SiO_2表面原位接枝聚环氧丙烷高分子刷的制备及表征  

Preparation and characterization of polypropylene oxide polymer brushes grafted SiO_2 by in-situ polymerization

作　　者：曹芬[1,2] 陈可平[2] 田春蓉[2] 林晓艳[1] 梁书恩[2] 贾晓蓉[2] 王建华[2] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]中国工程物理研究院化工材料研究所,四川绵阳621900

出　　处：《化工学报》2017年第1期430-436,共7页CIESC Journal

基　　金：国家自然科学基金项目(51273183);国家自然科学基金委员会与中国工程物理研究院联合基金项目(U1530144)~~

摘　　要：通过"Stober"法制备出单分散球形SiO_2粒子,并采用3-缩水甘油醚氧基丙基三甲氧基硅烷对其表面进行功能化修饰,然后,利用异丙醇铝作为多相催化剂,原位引发环氧丙烷(PO)单体开环聚合,制得了聚环氧丙烷(PPO)高分子刷接枝改性的SiO_2(PPO-g-SiO_2)。研究了单体添加量、反应温度及反应时间等因素对聚环氧丙烷高分子刷接枝量的影响规律。采用红外光谱(FT-IR)、X射线光电子能谱(XPS)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)及热重分析(TGA)等分析方法对制备的PPO-g-SiO_2的化学结构、微观形貌以及接枝量进行了表征。结果显示,当单体添加量为2.38 mol·L^(-1),反应温度为80℃,反应时间为24 h时,PPO在SiO_2表面的接枝量可达23.56%(质量分数);其厚度约为15 nm。Monodispersed spherical SiO2 particles were successfully prepared by Stober method, and the functional modification of SiO2 was obtained by the reaction of Si—OH with 3-glycidoxypropyltrimethoxysilane（GPS）. By using aluminum isopropoxide as a heterogeneous catalyst to initiate in-situ ring-opening polymerization of the propylene oxide（PO） monomers, a polypropylene oxide（PPO） polymer brush grafted SiO2（PPO-g-SiO2） was obtained. The effects of the amount of monomer, reaction temperature and reaction time on the grafted polymer brushes were discussed. In addition, the chemical structure and morphology of PPO-g-SiO2 and grafted amount were characterized by Fourier transform infrared spectroscopy（FT-IR）, X-ray photoelectron spectroscopy（XPS）, transmission electron microscopy（TEM）, scanning electron microscope（SEM） and thermogravimetric analysis（TGA）. The results show when the amount of the monomer addition is 2.38 mol·L-1, reaction temperature is 80℃, and reaction time is 24 h, respectively, the PPO graft quantity is up to 23.56%（mass） on SiO2 surface and the thickness is about 15 nm.

关 键 词：二氧化硅 显微结构 化学反应 聚环氧丙烷 开环聚合 高分子刷 

分 类 号：O633.1[理学—高分子化学]