A Multifunctional Polyurethane Containing UPy and PPG Side Chains Achieves Synergistic Reinforcement of Epoxy Adhesives Through an Interpenetrating Network

IF 3.6 4区工程技术 Q2 ENGINEERING, CHEMICAL

Polymer Engineering and Science Pub Date : 2025-07-01 DOI:10.1002/pen.70046

Hanxiao Rui, Wendong Lin, Zhibin Wang

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引用次数: 1

Abstract

ABSTRACT Conventional epoxy adhesives suffer from excessive brittleness and poor toughness due to their high crosslinking density, which severely limits their engineering applications. To address this, this study proposes a “dual‐network synergistic crosslinking” strategy. A functionalized polyurethane prepolymer terminated with UPy (dynamic hydrogen‐bonding units) and epoxy groups was designed and incorporated into a bisphenol‐A epoxy resin/anhydride curing system. The resulting composite adhesive achieves simultaneous enhancement in strength and toughness. After optimization, the material exhibits a shear strength of 27.73 MPa, tensile strength of 32.67 MPa, and impact strength of 31.4 kJ/m 2 , representing improvements of 118%, 106%, and 243%, respectively, compared to the pure epoxy system. The dynamic hydrogen‐bonding network (UPy‐epoxy interfacial interactions) and flexible PPG segments synergistically enhance toughness through energy dissipation and stress relaxation, while the stoichiometrically controlled dual‐network crosslinking structure ensures a balance between strength and toughness. This work provides an innovative solution to overcome the longstanding “strength‐toughness trade‐off” dilemma in epoxy adhesives.

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含UPy和PPG侧链的多功能聚氨酯通过互穿网络实现环氧胶粘剂的协同增强

传统环氧胶粘剂由于交联密度大，脆性过大，韧性差，严重限制了其工程应用。为了解决这个问题，本研究提出了一种“双网络协同交联”策略。设计了一种以动态氢键单元（UPy）和环氧基为末端的功能化聚氨酯预聚体，并将其加入到双酚A环氧树脂/酸酐固化体系中。所得到的复合胶粘剂在强度和韧性方面同时得到增强。优化后的材料抗剪强度为27.73 MPa，抗拉强度为32.67 MPa，冲击强度为31.4 kJ/ m2，比纯环氧树脂体系分别提高了118%、106%和243%。动态氢键网络（UPy -环氧界面相互作用）和柔性PPG段通过能量耗散和应力松弛协同增强韧性，而化学计量控制的双网络交联结构确保了强度和韧性之间的平衡。这项工作提供了一种创新的解决方案，克服了长期以来环氧胶粘剂的“强度-韧性权衡”困境。

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

Polymer Engineering and Science 工程技术-高分子科学

CiteScore

5.40

自引率

18.80%

发文量

329

审稿时长

3.7 months

期刊介绍： For more than 30 years, Polymer Engineering & Science has been one of the most highly regarded journals in the field, serving as a forum for authors of treatises on the cutting edge of polymer science and technology. The importance of PE&S is underscored by the frequent rate at which its articles are cited, especially by other publications - literally thousand of times a year. Engineers, researchers, technicians, and academicians worldwide are looking to PE&S for the valuable information they need. There are special issues compiled by distinguished guest editors. These contain proceedings of symposia on such diverse topics as polyblends, mechanics of plastics and polymer welding.