基于动态酯键的烷二胺基Vitrimer的制备及其性能研究

Preparation and Properties of Menthane Diamine Vitrimer Based on Dynamic Ester Bonds

利用烷二胺合成环氧化烷二胺(EMDA),与桐马酸酐(EMA)反应制备了基于动态酯交换机理的生物基类玻璃高分子(vitrimers)材料。通过傅里叶变换红外光谱(FT-IR)、动态热机械分析(DMA)、热重(TG)分析和万能试验测试机等仪器对材料进行表征及测试。实验结果显示:材料拉伸强度最高达到35 MPa,断裂拉伸率达到12%,5%质量损失温度最高达到264℃,玻璃化转变温度(T_(g))最高达到119℃,其交联密度随着环氧化烷二胺用量的增加先增加后降低;且材料具有基于T_(g)的形状记忆能力和在180℃发生交联结构拓扑重排的能力。通过乙醇胺与材料中酯键的反应实现材料的降解,并通过凝胶渗透色谱(GPC)证明材料在130℃反应8 h能够被降解为数均相对分子质量(M_(n))为2594,多分散性指数(PDI)为1.09的低聚物。

Bio-based glass-like polymer(vitrimers)materials based on dynamic transesterification mechanism were prepared by the adduct of eleostearic acid and maleic anhydride(EMA)and epoxidizing menthane diamine(EMDA)derived from menthane diamine(MDA).The obtained materials were characterized and tested by Fourier transform infrared spectroscopy(FT-IR),dynamic thermomechanical analysis(DMA),thermogravimetric(TG)analysis,universal testing machine and other testing methods.The experimental results showed that the tensile strength of the materials was up to 35 MPa,the elongation at break was up to 12%,the 5%weight loss temperature was up to 264℃,and the glass transition temperature(T_(g))was up to 119℃.The crossliking density increased first and then decreased with the increasing content of epoxidized menthane diamine.The materials had T_(g)-based shape memory ability and under went topological rearrangement of cross-linked structure at 180℃.The degradation of the material was achieved by the reaction of ethanolamine with the ester bond in the materials,and it was proved by gel permeation chromatography(GPC)that the materials could be degraded into oligomers with M_(n) of 2594 and PDI of 1.09 at 130℃for 8 h.