新型聚合物刷PVBC-co-PS-g-PBMA的制备及表征

Preparation and Characterization of a Novel Polymer Brush PVBC-co-PS-g-PBMA

以偶氮二异丁腈(AIBN)为引发剂,十二烷基三硫代碳酸酯(DDMAT)为小分子链转移剂,将对氯甲基苯乙烯(VBC)、苯乙烯(St)进行可逆加成断裂链转移自由基(RAFT)无规共聚,合成两种单体物质的量比分别为1∶3和3∶1的二元无规共聚物聚对氯甲基苯乙烯-co-聚苯乙烯(PVBC-co-PS)。随后以氯化亚铜(CuCl)/2,2′-联吡啶(bpy)(物质的量比=1∶2.5)为催化体系,采用ATRP法将甲基丙烯酸丁酯(BMA)接枝到PVBC-co-PS上,通过凝胶渗透色谱仪(GPC)、核磁共振波谱仪( 1 H NMR)、傅里叶红外光谱仪(FTIR)、差示扫描量热仪(DSC)对聚合物进行了表征。结果表明,采用RAFT与ATRP联用技术成功制备两种具有不同接枝率的刷型共聚物聚对氯甲基苯乙烯-co-聚苯乙烯-g-聚甲基丙烯酸丁酯(PVBC-co-PS-g-PBMA)。

Using azodiisobutyronitrile(AIBN)as initiator,dodecyl trirhiocarbonate(DDMAT)as small molecular chain transfer agent,p-chloromethyl styrene(VBC)and styrene(St)were used to form copolymer by the method of reversible addition-fragmentation chain transfer polymerization(RAFT).The molar ratios of the two monomers were 1∶3 and 3∶1,which were binary random copolymer p-chloromethyl styrene-co-polystyrene(PVBC-co-PS).Subsequently,coprous butyl acrylate(BMA)was grafted to PVBC-co-PS by atom transfer radical polymerization(ATRP)method using copper chloride(CuCl)/2,2′-bipyridyl(bpy)(mass ratio=1∶2.5)as the catalytic system.The polymer was characterized by gel permeation chromatography(GPC),nuclear magnetic resonance spectroscopy( 1 H NMR),fourier transform infrared spectroscopy(FTIR),and differential scanning calorimetry(DSC).The results show that two kinds of brush copolymers PVBC-co-PS-g-PBMA with different grafting rates are successfully prepared by RAFT and ATRP.