide) (HB-PNIPAM-b-PDMA) block copolymers via reversible addition–fragmentation chain transfer (RAFT)-mediated self-condensing vinyl polymerization (SCVP) of well-defined macro chain-transfer monomers (macro-CTMs). PNIPAM and PDMA precursors were prepared with high end-group fidelity and converted to macro-CTMs, enabling hyperbranched chain extensions alongside linear and random analogues for systematic comparison. All polymerizations proceeded to high conversion, and the degree of branching was tunable with monomer feed and precursor length. Thermoresponsive behavior was strongly influenced by architecture. Linear block copolymers exhibited composition-dependent cloud points between 48 and 67 °C, while random copolymers showed transitions ∼10 °C higher than their block counterparts. In contrast, hyperbranched copolymers displayed broadened and shifted transitions, with cloud points spanning ∼31.5 °C to >80 °C depending on composition, degree of polymerization, and macro-CTM identity. Dynamic light scattering confirmed thermal aggregation above the transition. These results establish branching as a powerful design parameter for tuning the location and breadth of thermal transitions beyond what is achievable with linear copolymers, offering new opportunities for engineering responsive assemblies with tailored properties.

在水溶液中经历急剧转变的刺激响应聚合物对药物传递，传感和自组装具有广泛的兴趣。在这里，我们报道了通过可逆加成-裂解链转移（RAFT）介导的乙烯基自缩合聚合（SCVP）合成超支化聚（N-异丙基丙烯酰胺）-b-聚（N，N-二甲基丙烯酰胺）（HB-PNIPAM-b-PDMA）嵌段共聚物的方法。PNIPAM和PDMA前体以高端基保真度制备，并转化为宏观ctms，使超支链扩展与线性和随机类似物一起进行系统比较。所有的聚合都进行了高转化，分支的程度是可调的单体投料和前驱体长度。热响应行为受到建筑结构的强烈影响。线性嵌段共聚物在48 ~ 67°C之间表现出组分依赖的云点，而随机共聚物的跃迁比嵌段共聚物高~ 10°C。相比之下，超支化共聚物表现出展宽和移位的过渡，云点跨越~ 31.5°C至>；80°C，具体取决于组成、聚合程度和宏观ctm同一性。动态光散射证实了跃迁上方的热聚集。这些结果确立了分支作为一个强大的设计参数，用于调整热转变的位置和宽度，而不是线性共聚物所能实现的，为具有定制性能的工程响应组件提供了新的机会。

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引用次数: 0

Green engineering of water-insoluble PVA/PAA nanofiber respiratory membranes for efficient particulate matter filtration with low pressure drop 水不溶性PVA/PAA纳米纤维呼吸膜的绿色工程，高效低压降颗粒物过滤

IF 4.5 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2026-03-06 Epub Date: 2026-01-22 DOI: 10.1016/j.polymer.2026.129634

Ashraful Islam , Sudip Kumar Lahiri , Md. Akil Akhter , Muhammad Imran , Dong Mengmeng , Yanbo Liu

Air pollution is a major concern due to rising particulate matter (PM) levels, requiring efficient filtration technologies for respiratory protection, and integrating eco-friendly fabrication methods further enhances environmental sustainability. We report water-insoluble nanofibrous membranes that combine high filtration efficiency (FE) with a low pressure drop (ΔP) for use in such masks. Using 18 % (w/v) polyvinyl alcohol (PVA) and polyacrylic acid (PAA) solutions in water, we electrospun four types of nanofiber membranes under optimised conditions (25 kV, 20 cm, 25 °C, 50 % RH). These included a pure PVA membrane and three PVA/PAA (60/40 wt%) composite membranes containing PAA of 3 kDa (NFM-1), 50 kDa (NFM-2), and both 3 kDa and 50 kDa (NFM-3). To induce crosslinking, all membranes were heat-treated at 100–160 °C for 25 min. Filtration tests showed that NFM-2 heat-treated at 140 °C achieved ∼99 % FE for particles ≥0.5 μm, with a ΔP of only 48 ± 1 Pa. Scanning electron microscopy (SEM) revealed smooth fibers with an average diameter of ∼192 nm and 59 % porosity for NFM-2. Fourier transform infrared (FTIR) spectroscopy confirmed the formation of ester linkages (–CO–O–R) at ≥120 °C between PVA and PAA, indicating successful thermal crosslinking and improved stability. After crosslinking, NFM-2 also exhibited a water contact angle (θ) of ∼90° and retained 100 % of its weight after immersion in 70 °C water, demonstrating complete water insolubility. The nanofiber membranes were further integrated with polypropylene (PP) spunbond and meltblown nonwovens in multilayer assemblies (up to four layers) to evaluate composite filter performance. This water-based, organic-solvent-free electrospinning process offers a green approach to producing high-performance respiratory filters.

