Formation of biomimetic hierarchical nanostructure in homopolymers and block copolymer ternary blend particles  

作　　者：Shu Kikuchi Ryoka Shoji Shinji Kanehashi Guanghui Ma Kenji Ogino 

机构地区：[1]Graduate School of Bio-Applications and Systems Engineering,Tokyo University of Agriculture and Technology,2-24-16 Nakacho,Koganei-shi,Tokyo 184-8588,Japan [2]Institute of Global Innovation Research,Tokyo University of Agriculture and Technology,2-24-16 Nakacho,Koganei-shi,Tokyo 184-8588,Japan [3]State Key Laboratory of Biochemical Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100080,China

出　　处：《Particuology》2022年第5期98-109,共12页颗粒学报（英文版）

基　　金：supported by Institute of Global Innovation Research in Tokyo University of Agriculture and Technology(TUAT).

摘　　要：In order to mimic hierarchical nanostructures in nature,particles of polymer blends consisting of poly(4-butyltriphenylamine)(PBTPA),poly(methyl methacrylate)(PMMA)and PBTPA-block-PMMA were fabricated by a solvent evaporation method.Effects of the molecular weight and the chemical composition of PBTPA-b-PMMA,molecular weights of homopolymers,and the composition of the blend on the morphology were investigated.The polymer blend particle consisting of PBTPA and PMMA homopolymers exhibited thermodynamically favored core-shell structure,in which more hydrophilic PMMA-shell surrounded PBTPA-core.The addition of 10 wt%of PBTPA-b-PMMA caused the morphological transition from core-shell toJanus or inversed core-shell,in which PBTPA-shell surrounded PMMA-core,depending on the molecular weight of PBTPA segment in PBTPA-b-PMMA.When the molecular weight of PMMA segment was higher than that of PMMA homopolymer,watermelon-like particles in which small PBTPA domain less than 80 nm dispersed in the PMMA domain surrounded by PBTPA shell were observed.As the ratio of PBTPA-b-PMMA increased,the interface of the macrophase separation became obscure.At 50 wt%of the PBTPA-b-PMMA,only microphase separation was observed.The measurement of interfacial tension by pendant drop method demonstrated that PBTPA-b-PMMA lower the interfacial tension between PBTPA and the aqueous phase to the value similar to that of PMMA with the aqueous phase.

关 键 词：MICROSPHERE Hierarchical structure Polymer blend Block copolymer Solvent evaporation Phase separation 

分 类 号：TQ317[化学工程—高聚物工业]