CAJ | 학술논문

以端羟基聚丁二烯( HTPB)为引发剂,三氟化硼乙醚络合物为催化剂,环氧丙烷为促开环剂,通过四氢呋喃的阳离子开环聚合反应,制备出聚四氢呋喃-聚丁二烯-聚四氢呋喃三嵌段共聚物( PTHF-PB-PTHF)。采用红外光谱、核磁共振氢谱及碳谱、凝胶渗透色谱-激光光散射联用技术,对目标化合物的结构进行了表征。采用相对分子质量为8066 g/mol的PTHF-PB-PTHF与甲苯二异氰酸酯反应制备了交联弹性体,应力-应变试验显示,在相同交联密度下,PTHF-PB-PTHF交联弹性体的拉伸强度及断裂伸长率较纯HTPB交联弹性体分别提高了16%及19%。动态热机械性能分析表明,PTHF-PB-PTHF交联弹性体具有优异的粘弹性能,其玻璃化转变温度为-55.99℃,低于HTPB交联弹性体。
이단간기취정이희( HTPB)위인발제,삼불화붕을미락합물위최화제,배양병완위촉개배제,통과사경부남적양리자개배취합반응,제비출취사경부남-취정이희-취사경부남삼감단공취물( PTHF-PB-PTHF)。채용홍외광보、핵자공진경보급탄보、응효삼투색보-격광광산사련용기술,대목표화합물적결구진행료표정。채용상대분자질량위8066 g/mol적PTHF-PB-PTHF여갑분이이청산지반응제비료교련탄성체,응력-응변시험현시,재상동교련밀도하,PTHF-PB-PTHF교련탄성체적랍신강도급단렬신장솔교순HTPB교련탄성체분별제고료16%급19%。동태열궤계성능분석표명,PTHF-PB-PTHF교련탄성체구유우이적점탄성능,기파리화전변온도위-55.99℃,저우HTPB교련탄성체。
Poly( tetrahydrofuran)-poly( butadiene)-poly( tetrahydrofuran) triblock copolymer was synthesized by cationic ring-opening polymerization of tetrahydrofuran in the presence of hydroxyl-terminated polybutadiene as the macroinitiator,boron trifluo-ride etherate as the catalyst, and few amount of epoxy propane as the ring-opening assistant agent. The chemical structure of target copolymers was characterized by FTIR,1 H-NMR,13 C-NMR and SEC. Triblock copolymer with a molecular weight of 8 066 g/mol was used to prepare elastomer by reacting with TDI. Tensile test indicates that the tensile strength and elongation are increased by 16% and 19% respectively compared with that of elastomer based on HTPB when both are in the same crosslink density.Dynamic mechanical analysis( DMA) reveals that the triblock copolymer cured elastomer exhibits better elasticity and viscosity properties than HTPB,and the glass transition temperature is -55.99 ℃,which is lower than HTPB cured elastomer.