Ordering and microdomain orientation in block copolymer films by thermal deprotection

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• 作者：Eunhye Kim^a ; Hyungju Ahn^a ; Hoyeon Lee^a ; Byeongdu Lee^b ; Du Yeol Ryu^a ; ^{dyryu@yonsei.ac.kr"" rel=""nofollow}
• 关键词：Ordering ; Microdomain orientation ; Block copolymer films
• 刊名：Polymer
• 出版年：2011
• 出版时间：26 May 2011
• 年：2011
• 卷：52
• 期：12
• 页码：2677-2684
• 全文大小：1834 K

文摘

Ordering and microdomain orientation for the films of symmetric polystyrene-b-poly(tert-butyl methacrylate)s (PS-b-PtBMAs) was investigated by in-situ grazing incidence small-angle X-ray scattering (GISAXS) and the electron microscopy. During thermal deprotection at higher temperature (200 °C), functional tert-butyl ester units in the PtBMA block component are integrated into inter- or intra-molecular anhydride linkages. It was observed that this process causes an increase in the Flory–Huggins interaction parameter (χ) between the two block components for disordered PS-b-PtBMA film, leading to a modulated nonequilibrium structure. Interestingly, for lamella-forming PS-b-PtBMA film, a significant chain stretching in lateral direction during thermal deprotection resulted in a characteristic strain-induced perpendicular orientation in the middle of the film confined between two parallel orientations of lamellar microdomains.