端叠氮基超支化聚酯的合成与表征

Synthesis and Characterization of Azido-Terminated Hyperbranched Polyester

以三羟甲基丙烷为核、对甲苯磺酸为催化剂,2,2-二羟甲基丙酸缩聚为端羟基超支化聚酯,端羟基先后经磺酰化改性和叠氮基取代后得到端叠氮基超支化聚酯。利用红外光谱、核磁共振、元素分析、凝胶色谱等方法对目标产物进行了结构表征和确认;在此基础上,对目标产品进行了热重(TG)和差示扫描量热(DSC)表征。结果表明:端叠氮基超支化聚酯的支化度为0.45;热分解分为两个阶段,分别是端叠氮基热分解(249.4℃)和主链热分解(350℃);玻璃化转变温度为-55.2℃。

Taking p-toluenesulfonic acid as catalyst,trimethylolpropane as core,the hydroxy-terminated hyperbranched polyester was synthesized by condensation polymerization of 2,2-dimethylol propionic acid.Then,the azido-terminated hyperbranched polyester was synthesized by sulfonation and azidotion of the terminal hydroxy group in succession.The structures of the target hyperbranched polyester were characterized and verified by infrared spectrum（IR）,C-nuclear magnetic resonance spectrum（NMR）,gel permeation in chromatography（GPC） and elemental analysis.The thermal properties of azido-terminated hyperbranched polyester were characterized by thermogravimetry（TG） and differential scanning calorimetry（DSC）.Results show that the degree of branching of azido-terminated hyperbranched polyester is 0.45.The thermal decomposition of azido-terminated hyperbranched polyester has two stages.The first stage is the decomposition of the terminal azido（249.4 ℃） and the second stage is the decomposition of the main chain（350 ℃）.The glass transition temperature of azido-terminated hyperbranched polyester is-55.2 ℃.