气体响应性聚合物接枝二氧化硅的设计与制备

Design and Preparation of Gas Responsive Polymer Grafted Silica

采用改进的溶胶-凝胶法制备SiO_(2)微球,选择正硅酸乙酯为实验原料,氨水为催化剂,在SiO_(2)微球表面进行接枝聚合,制得气体响应性聚合物。利用傅里叶转换红外光谱仪(FT-IR)表征SiO_(2)微球及其接枝聚合物的结构特征、扫描电子显微镜(SEM)表征SiO_(2)微球及其接枝聚合物的形貌特征、热失重分析(TG)表征SiO_(2)微球接枝聚合物的接枝率、动态光散射仪(DLS)测量SiO_(2)微球和气体响应性聚合物的粒径及分布;通过Zeta电位变化验证接枝聚合物的气体响应性和循环稳定性。结果表明,向聚合物中通入CO_(2)气体可以使Zeta电位值发生突变,再通入N_(2)则Zeta电位得到恢复,证明了制得的接枝聚合物具有气体响应性和循环稳定性。实验结果为设计和制备SiO_(2)微球气体响应性聚合物提供了有益的参考。

The modified sol-gel method was used to prepare SiO_(2) microspheres.Ethyl orthosilicate was selected as the experimental raw material,ammonia as the catalyst,and graft polymerization was carried out on the surface of SiO_(2) microspheres to prepare gas responsive polymers.Fourier transform infrared spectroscopy(FT-IR)was used to characterize the structural characteristics of SiO_(2) microspheres and their grafted polymers,scanning electron microscopy(SEM)was used to characterize the morphological characteristics of SiO_(2) microspheres and their grafted polymers,thermal gravimetric analysis(TG)was used to characterize the grafting rate of SiO_(2) microspheres and their grafted polymers,and dynamic light scattering(DLS)was used to measure the particle size and distribution of SiO_(2) microspheres and gas responsive polymers;The gas responsiveness and cyclic stability of the grafted polymer were verified by Zeta potential changes.The results show that introducing CO_(2) gas into the polymer can cause a sudden change in the Zeta potential value,and then adding N_(2) can restore the Zeta potential,which proves that the prepared graft polymer has gas responsiveness and cycle stability.The experimental results provide a useful reference for the design and preparation of SiO_(2) microsphere gas responsive polymers.