改性SBA-15介孔孔道内甲基丙烯酸甲酯的反向原子转移自由基聚合的溶液聚合  

Reverse Atom Transfer Radical Polymerization of Methyl Methacrylate in the Modified Mesoporous SBA-15

作　　者：周泓望 陈明森[1] 孙发孟[1] 张发爱[1] 

机构地区：[1]桂林理工大学材料科学与工程学院,广西桂林541004

出　　处：《高分子材料科学与工程》2017年第7期17-22,共6页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51263004)

摘　　要：分别使用硅烷偶联剂KH-151、KH-560、KH-570对介孔材料SBA-15进行改性,以改性前后的介孔材料作为"微反应器",在其内部进行了甲基丙烯酸甲酯(MMA)的反向原子转移自由基聚合(RATRP)。通过X射线衍射、氮气吸附-脱附测试、热重分析、差示扫描量热、凝胶渗透色谱、傅里叶变换红外光谱等手段对所得产物进行了测试表征。结果表明,MMA在改性前后的SBA-15内部聚合成功;聚合后的复合材料仍然保持其SBA-15的母体结构,但比表面积、孔径、孔体积均有所下降;孔道内所得的PMMA较常规RATRP聚合所得的PMMA相对分子质量有所增加,相对分子质量分布变宽,初始热分解温度升高,玻璃化转变温度升高;改性后介孔材料对反应液有更好的吸附能力且对孔道内的MMA的RATRP溶液聚合有更强的孔道限制作用。Mesoporous SBA-15 was modified with silane coupling agent vinyl-triethoxysilane （KH-151）, γ-（2,3-epoxypropoxy）propy-trimethoxysilane （KH-560）, 3-methacryloxypropyl -trimethoxysilane （KH-570） （named as M-SBA-15）, respectively. Then SBA-15 and M-SBA-15 were served as “microreactor” to carry out the reverse atom transfer radical polymerization（RATRP）of methyl methacrylate（MMA）. The products were characterized by XRD, N2 adsorption/desorption, TG, DSC, GPC and FT-IR. The results demonstrate that the MMA is suuccessfully polymerized in the pores of SBA-15. The mesoporous structures of PMMA/SBA-15 composite materials are maintained, but the regularity decreases. The molecular weights, thermal stability and glass transition temperature（Tg） of the PMMA obtained in the pore are higher than those of the normal PMMA synthesized by RATRP, while the polydispersity indexs are broader. The modified mesoporous SBA-15 exhibits stronger adsorption ability and confined effect than prue SBA-15.

关 键 词：硅烷偶联剂 介孔材料 微反应器 反向原子转移自由基聚合 甲基丙烯酸甲酯 

分 类 号：TQ316.322[化学工程—高聚物工业]