PS-PMMA嵌段共聚物/PMMA在选择性溶剂中的自组装行为

The Self-assembly Behavior of PS-PMMA/PMMA in Selective Solvents

用动态光散射和透射电镜研究了嵌段共聚物聚苯乙烯 -聚甲基丙烯酸甲酯 ( PS-b-PMMA)和其对应的均聚物聚甲基丙烯酸甲酯 ( PMMA)在选择性溶剂四氢呋喃 /环己烷 ( THF/CYH)中的自组装行为 .选择性溶剂对 PS嵌段是良溶剂 ,对 PMMA嵌段和均聚物 PMMA是非良溶剂 ,实验结果表明 ,在适当的分子量及组成条件下 ,PS-PMMA/PMMA在选择性溶剂中形成了单分散的纳米胶束 ,均聚物 PMMA与 PMMA嵌段一同形成了胶束的核 ,通过控制均聚物 PMMA的量可以在较大的范围内调整胶束的尺寸 .

The self-assembly of PS-PMMA/PMMA in selective solvents was studied by dynamic laser light scattering(DLS) and transmission electron microscope(TEM). The selective solvent was the good solvent for PS block while it was a precipitant for PMMA block and homopolymer. The results showed that the PS-PMMA/PMMA with a proper molecular weight and composition could self-assemble into micelles with mono-dispersity distribution. The homopolymer(PMMA) could assemble into the core of the micelles by a special interaction with the block PMMA and accelerate the process of the micellization. The micelles with different sizes can be obtained conveniently by adjusting the content of the homopolymer.