采用聚四氢呋喃(PTMO)与马来酸酐(MA)合成了羧基封端聚四氢呋喃(PTAC),将PTAC与环氧树脂(EP)共固化制备了PTAC/EP形状记忆复合材料。对其热性能、力学性能及形状记忆性能进行了表征,探究了固化温度(75℃和129℃)及PTAC含量对材料性能的影响。结果表明:两种固化温度下的PTAC/EP复合材料的热分解温度都在325℃以上,相较于未改性EP,PTAC/EP复合材料的最大热分解速率温度上升40℃,热稳定性良好;随着固化温度的升高,PTAC/EP复合材料的拉伸强度增加,断裂伸长率降低;随着PTAC含量的增加,PTAC/EP复合材料的韧性增加,75℃固化的50% PTAC/EP复合材料的断裂伸长率达139.35%;动态热机械分析(DMA)测试表明PTAC/EP复合材料的玻璃化转变温度在45～70℃范围内可调节;经过3次形状记忆循环测试后,129℃固化的PTAC/EP复合材料的形状固定率和形状回复率都大于129℃下固化的PTAC/EP复合材料,其PTAC含量为5%～40%的形状固定率均在95%以上。
Carboxyl-terminated polytetrahydrofuran (PTAC) was synthesized from polytetrahydrofuran (PTMO) and maleic anhydride (MA),and PTAC/EP shape memory composites were prepared by co-curing PTAC with epoxy resin (EP).The thermal,mechanical,and shape memory properties were characterized,and the effects of curing temperatures (75℃ and 129℃) and PTAC content on the material properties were investigated.The results showed that the thermal decomposition temperatures of PTAC/EP composites at both curing temperatures were above 325℃,and the maximum thermal decomposition rate temperature of PTAC/EP composites increased by 40℃ compared with that of unmodified EP,with good thermal stability.The tensile strength of PTAC/EP composites increased and the elongation at break decreased with the increase of curing temperature.With the increase of PTAC content,the toughness of PTAC/EP composites increased,and the elongation at break of 50% PTAC/EP composites cured at 75℃ reached 139.35%.Dynamic thermo-mechanical analysis (DMA) tests revealed that the glass transition temperature of PTAC/EP composites could be adjusted within the range of 45～70℃.After three shape memory cycling tests,the shape fixation rate and shape recovery rate of PTAC/EP composites cured at 129℃ were both higher than those of PTAC/EP composites cured at 129℃.For PTAC content ranging from 5% to 40%,the shape fixation rates were both greater than 95%.
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基金资助
国家自然科学基金(52171149)
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