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以3,3-叠氮甲基环氧丁烷-四氢呋喃(PBT)为起始聚醚,三官能度的支化单元为引发剂,在催化剂的作用下,通过亲核加成反应合成一种具有新型支化结构的PBT(B-PBT)。采用FTIR、~1H-NMR、粘度测试、DSC、TG和拉伸测试,对目标产物的结构、粘度特征、热稳定性以及力学性能进行表征。结果表明,所合成的目标产物为具有支化结构的叠氮缩水甘油醚;B-PBT的粘度(15 000 mPa·s/50℃)明显低于PBT(23 828 mPa·s/50℃);引入支化单元后,B-PBT热稳定性仍保持良好,放热达到1481 J/g;产物热分解分为两个阶段,即叠氮基热分解、支化单元以及主链的断裂和小分子的热解;制备的B-PBT弹性体拉伸强度达到5.29 MPa,延伸率达到516.42%,力学性能良好。
Using 3,3-azidomethylbutylene oxide-tetrahydrofuran (PBT) as starting polyether and trifunctional branching unit as initiator, one kind of initiator was synthesized by nucleophilic addition reaction under the action of catalyst PBT with novel branched structure (B-PBT). The structure, viscosity characteristics, thermal stability and mechanical properties of the target product were characterized by FTIR, ~ 1H-NMR, viscosity test, DSC, TG and tensile test. The results showed that the target product was azide glycidyl ether with branched structure. The viscosity (15 000 mPa · s / 50 ℃) of B-PBT was obviously lower than that of PBT (23 828 mPa · s / 50 ℃) The thermal stability of B-PBT is still good and the exothermic temperature reaches 1481 J / g after the introduction of the branching unit. The thermal decomposition of the product is divided into two stages, namely the thermal decomposition of azide, the breaking of the branching unit and the main chain, and the small Molecular pyrolysis; prepared B-PBT elastomer tensile strength reached 5.29 MPa, elongation of 516.42%, good mechanical properties.