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Synthesis and performance of flexible epoxy resin with long alkyl side chains via click reaction
Author(s) -
Dai Xueyan,
Li Peihong,
Sui Yanlong,
Zhang Chunling
Publication year - 2021
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20210044
Subject(s) - epoxy , thermosetting polymer , curing (chemistry) , materials science , side chain , toughness , composite material , alkyl , click chemistry , polymer , polymer chemistry , chemistry , organic chemistry
Epoxy resin is a thermosetting polymer with excellent performance and wide application. However, it suffers from low toughness and high brittleness because of its high crosslink density. To overcome these disadvantages, this study synthesizes a toughened, flexible, and hydrophobic epoxy resin (DGEBDBP) by introducing a flexible segment into the polymer network via a thiol‐ene click reaction. The cured flexible epoxy resin is obtained by mixing E44, DGEBDBP, and polyamide curing agents of varying contents. The long alkyl side chains significantly improve the mechanical properties and hydrophobicity of the cured epoxy resin. The sample containing 75% DGEBDBP and 25% E44 achieve the highest breaking elongation that was nine times that of pure E44, the highest compressive strength of 112.8 MPa, and the highest contact angle of 101.4°. The introduction of side chains through the thiol‐ene click reaction can provide a simple and effective method for designing and preparing multifunctional epoxy resins.