红外光谱法实时跟踪支化聚乙烯亚胺/甲基丙烯酸缩水甘油酯的官能团反应  

Real-Time Monitoring the Reactions of Functional Groups in Polyethyleneimine/Glycidyl Methacrylate System by FT-IR

作　　者：茅群龙 张艳[1,2] 张弢[1,2] 

机构地区：[1]南京大学现代工程与应用科学学院,江苏南京210093 [2]南京市微创伤介入医疗材料工程技术研究中心,江苏南京210093

出　　处：《高分子材料科学与工程》2013年第11期28-30,35,共4页Polymer Materials Science & Engineering

基　　金：江苏省科技支撑计划(社会发展)项目(BE2012735);国家重大科学研究计划(2011CB933400)

摘　　要：支化聚乙烯亚胺（PEI）与甲基丙烯酸缩水甘油酯（GMA）反应体系中，PEI的伯胺基可与GMA上的环氧基和双键发生竞争反应，两者的反应速率显著不同。以红外光谱中的GMA羰基吸收峰为基准，分别对GMA中的环氧基和双键的相对含量随反应时间的变化进行半定量研究，确定PEI中伯胺基与GMA中环氧基的反应活性远大于与双键的反应，在5 ℃～40 ℃温度区间内，温度升高会加速两组官能团之间的反应但更有利于环氧基与胺基的反应。这些结果证明，可以利用红外光谱这一简便的方法来半定量地跟踪反应过程并获得最优化的反应条件。Fourier transform infrared spectroscopy （FT-IR） was applied to real-time monitor the reactions of functional groups in polyethyleneimine/glycidyl methacrylate （PEI/GMA） system , to analyze the mechanism and the reactions kinetics. The variation of FT-IR spectra indicates that the primary amine group could react with both epoxy group and alkene group with different reaction rates. Using the transmittance FT-IR spectra of carbonyl group in GMA as a reference, the change of relative amounts and the amounts fluctuations of epoxy and alkene groups were semi-quantitatively determined with the reaction time. The results show that the epoxy group is more active than alkene group in the reaction system. Moreover, between 5 ℃ and 40 ℃ temperature range, heating could accelerate both reactions in favor of the reaction between epoxy and amine group. The results prove that FT-IR is a simple and effective method applied in the studies of reaction mechanisms and is helpful to confirm a suitable reaction condition.

关 键 词：官能团反应 支化聚乙烯亚胺 甲基丙烯酸缩水甘油酯 红外光谱 实时跟踪 

分 类 号：O657.33[理学—分析化学]