High-Strength and Excellent Self-Healing Polyurethane Elastomer Based on Rigid Chain Segment Reinforcement

IF 5.2 1区化学 Q1 POLYMER SCIENCE Macromolecules Pub Date : 2025-01-24 DOI:10.1021/acs.macromol.5c00013

Li-Quan Huang, Hua-Xin Huang, Ning Yu, Chang-Zhou Chen, Yang Liu, Guo-Hua Hu, Jun Du, Hui Zhao

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Abstract

Owing to their extensive application scope, elastomers that combine high strength and excellent self-healing efficiency have always attracted significant attention and are still a contradiction. In this study, a novel PU elastomer was prepared by combining rigid poly(amic acid) (PAA) chain segments and 3,3-dithiodipropionic dihydrazide (DPH) containing sextuple hydrogen-bonding units and disulfide bonds. The prepared elastomer exhibited a high tensile strength of 50.1 MPa and a high toughness of 144.2 MJ/m³. The rigid PAA chain segments serve as a rigid framework, significantly enhancing the mechanical strength of the elastomer. Meanwhile, DPH with sextuple hydrogen-bonding units and disulfide bonds enabled the elastomer to exhibit an excellent self-healing efficiency of 96.1% after 12 h at 80 °C. Additionally, the strong and reversible cross-linking of the hydrogen-bonding arrays in the elastomer endows it with excellent mechanical strength, self-healing ability, and recyclability, allowing it to be recycled after hot pressing and dissolution.

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基于刚性链段加固的高强度优异自愈聚氨酯弹性体

弹性体由于其广泛的应用范围，结合了高强度和优异自愈效率的弹性体一直备受关注，但仍是一个矛盾。本研究将刚性聚酰胺（PAA）链段与含有六重氢键和二硫键的3,3-二硫代二丙酸二肼（DPH）结合制备了一种新型PU弹性体。制备的弹性体抗拉强度为50.1 MPa，韧性为144.2 MJ/m3。刚性PAA链段作为刚性框架，显著提高弹性体的机械强度。同时，具有六个氢键单元和二硫键的DPH使弹性体在80℃下经过12 h后表现出96.1%的优异自愈效率。此外，弹性体中氢键阵列的强可逆交联使其具有优异的机械强度、自愈能力和可回收性，使其在热压和溶解后可回收利用。

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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.