Overlooked Impact of Interchain H-Bonding between Cross-Links on the Mechanical Properties of Thermoset Polyurethane Elastomers

IF 5.1 1区化学 Q1 POLYMER SCIENCE

Macromolecules Pub Date : 2022-10-02 DOI:10.1021/acs.macromol.2c00873

Zhishuai Geng, Aimin Pang, Tengfei Ding, Xiaoyan Guo, Rongjie Yang, Yunjun Luo and Jinxian Zhai*,

引用次数: 7

Abstract

Thermoset polyurethane elastomers made from poly(3,3-bis(azidomethyl) oxetane with tetrahydrofuran) and various multifunctional isocyanate cross-linkers were compared to uncover a new mechanism of modulating the mechanical properties. Extra hydrogen bonding motifs, such as urethane or urea, were built in the cross-linkers and were proved to essentially determine the stiffness and toughness of the elastomers, while the covalent cross-linking densities of both networks were controlled strictly at the same level. The impact of interchain H-bonding on the mechanical properties of the polyurethane thermoset was unprecedently emphasized and supported by evidence from Fourier-transform infrared spectroscopy (FTIR), dynamic mechanical analysis (DMA), and low-field nuclear magnetic resonance (LFNMR).

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交联间h键对热固性聚氨酯弹性体力学性能的影响

比较了由聚(3,3-双(叠氮多甲基)氧乙烷与四氢呋喃)和各种多功能异氰酸酯交联剂制成的热固性聚氨酯弹性体，揭示了调节力学性能的新机制。额外的氢键基序，如聚氨酯或尿素，被建立在交联剂中，并被证明基本上决定了弹性体的刚度和韧性，而两个网络的共价交联密度被严格控制在同一水平。傅里叶变换红外光谱(FTIR)、动态力学分析(DMA)和低场核磁共振(LFNMR)的证据前所未有地强调和支持了链间氢键对聚氨酯热固性材料力学性能的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Macromolecules 工程技术-高分子科学

CiteScore

9.30

自引率

16.40%

发文量

942

审稿时长

2 months

期刊介绍： Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.