由于颗粒物（PM）水平的上升，空气污染是一个主要问题，需要有效的过滤技术来保护呼吸，而整合环保的制造方法进一步提高了环境的可持续性。我们报道了一种结合了高过滤效率（FE）和低压降（ΔP）的水不溶性纳米纤维膜，用于这种口罩。我们使用18% （w/v）的聚乙烯醇（PVA）和聚丙烯酸（PAA）水溶液，在优化条件（25 kV, 20 cm, 25°C, 50% RH）下静电纺丝四种类型的纳米纤维膜。其中包括纯PVA膜和三种PVA/PAA （60/40 wt.%）复合膜，其中PAA为3 kDa (NFM-1), 50 kDa (NFM-2)，以及3 kDa和50 kDa （NFM-3）。为了诱导交联，所有膜在100-160°C下热处理25分钟。过滤试验表明，对于≥0.5 μm的颗粒，经过140℃热处理的NFM-2在ΔP仅为48±1 Pa时获得了~ 99%的FE。扫描电子显微镜显示光滑的纤维，平均直径为~ 192 nm， NFM-2的孔隙率为59%。傅里叶变换红外光谱（FTIR）证实PVA和PAA在≥120℃时形成酯键（-C = O-O-R），表明热交联成功，稳定性提高。交联后，NFM-2的水接触角（θ）为~ 90°，在70℃水中浸泡后仍能保持100%的重量，表现出完全的水不溶性。纳米纤维膜进一步与聚丙烯（PP）纺粘和熔喷非织造布在多层组件（多达四层）中集成，以评估复合过滤性能。这种水基、无有机溶剂的静电纺丝工艺为生产高性能呼吸过滤器提供了一种绿色方法。

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引用次数: 0

Highly efficient H2O2 photosynthesis coupled with benzylamine oxidation catalyzed by donor-acceptor type vinylene-linked covalent organic frameworks 用乙烯-受体共价有机框架催化H2O2与苯胺氧化的高效光合作用

IF 4.5 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2026-03-06 Epub Date: 2026-01-28 DOI: 10.1016/j.polymer.2026.129671

Shujie Qiao, Machao Wang, Jun Wang, Mingshuan Yang, Zhiyong Guo, Hongbing Zhan

Photocatalytic hydrogen peroxide (H₂O₂) production is a safe, economical and environmentally friendly method to convert solar energy into storable chemical energy. However, the slow water oxidation process derived from the photogenerated valence holes is one of the main obstacles for the H₂O₂ generation. The abovementioned dilemma can be resolved by consuming holes with sacrificial agent, e.g. benzylamine. In this paper, two vinylene-linked covalent organic frameworks (denoted as TMBP-1 and TMBP-2) with different donor-acceptor (D-A) strengths were synthesized. The constructed D-A architecture promoted the intramolecular charge transfer, which bolstered their corresponding photocatalytic performance. Impressively, when TMBP-2 adopted as the photocatalyst and air employed as the sole oxidant, highly efficient benzylamine coupling yield (>99.9 %) with a high H₂O₂ production up to 6.3 mmol g⁻¹ h⁻¹ can be obtained within 5 h under ambient conditions. Generally, this work provided a green pathway for the photocatalytic H₂O₂ production together with the manufacture of high value-added chemical intermediates.

光催化过氧化氢（H2O2）生产是一种安全、经济、环保的将太阳能转化为可储存的化学能的方法。然而，由光生成的价空穴引起的缓慢的水氧化过程是H2O2生成的主要障碍之一。上述困境可通过用牺牲剂（如苄胺）消耗孔洞来解决。本文合成了两种不同给受体（D-A）强度的乙烯连接共价有机框架（分别为TMBP-1和TMBP-2）。所构建的D-A结构促进了分子内电荷转移，从而增强了相应的光催化性能。令人印象深刻的是，当采用TMBP-2作为光催化剂，空气作为唯一氧化剂时，在环境条件下，5 h内可获得高效的苄胺偶联率（> 99.9%）， H2O2产量高达6.3 mmol g−1 h−1。总的来说，这项工作为光催化生产H2O2以及制造高附加值的化学中间体提供了一条绿色途径。

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引用次数: 0