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Control of surface morphology in blockcopolymerhomopolymer thin films : 블록공중합체단일중합체 블렌드 박막의 표면패턴 형성연구

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Authors

박정연

Advisor
차국헌
Issue Date
2003
Publisher
서울대학교 대학원
Keywords
블록공중합체/단일중합체 혼합물Blockcopolymer/homopolymer blend박막Thin films미세상분리Islands and holes홀 인 홀Hole-in-holeOptical microscopyAtomic force microscopySmall angle x-ray scattering.
Description
Thesis (master`s)--서울대학교 대학원 :응용화학부,2003.
Abstract
The structure of the thin films of symmetric diblock copolymer is governed by
boundary conditions, such as commensurability and interfacial interactions. For
thin films having lamellar morphology, film thickness is quantized to nL0 (where
n is an integer and L0 is the bulk equilibrium lamellar period) in case of
symmetric wetting or (n+1/2)L0 in case of asymmetric wetting. If the initial film
thickness is not commensurate with this constraint, either holes or islands of
height L0 are formed.
In our work, unusual hierarchical structures of polystyrene-b-poly(methyl
methacrylate) (PS-b-PMMA) thin films were induced by residual solvent after
annealing above Tg. In order to investigate how to reduce lateral strains imposed
on the hole layer, PS-b-PMMA/PPO thin films were prepared. It is well known
that (poly(2,6-dimethyl 1,4-phenylene oxide)) (PPO) is very miscible with PS
block of PS-b-PMMA block copolymer (χPS-PPO<0), while it is immiscible with
PMMA block (χPMMA-PPO>0). By adding PPO to block copolymer, L0 in bulk is
increased after temporary decreasing and the hierarchical structures of the thin
films were effectively suppressed. Surface morphology was investigated using
optical microscopy (OM) and atomic force microscopy (AFM) and equilibrium
lamellar domain pacing in bulk sample was measured by small angle x-ray
scattering (SAXS).
Keywords: blockcopolymer/homopolymer blend, thin films, islands and holes,
hole-in-hole, optical microscopy, atomic force microscopy, small angle X-ray
scattering.
Language
English
URI
http://dcollection.snu.ac.kr:80/jsp/common/DcLoOrgPer.jsp?sItemId=000000057191

https://hdl.handle.net/10371/68543
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