基于D-A反应的热可逆聚氨酯合成及其碳纤维复合材料的制备与性能  

Synthesis of thermoreversible polyurethane based on D-A reaction and preparation and properties of its carbon fiber composites

作　　者：闫欣悦 丁楠洋 王成忠[1,2] YAN Xinyue;DING Nanyang;WANG Chengzhong(College of Materials Sciences and Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Key Laboratory of Carbon Fiber and Functional Polymers,Beijing 100029,China)

机构地区：[1]北京化工大学、材料科学与工程学院,北京100029 [2]碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《复合材料学报》2024年第4期1914-1922,共9页Acta Materiae Compositae Sinica

摘　　要：以二异氰酸酯(MDI)、聚醚多元醇(PTMG)和2,5-呋喃二甲醇合成了含有呋喃结构的线型聚氨酯,与双马来酰亚胺基二苯甲烷(BMI)通过Diels-Alder反应制备了热可逆聚氨酯固化物,并制备了碳纤维单向复合材料。通过高温红外和DSC分析了聚氨酯树脂的热可逆行为,研究了树脂的溶解性、熔融再加工性及力学性能,分析了碳纤维复合材料的力学性能和动态机械性能。结果表明:热可逆聚氨酯固化物在热循环中有反复断键-交联行为,160℃左右可完成逆反应;采用高温溶剂溶解法或热熔法均可以进行再加工,再加工3次后仍能保持原有力学性能;碳纤维单向复合材料的层间剪切呈二次失效特点,层间剪切强度为34.85 MPa,玻璃化转变温度为93.73℃。The line type polyurethane containing furan rings was prepared by diisocyanate(MDI),polyether polyols(PTMG)and 2,5-furandimethanol.The cured thermoreversible polyurethane was synthesized by Diels-Alder reaction between bismaleimide(BMI)and the line type polyurethane containing furan rings,and the unidirectional carbon fiber composite was prepared.The thermal reversible behavior of the cured thermoreversible polyurethane was analyzed through high-temperature FTIR and DSC.The solubility,melt reprocessing ability and mechanical properties of the cured thermoreversible polyurethane were studied,the mechanical properties and dynamic mechanical properties of carbon fiber composites were also analyzed.The results show that the cured thermoreversible polyurethane has a repeated behavior of bond breaking and cross-linking during thermal cycling,and the reversible reaction is completed about 160℃.Both high-temperature dissolution process and hot-melt process can be used for reprocessing.After being reprocessed three times,the original mechanical properties of the cured thermoreversible polyurethane can still be maintained.The interlaminar shear of unidirectional carbon fiber composites was characterized by secondary failure,and the interlaminar shear strength is 34.85 MPa.The glass transition temperature of thermoreversible polyurethane is 93.73℃.

关 键 词：热可逆聚氨酯 D-A反应 复合材料 回收利用 二次失效 

分 类 号：TB332[一般工业技术—材料科学与工程]