热重-傅立叶变换红外光谱联用法研究超支化聚氨酯/丙烯酸酯的热性能及热分解机理  

Study on Thermal Properties and Thermal Decomposition Mechanism of Hyperbranched Polyurethane Acrylate by TG-FTIR

作　　者：孙宁[1,2] 陈婵[1] 冯春云[1] 李亦彪[1] 

机构地区：[1]五邑大学化学与环境工程学院,广东江门529020 [2]江门职业技术学院,广东江门529090

出　　处：《分析测试学报》2015年第8期887-893,共7页Journal of Instrumental Analysis

基　　金：国家自然科学基金项目(21302146);广东省自然科学基金项目(S2013010015010);广东省部产学研结合重点项目(2012B091000077);江门市科技计划项目(江财工[2012]248号)

摘　　要：采用热重分析仪(TG)和差示扫描量热仪(DSC)对自制的超支化聚氨酯(HPU)和UV固化超支化聚氨酯丙烯酸酯(HPUA)在不同气氛下的热失重行为和玻璃化转变温度(Tg)进行分析,在此基础上,结合热重红外联用仪(TG-FTIR)探究了HPU和HPUA的热分解机理。热重分析结果表明:HPU和HPUA在氮气气氛下具有相似的热分解行为,均有3段热分解温度;在空气气氛下的热分解与氮气气氛下的热分解相比,其分解行为相似,但前者的分解更迅速。DSC分析表明:接入丙烯酸羟乙酯(HEA)后,HPUA的Tg明显低于HPU。热红联用对热分解机理的分析表明:空气气氛下的分解比氮气气氛下更迅速,降解更完全。HPU的3段热分解分别为:醇的降解、氨基甲酸酯键的降解、脲基键的降解;HPUA的3段热分解分别为:丙烯酸羟乙酯的降解、氨基甲酸酯键的降解、脲基键的降解。The thermo-gravimetric behaviors under different atmosphere and glass transmission temperature （Tg） of self-made hyperbranehed polyurethane （HPU） and UV -curable hyperbranched poly-urethane acrylate （HPUA） were analysised with thermogravimetric analyzer （TG） and differential scanning calorimeter （DSC）. On this basis, the thermal decomposition mechanisms of HPU and HPUA were investigated with the combination of themogravimetric analyzer and Fourier transform infrared spectrometer（ TG- FTIR）. The TG results demonstrated that HPU and HPUA had a simtlar thermal degration behavior, both presenting three thermal degration plateforms. Comparing the decomposition behaviors of two compounds under air and nitrogen, their decomposition behaviors were found to be similar, but the former was more quick. DSC analysis indicated that when adding HEA, the Tg of HPUA was obviously lower than that of HPU. TG - IR analysis demonstrated that, compared to that under nitrogen atmosphere, HPU and HPUA decomposed more rapidly and thoroughly under air. The thermal decomposition mechanism of HPU was degradations of alcohol, urethane bond and ureido bond, respectively, and the thermal decomposition mechanism of HPUA was decomposition of hydroxyethyl acrylate, urethane bonds and ureido bond, respectively.

关 键 词：热重红外联用仪(TG-FTIR) 超支化聚氨酯丙烯酸酯 玻璃化转变温度 热分解机理 

分 类 号：O657.3[理学—分析化学] O632[理学—化学]