摘要
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-Bis （azidomethyl） oxetane/Tetrahydrofuran （PBT） as the starting polyether,branching unit of trifunctional as intiator,PBT with a branched structure （B-PBT） was synthesized by nucleophilic addition reaction under effect of a certain catalyst.The structure,viscosity properties,thermal stability and mechanical properties of the target product were characterized by FTIR,~1H-NMR,viscosity measurements,DSC,TG and tensile test.The results showed that the target product was a kind of azide ether with branched structure.The viscosity of B-PBT （15 000 m Pa·s/50 ℃） was significantly lower than that of PBT （23 828 m Pa·s/50 ℃）.The B-PBT has great thermal stability after branching units were introduced,where the decomposition heat release reached 1481 J/g.The thermal decomposition of B-PBT could be divided into two stages,namely thermal decomposition of the azido,scission of branching units and backbone into small molecules.Moreover,the B-PBT elastomers exhibits better mechanical properties （σb= 5.29 MPa,εb= 516.42%）.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2017年第5期609-613,共5页
Journal of Solid Rocket Technology
