玻璃化转变
热固性聚合物
环氧树脂
材料科学
单体
复合材料
聚合物
酯交换
模数
应力松弛
高分子化学
催化作用
有机化学
化学
蠕动
作者
Tuan Liu,Cheng Hao,Shuai Zhang,Xiaoning Yang,Liwei Wang,Jiarui Han,Yuzhan Li,Junna Xin,Jinwen Zhang
出处
期刊:Macromolecules
[American Chemical Society]
日期:2018-07-18
卷期号:51 (15): 5577-5585
被引量:269
标识
DOI:10.1021/acs.macromol.8b01010
摘要
The design of high glass transition temperature (Tg) thermoset materials with considerable reparability is a challenge. In this study, a novel biobased triepoxy (TEP) is synthesized and cured with an anhydride monomer in the presence of zinc catalyst. The cured TEP exhibits a high Tg (187 °C) and comparable strength and modulus to the cured bisphenol A epoxy. By adopting the vitrimer chemistry, the cross-linked polymer materials are imparted significant stress relaxation and reparability via dynamic transesterification. It is noted that the reparability is closely related to the repairing temperature, external force, catalyst content, and the magnitude of rubbery modulus of the sample. The width of the crack from the cured TEP can be efficiently repaired within 10 min. This work introduces the first high-Tg biobased epoxy material with excellent reparability and provides a valuable method for the design of high-Tg self-healing materials suitable for high service temperature.
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