聚(偏氯乙烯-丙烯酸甲酯)-b-聚丙烯酸嵌段共聚物的胶束化行为  

Micellization Behavior of Poly(vinylidene chloride-methyl acrylate)-b-Poly(acrylic acid) Block Copolymers

作　　者：别妙[1] 杨杰[1] 尹逊迪 包永忠[1] 

机构地区：[1]浙江大学化学工程联合国家重点实验室化学工程与生物工程学院,杭州310027

出　　处：《高分子学报》2016年第4期443-448,共6页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号21176209)资助项目

摘　　要：通过可逆加成-断裂链转移（RAFT）溶液聚合制备了不同组成的两亲性聚（偏氯乙烯-丙烯酸甲酯）-b-聚丙烯酸（PVDC-b-PAA）嵌段共聚物,采用动态光散射、表面张力仪和透射电镜等研究了PVDC-b-PAA共聚物在水溶液中的胶束化行为,结果表明采用N,N-二甲基甲酰胺溶解、水相渗析可实现PVDC-b-PAA共聚物的自组装,形成均一透明的胶束水溶液;随着亲水PAA嵌段含量的增加,PVDC-b-PAA共聚物的临界胶束浓度逐渐增大;PVDC-b-PAA共聚物自组装形成的胶束呈现典型的球状结构,胶束粒径在70.9~110.9 nm之间,粒径分布较窄;水相p H值影响PVDC-b-PAA共聚物胶束表面zeta电位及胶束的聚集行为,当水相p H值由3变为1,胶束表面由带负电荷变为带正电荷,胶束聚集程度和聚集体平均粒径显著增大,粒径分布变宽.Poly （ vinylidene chloride-methyl acrylate） -b-poly （ acrylic acid） （PVDC-b-PAA） block copolymers with different compositions were synthesized by reversible addition-fragmentation chain transfer （RAFT） polymerization,and their micellization behavior was investigated by dynamic light scattering, surface tension measurement and transmission electron microscope analysis. It was found that PVDC-b-PAA copolymers could be self-assembled to form transparent micelle aqueous solutions by dissolving of the copolymer in N, N- dimethylformamide and dialysis by water. The critical micelle concentrations of PVDC-b-PAA copolymers were ranged from 9.9 to 19.6 mg/L, and increased with increasing PAA content in the copolymer. The micelles were almost in spherical morphology with a size range of 70.9 ~ 110.9 nm and with narrow size distributions. The pH value of aqueous phase affected the zeta potential and aggregation of micelles. When pH value was decreased from 3 to 1 ,the zeta potential of micelles was changed from a negative value to a positive value,the aggregation degree and the average size of micelle aggregates were rapidly increased,and the size distribution became wider.

关 键 词：偏氯乙烯 丙烯酸 嵌段共聚物 胶束 粒径 聚集 

分 类 号：O631.1[理学—高分子化学]