PMEG-b-PMMA的ATRP法合成及其在甲苯中的自组装

Synthesis of PMEG-b-PMMA by ATRP approach and its self-assembling behavior in toluene

以2-溴代丙酰溴(BPB)为引发剂,溴化亚铜/联二吡啶为催化体系,通过原子转移自由基聚合(ATRP)合成了端基含一个α-溴原子的聚乙二醇单甲醚(PMEG-Br),以此为大分子引发剂引发甲基丙烯酸甲酯(MMA)聚合,得到了分子量分布较窄的PMEG-b-PMMA嵌段共聚物.用傅里叶变换红外光谱(FT-IR)、核磁共振(1H NMR)、凝胶渗透色谱(GPC)等方法对聚合物进行了表征.采用直接溶解法配制了PMEG-b-PMMA在甲苯中的反胶束溶液,利用透射电镜(TEM)观察了两亲嵌段共聚物PMEG-b-PMMA在甲苯溶液中的自组装行为.结果表明,嵌段共聚物PMEG-b-PMMA在甲苯中自组装形成了以亲水段为核、疏水段为壳的反胶束结构,且随着共聚物浓度的增大,胶束的形态依次经历了从球状到柱状再到层状的转变.

Using 2-Bromopropionyl bromide(BPB) as the initiator,CuBr/2,2'-bipyridine(Bpy) as the catalyst and ligand,the poly(ethylene glycol) monomethyl ether with single-caped halogen(PMEG-Br) was synthesized by atom transfer radical polymerization(ATRP).Using PMEG-Br as the macroinitiator and CuBr/Bpy as the catalyst and ligand,the block copolymer PMEG-b-PMMA was then synthesized.The product was characterized by Fourier transform infrared spectroscopy(FT-IR),nuclear magnetic resonance spectroscopy(NMR) and gel perm...