含酮羰基热固性液晶聚芳酯的设计合成与性能  

Design,synthesis and properties of liquid crystal polyarylate thermosets containing ketone carbonyl groups

作　　者：韩雨菲 刘萍 庄耀中 胡兴其 姚敏刚 管清宝 游正伟[1] HAN Yufei;LIU Ping;ZHUANG Yaozhong;HU Xingqi;YAO Mingang;GUAN Qingbao;YOU Zhengwei(College of Materials Science and Engineering,State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University,Shanghai,China;Xinfengming Group Co.,Ltd.,Tongxiang,Zhejiang,China)

机构地区：[1]东华大学材料科学与工程学院,纤维材料改性国家重点实验室,上海 [2]新凤鸣集团股份有限公司,浙江桐乡

出　　处：《东华大学学报（自然科学版）》2024年第4期68-75,共8页Journal of Donghua University(Natural Science)

基　　金：国家自然科学基金(52073049);国家重点研发计划(2021YFC2101800)。

摘　　要：液晶聚芳酯(LCPs)具有优异的热稳定性和力学性能,被广泛应用于航空航天、电子工业等前沿领域,但LCPs面临高熔点(t_(m)>350℃)所带来的加工难题。利用活性端基苯炔基封端LCPs主链,在不破坏液晶性的基础上有效调控分子量并降低聚合物熔点,获得综合性能优异的液晶聚芳酯固化物(LCTs);调控的主链结构可进一步调控LCTs的热学性能。通过一步熔融缩聚法合成由对羟基苯甲酸(HBA)、对苯二甲酸(TA)、对苯二酚(HQ)、4,4'-二羟基二苯甲酮(DHBP)和2,6-萘二甲酸(NDA)构成主链并由苯炔基封端的LCTs。为进一步研究酮羰基与LCTs热学性能的关系,调节HQ与DHBP的比例合成一系列LCTs。结果表明:制得的LCTs均具有高热稳定性(t_(d,5%)>470℃)、典型向列相液晶纹影织构与取向微纤形貌;酮羰基的引入影响分子链的规整度及软硬段比例,随着酮羰基含量增多,LCTs的玻璃化转变温度降低。Liquid crystalline polyarylates(LCPs)have excellent thermal stability and mechanical properties,widely used in cutting-edge fields such as aerospace and electronics industries,but the existing LCPs still face the processing problems caused by high melting point(t_(m)>350℃).Liquid crystal polyarylate thermosets(LCTs)with excellent overall performance are obtained using the reactive end-group phenynyl to encapsulate the main chain of LCPs,effectively regulating the molecular weight and lowering the melting point of the polymers without destroying the liquid crystallinity.The thermal properties of LCTs can be further regulated by modulating the main chain structure.LCTs consisting of p-hydroxybenzoic acid(HBA),terephthalic acid(TA),hydroquinone(HQ),4,4'-dihydroxybenzophenone(DHBP)and 2,6-naphthalene dicarboxylic acid(NDA)were synthesized by one-pot melt polycondensation reaction.A series of LCTs were synthesized by adjusting the ratio of HQ to DHBP to further study the relationship between ketone carbonyl groups and LCTs.The results show that the prepared LCTs have high thermal stability(t_(d,5%)>470℃),typical nematic schlieren textures and oriented microfiber morphology.The addition of ketone carbonyl groups affected the regularity of molecular chain and the proportion of soft and hard segments.With the increase of ketone carbonyl groups content,the glass transition temperature of LCTs decreased.

关 键 词：液晶聚芳酯 酮羰基 苯炔基 熔融缩聚 高性能聚合物 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]