用ATRP法构筑核壳型梯度极性的多羟基多臂星状超支化聚合物及聚合物刷——三层聚合物刷的合成与表征

设计并通过原子转移自由基聚合方法 (ATRP)合成了核壳型具有梯度极性的多羟基多臂星状聚合物刷 .端羟基超支化聚 (3 乙基 3 羟甲基氧杂环丁烷 )与 2 溴 异丁基酰溴反应制得大分子引发剂 (HP Br) ,以Cu(I)Br和N ,N ,N′ ,N′ ,N″ 五甲基二乙基三胺 (PMDETA)为催化体系 ,进行甲基丙烯酸甲酯 (MMA)的ATRP反应 ,得到以甲基丙烯酸甲酯为臂的多臂星状超支化聚合物 (HP g PMMA) .又以HP g PMMA为引发剂 ,进行甲基丙烯酸羟乙酯 (HEMA)的ATRP聚合 ,得到核壳型具有梯度极性的多羟基多臂星状超支化聚合物 (HP g PMMA b PHEMA) ,继续将其羟基官能团溴代化 (与 2 溴 异丁基酰溴反应 ) ,引发HEMA的ATRP溶液聚合 ,得到了多臂星状超支化聚合物刷 .产物的结构用1 H NMR、FTIR、GPC等进行了表征和测试 .

BUILDING CORE-SHELL STAR POLYMERS AND POLYMER BRUSHES WITH HYDROXYL GROUPS AND DIFFERENT POLARITY LAYERS --THREE-LAYER POLYMER BRUSHES

Based on the atom transfer radical polymerization (ATRP) and the large amount of functional groups of hyperbranched polymers,core-shell multi-arm star polymer brushes with gradient polarity distribution were designed and prepared. ATRP of MMA initiated from hyperbranched macroinitiator (HP-Br) in the presence of Cu(I)Br and N,N,N′,N′,N″-pentamethyldiethylenetriamine (PMDETA) resulted in multi-arm star polymers (HP-g-PMMA). Then ATRP of HEMA with HP-g-PMMA as polymeric initiator afforded another multi-arm star polymer with hydroxyl groups (HP-g-PMMA-b-PHEMA). Accordingly, further reaction of HP-g-PMMA-b-PHEMA with 2-bromo-isobutyrylbromide produced multi-arm star polymer initiator (TL-HPB-Br).Finally, ATRP of HEMA initiated from TL-HPB-Br gave multi-arm star polymer brusches with three-layer structures.The structure of the resultant novel objects was confirmed with ()~1H-NMR,FTIR and GPC.