Role of high-molecular-weight homopolymers on block copolymer self-assembly: From morphology modifier to template
Role of high-molecular-weight homopolymers on block copolymer self-assembly: From morphology modifier to template
复制标题
高分子量均聚物对嵌段共聚物自组装的作用：从形态改性剂到模板
DOI：
10.1002/macp.201800443
复制
发表时间：
2019
影响因子：
2.5
通讯作者：
Xiao Jin
中科院分区：
文献类型：
--
作者：
Shuo Zhang;Chunhua Cai;Zhanwen Xu;Jiaping Lin;Xiao Jin
For block copolymer (BCP)/homopolymer self‐assembly systems, the molecular weight of homopolymers is usually lower than that of BCPs. Herein, the cooperative self‐assembly of polystyrene‐b‐poly(ethylene glycol) (PS‐b‐PEG) BCPs with high‐molecular‐weight polystyrene (PS) homopolymers is reported. The molecular weight of PS homopolymers is 3–63 times that of the PS blocks. Typically, a spherical micelle–vesicle–large sphere morphology transition is observed by increasing the weight fraction of PS homopolymers in the polymer mixtures (fHP). Dynamic process studies reveal that with adding water to the solution of polymer mixtures in organic solvent, the homopolymers first collapse into globules, and their size increases withfHPand the molecular weight. Then these PS globules cooperatively self‐assemble with the PS‐b‐PEG BCPs. Depending on their size, these PS globules play different roles in the self‐assembly process. Small PS globules act as morphology modifiers inducing the micelle–vesicle transition, while large PS globules serve as self‐assembly templates for PS‐b‐PEG resulting in large spheres.
