Phase Transitions of Block Copolymer Film on Homopolymer-Grafted Substrate
作者： Hyungju Ahn , Changhak Shin , Byeongdu Lee , Du Yeol Ryu
DOI: 10.1021/MA9022229
关键词: Lamella (surface anatomy) 、 Gyroid 、 Phase transition 、 Morphology (linguistics) 、 Crystallography 、 Materials science 、 Phase (matter) 、 Copolymer 、 Polymer chemistry 、 Thin film 、 Substrate (electronics)
摘要: Morphological transitions such as the order-to-order transition (OOT) and order-to-disorder (ODT) for an asymmetric polystyrene-block-polyisoprene (PS-b-PI) were investigated in bulk film. The PS-rich block copolymer (BCP) possessed lamella morphology (LAM), which transformed to gyroid (GYR) then disordering (DIS) with increasing temperature. Between LAM GYR, a perforated layered structure (PL) phase mixture (Fddd + GYR) of poorly ordered Fddd GYR observed. On other hand, film coated on PS-grafted substrate showed from random epitaxially oriented hexagonally modulated layer (HML) morphology. HML further observed was not at any stage BCP presented only different OOT pathway but also higher ODT temperatures. In addition, d-spacings layers parallel ...
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