文献类型：期刊文献

中文题名：PBT聚醚聚氨酯不同活泼氢组分固化体系研究

英文题名：Curing Systems of PBT Polyether Polyurethane with Different Active Hydrogen Components

作者：苏雅琪[1];王卫泽[1];杨敏[1];杨茜茜[1];轩福贞[1]

机构：[1]华东理工大学机械与动力工程学院,上海200237

年份：2023

卷号：49

期号：3

起止页码：376

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：Scopus;北大核心:【北大核心2020】；CSCD:【CSCD_E2023_2024】；

语种：中文

中文关键词：PBT推进剂;固化反应;反应动力学;力学性能;活泼氢

外文关键词：PBT propellant;curing reaction;reaction kinetics;mechanical property;active hydrogen

摘要：以3,3-双叠氮甲基氧杂环丁烷-四氢呋喃共聚醚(PBT)为聚醚聚氨酯的软段、甲苯-2,4-二异氰酸酯(TDI)为固化剂、一缩二乙二醇(DEG)为扩链剂、三羟甲基丙烷(TMP)为交联剂,利用二步法制备了不同活泼氢组分的PBT聚醚聚氨酯。采用傅里叶变换红外光谱(FT-IR)仪、差示扫描量热(DSC)仪、电子万能试验机及溶胀率测试仪,对PBT/TDI、PBT/TDI/DEG、PBT/TDI/TMP/和PBT/TDI/DEG/TMP体系进行了固化反应动力学及力学性能的研究。结果表明:PBT/TDI、PBT/TDI/DEG、PBT/TDI/TMP/和PBT/TDI/DEG/TMP体系的固化反应均为二级反应,活化能分别为135.984、165.573、164.933、164.292 kJ/mol。加入DEG可显著提高黏合剂基体的断裂伸长率,但拉伸强度下降;加入TMP能提高黏合剂基体的拉伸强度,但断裂伸长率下降;同时加入DEG和TMP的黏合剂基体拉伸强度提高,断裂伸长率有所下降。DEG和TMP能不同程度地提高固化体系的交联密度。
PBT polyether polyurethanes with different active hydrogen components were prepared by a two-step method using 3,3-diazymoxy-tetrahydrofuran copolymer(PBT)as the soft segment of polyether polyurethanes,toluene diisocyanate(TDI)as the curing agent,diethylene glycol(DEG)as the chain extender and trimethylol propane(TMP)as the crosslinking agent.The curing reaction kinetics and mechanical properties of PBT/TDI,PBT/TDI/DEG,PBT/TDI/TMP and PBT/TDI/DEG/TMP systems were studied by Fourier Transform Infrared Spectroscopy(FT-IR),Differential Scanning Calorimeter(DSC),electronic universal testing machine and swelling ratio test.The results show that the curing reactions of PBT/TDI,PBT/TDI/DEG,PBT/TDI/TMP/and PBT/TDI/DEG/TMP systems are second-order reactions,and the activation energies of these systems are 135.984,165.573,164.933 and 164.292 kJ/mol,respectively.The addition of DEG can significantly increase breaking elongation of the adhesive matrix,but the tensile strength decreases;The addition of TMP can improve the tensile strength of the adhesive matrix and reduce breaking elongation;when DEG and TMP exist simultaneously,the tensile strength of the adhesive matrix increases and the elongation at break decreases.DEG and TMP can both improve the crosslinking density of the curing systems.