氨基功能化聚丙烯的制备与性能

Preparation and Characterization of Amine-Functionalized Polypropylene

首先合成含有氨基保护官能团的单体{1-甲基-1[3-(1-甲基乙烯基)苯基]乙基}-氨基甲酸1,1-二甲基乙酯(TMITBC),并将其接枝到聚丙烯(PP)上,然后通过脱保护反应得到侧链上含有氨基官能团的PP改性聚合物。采用傅里叶变换红外光谱仪、旋转流变仪、差示扫描量热仪和接触角测试研究了单体用量对PP接枝率、产物的流变性能、熔融与结晶行为和亲水性的影响,重点研究了氨化前后功能性聚合物各性能的改变。结果表明,TMITBC单体成功接枝到PP链上;PP接枝率随着TMITBC含量的增加先增加后降低;当TMITBC含量较小时,接枝聚合物的复数黏度变化不大,TMITBC量较大时,复数黏度显著降低,氨化后复数黏度相应有所增加;接枝改性后的PP相比于纯PP结晶温度有所升高,熔融温度有所降低,亲水性有所增加并且氨化之后的亲水性更好。

The amine-protected monomer { 1-methyl-1[3-（ 1-methylethylenyl） phenyl]ethyl}-carbamic acid 1,1-dimethylethyl ester（ TMITBC） was prepared and grafted onto polypropylene（ PP） backbone and the deprotection processing was used to obtain the amine-functionalized PP. The effect of TMITBC content on the grafting ratio of TMITBC was studied by Fourier transform infrared spectroscopy（ FT-IR）. The rheological,thermal and hydrophilic properties of the functionalized PPs were analyzed in detail. The results show that TMITBC is successfully grafted onto the PP backbone. With the increase of TMITBC content,the grafting ratio increases first and then decreases. The complex viscosity of the functionalized PPs changes very slightly with low TMITBC contents,and considerably reduces with high TMITBC contents.Meanwhile,the zero shear viscosity of the amine-functionalized PPs is higher than that of corresponding TMITBC-functionalized PP. Besides,functional PPs have higher crystallization temperature and lower melting temperature compared with pure PP. The hydrophilicity of amine-functionalized PP is superior to that of pure PP and corresponding TMITBCfunctionalized PP.