4-(氯甲基)苯基三甲氧基硅烷引发的甲基丙烯酸甲酯的原子转移自由基聚合

Atom Transfer Radical Polymerization of Methyl Methacrylate Using Bifunctional Initiator,4-(Chloromethyl)Phenyltrimethoxysilane

以含双官能团的4-(氯甲基)苯基三甲氧基硅烷(CM TM S)为引发剂,CuC l/ligand为催化剂体系,二甲苯为溶剂,进行甲基丙烯酸甲酯(MMA)的原子转移自由基聚合(ATRP),重点研究了配体对聚合反应的影响。通过1H-NM R表征,证明PMMA是由CM TM S引发MMA聚合而得。聚合转化率和聚合物分子量及其分布测定结果表明,分别采用具有长链烷基的4,4'-二壬基-2,2'-联吡啶(dN bpy)和N,N,N',N',N″-五甲基二乙基三胺(PM DETA)为配体,所得聚合物的数均分子量与转化率之间的线性关系比较好,分子量分布较窄(M-w/M-n分别为1.27和1.30);而采用2,2'-联吡啶(bpy)为配体,所得聚合物数均分子量随转化率变化关系远远偏离理论分子量随转化率变化关系,且分子量分布相对较宽(M-w/M-n为1.41)。

Atom transfer radical polymerization （ATRP） of methyl methacrylate（MMA） catalyzed by CuC1/ligand in xylene using 4-（chloromethyl）phenyltrimethoxysilane （CMTMS） as initiator was studied. Different ligands were used to study how the ligand affects the polymerization. ^1H-NMR spectra indicates that polymethylmethacrylate（PMMA） was polymerized through ATRP using the initiator. GPC analysis results indicate that controllability of the polymerization is much more better using dNbpy or PMDETA than using bpy as the ligand.