文献类型：期刊文献

英文题名：Catalyst-regulated network topology and performance in thermoplastic polyester ether elastomer-based vitrimers

作者：Wu, Qiao[1]; Li, Haiyang[1]; Lu, Jiawei[1]; Su, Zhongyuan[1]; Liu, Tao[1]

机构：[1] Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2026

卷号：359

外文期刊名：Polymer

收录：EI(收录号：20262220781755)

语种：英文

外文关键词：Catalysts - Crosslinking - Crystallization - Dynamics - Electric network topology - Network topology - Phase interfaces - Reinforced plastics - Thermoplastic elastomers

摘要：In this work, we prepared a series of Thermoplastic polyester ether elastomer (TPEE) vitrimers via a one-pot method using commercial linear TPEE as the matrix, an epoxy-functionalized crosslinker, and four different transesterification catalysts. The effects of catalysts on the crosslinked network structure, crystallization behavior, dynamic mechanical properties, rheological characteristics, and sustainable mechanical performance were systematically investigated. Results demonstrated that all catalysts effectively promoted the formation of dynamic crosslinked networks, and the different catalytic pathways played a critical role in determining the network topology. The different attack pathways lead the catalysts to exhibit different catalytic preferences toward the ester bonds in the TPEE hard segments and the soft-hard interface. which endows the vitrimers with distinct material properties. With its crosslinking sites more concentrated at the phase interface, the zinc acetate system better retains the regularity of the hard-segment structure and exhibits the lowest activation energy (18.97 kJ/mol) among the four catalysts. Moreover, the presence of the dynamic crosslinked network improved the processability and recyclability of the samples. This work confirms that catalyst selection and formulation design enable precise control over material properties, providing a new strategy for developing high-performance sustainable polymer materials. ? 2026 Elsevier Ltd