Confined polymerization: ARGET ATRP of MMA in the nanopores of modified SBA-15
Confined polymerization: ARGET ATRP of MMA in the nanopores of modified SBA-15
复制标题
限域聚合：改性 SBA-15 纳米孔中 MMA 的 ARGET ATRP
DOI：
10.1016/j.polymer.2017.02.031
复制
发表时间：
2017-04-07
期刊：
影响因子：
4.6
通讯作者：
Zhang, Faai
中科院分区：
文献类型：
--
作者：
Chen, Mingsen;Zhou, Hongwang;Zhang, Faai
首先用不同的硅烷偶联剂对介孔SBA-15进行表面改性，然后利用电子转移再生活化剂进行原子转移自由基聚合（ARGET ATRP），在介孔SBA-15的受限纳米孔中制备聚甲基丙烯酸甲酯（PMMA）。采用X射线粉末衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、氮气吸附测试、凝胶渗透色谱（GPC）、傅立叶变换红外光谱（FT-IR）、热重分析（TGA）、质子核磁共振（H-1 NMR）和差示扫描量热分析（DSC）对PMMA/SBA-15纳米复合材料和纳米孔内的PMMA进行了表征。分别结果表明，SBA-15的纳米孔可以作为纳米反应器，对MMA的聚合有很大的限制作用。在孔道中得到的PMMAs的形貌与SBA-15的本征结构相似。通过ARGET ATRP测试，与常规PMMA相比，孔内PMMA的热稳定性、分子量、等规度均显著提高，但多分散指数（PDI）值变宽，间规度降低。(C)2017爱思唯尔有限公司版权所有
Rod-like mesoporous SBA-15 silica particles were surface modified by different silane coupling agents firstly, then polymethyl methacrylate (PMMA) was prepared in the confined nanopores of the SBA-15 via activators regenerated by electron transfer for atom transfer radical polymerization (ARGET ATRP). The PMMA/SBA-15 nanocomposites and PMMAs inside the nanopores were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption measurements, gel permeation chromatography (GPC), fourier transform infrared spectroscopy (FT-IR), thermogravimetry analysis (TGA), proton magnetic resonance (H-1 NMR), and differential scanning calorimetry (DSC), respectively. The results demonstrated that the nanopores of SBA-15 could serve as nanoreactors and had great confinement effects on the MMA polymerization. The morphology of PMMAs obtained in the channels was similar to that of intrinsic structure of SBA-15. The thermal stability, molecular weights, isotacticity of PMMAs inside the pores were all increased significantly compared to the conventional PMMA by ARGET ATRP, while broadened the polydispersity index (PDI) values and reduced the syndiotacticity. (C) 2017 Elsevier Ltd. All rights reserved.