Biobased, reprocessable and weldable epoxy vitrimers from epoxidized soybean oil
Biobased, reprocessable and weldable epoxy vitrimers from epoxidized soybean oil
复制标题
由环氧化大豆油制成的生物基、可再加工和可焊接的环氧玻璃体
DOI：
10.1016/j.indcrop.2020.112576
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发表时间：
2020-10-01
影响因子：
5.9
通讯作者：
Zeng, Jian-Bing
中科院分区：
文献类型：
--
作者：
Liu, Yu-Yao;He, Jia;Zeng, Jian-Bing
由植物油如环氧大豆油（ESO）制备的生物基聚合物由于其永久交联结构而不能再加工或回收。本文报道了以4,4′-二硫代二苯胺（APD）为固化剂，对ESO进行无催化剂固化，合成了ESO衍生的玻璃聚合物（ESOVs）。由固化时间控制的交联密度对ESOV的力学性能影响很大。随着交联密度的增加，ESOV的抗拉强度逐渐增大，断裂伸长率逐渐降低。APD的动态二硫键通过二硫键交换反应的网络拓扑重排，赋予了ESOV优异的可再加工性和可焊性。经过多次切割和压成型后，ESOV的力学性能、凝胶分数和化学结构基本保持不变。将断裂的两个ESOV部件焊接在一起也完全恢复了ESOV的力学性能。该研究为从可持续植物油中设计新型功能材料提供了一种简单而有前途的策略。
Biobased polymers prepared from vegetable oils such as epoxidized soybean oil (ESO) cannot be reprocessed or recycled due to the permanent crosslink structure. Herein, we report ESO derived vitrimers (ESOVs) synthesized by catalyst-free curing of ESO with 4, 4'-dithiodiphenylamine (APD) as a curing agent. The crosslink density controlled by curing time affect the mechanical properties of ESOV strongly. The tensile strength increased and elongation at break decreased gradually with increasing crosslink density of ESOV. The dynamic disulfide linkages of APD imparted the ESOV with excellent reprocessability and weldability via network topology rearrangement as a result of exchange reaction of disulfide bonds. The mechanical properties, gel fraction and chemical structure of ESOV almost remained unchanged after repeatedly cutting and compression molding for several times. The mechanical properties of ESOV were also recovered completely when two broken parts of ESOV were welded together. This study provides a facile and promising strategy to design novel functional materials from sustainable vegetable oils.