Title

利用無規則共聚物表面改質調控嵌段共聚物薄膜之方向性

Translated Titles

Control over the Orientation of Block Copolymer Thin Films Using Cross-Linked Random Copolymers as Surface Modifiers

Authors

張硯翔

Key Words

嵌段式共聚物 ; 無規則共聚物 ; 表面改質 ; 薄膜 ; 垂直結構 ; block copolymer ; random copolymer ; surface modification ; thin films ; vertical structures

PublicationName

臺灣大學高分子科學與工程學研究所學位論文

Volume or Term/Year and Month of Publication

2013年

Academic Degree Category

碩士

Advisor

童世煌

Content Language

英文

English Abstract

In this study, we used random copolymers to modify the surface of substrates and the modified surfaces were used to control the microdomain orientation of block copolymer thin films. We synthesized a series of random copolymers PS-r-P4VP by nitroxide-mediated controlled radical polymerization and the random copolymers were coated on substrates to form stable cross-linked mats where PS-b-P4VP and PS-b-PMMA thin films were spun-cast. The interfacial interactions between the blocks and the mats can be tuned by adjusting the compositions of PS-r-P4VPs and the optimal conditions for inducing perpendicular microdomains were investigated. Previous studies have shown that PS-r-PMMA mats can efficiently induce the perpendicular microdomains of PS-b-PMMA thin films due to the balance of the interfacial interactions. Here, we found that on PS-r-P4VP mats, the perpendicular microdomains of PS-b-P4VP can be induced only for films with small thickness, ~ one natural period of the block copolymer. Instead, PS-r-P4VP mats can be used to effectively control the orientation of PS-b-PMMA thin films. We attribute these results to the much higher surface tension of P4VP compared to that of PMMA, which greatly prevents the exposure of P4VP to air so that parallel microdomains are preferred on the free surface of the films. We also studied the effects of molecular weight of PS-b-P4VP and PS-b-PMMA on the orientation control and found that high molecular weights are required to produce perpendicular microdomains using the methods of surface modification. This can be well explained by the theory of chain end effect and nematic effect.

Topic Category 工學院 > 高分子科學與工程學研究所
工程學 > 化學工業
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