论文部分内容阅读
用马来酸酐在常温条件下对端羟基聚丁二烯进行扩链,通过黏度法测定了扩链前后端羟基聚丁二烯的相对平均分子质量,并用傅立叶变换红外光谱、核磁共振谱对扩链前后端羟基聚丁二烯的结构进行了表征。结果表明,扩链后相对平均分子质量增大至原来相对平均分子质量的1.46倍,在傅立叶变换红外光谱图上显示出较强的酯基伸缩振动吸收峰(1735cm-1),同时也用核磁共振谱排除了乙醇的酯化,这说明端羟基聚丁二烯的扩链不是简单的端羟基转变为端羧基,而是酯化反应。
The maleic anhydride was used to chain-extend the hydroxyl-terminated polybutadiene at room temperature. The relative average molecular weight of the hydroxyl-terminated polybutadiene before and after the chain extension was determined by viscosity method. The relative molecular mass of the hydroxyl-terminated polybutadiene was determined by Fourier transform infrared spectroscopy The structure of the hydroxyl-terminated polybutadiene before and after the chain was characterized. The results showed that the relative average molecular weight of the chain extended to 1.46 times of the original average molecular weight after the chain extension, and showed a strong absorption peak (1735cm-1) of the ester group stretching vibration on the Fourier transform infrared spectroscopy. At the same time, Resonance spectrum to exclude the esterification of ethanol, which shows that the terminal hydroxy-terminated polybutadiene chain is not a simple terminal carboxyl into carboxyl, but the esterification reaction.