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Tuned phase behavior of weakly interacting polystyrene-block-poly(n-pentyl methacrylate) by selective solvent SCIE SCOPUS

Title
Tuned phase behavior of weakly interacting polystyrene-block-poly(n-pentyl methacrylate) by selective solvent
Authors
Moon, HCLi, CHan, SHKwak, JKim, JK
Date Issued
2014-02-12
Publisher
Elsevier
Abstract
We investigated, via small angle X-ray scattering, depolarized light scattering, rheometry, and transmission electron microscopy, the phase behavior of the mixture of a symmetric polystyrene-block-poly(n-pentyl methacrylate) copolymer (PS-b-PnPMA) showing the closed-loop phase behavior and excellent baroplasticity, and dodecanol, a PnPMA-selective solvent. We found that the addition of a selective solvent is simple, but very effective to obtain various microdomains including hexagonally packed cylinders and gyroids. Also, with increasing temperature, the mixtures showed multiple ordered-to-ordered transitions (OOTs) in addition to upper ordered-to-disordered transition (UODT). The first observation of gyroid microdomains in PS-b-PnPMA is very important, although they have been widely reported in many block copolymers, for instance, PS-block-polyisoprene copolymer (PS-b-PI) and PS-block-poly(D,L-lactide) copolymer (PS-b-PLA). Since the gyroid microdomains of PS-b-PnPMA show excellent baroplasticity, external pressure instead of temperature could easily change the micro domains. (C) 2013 Elsevier Ltd. All rights reserved.
Keywords
Block copolymer; Gyroid microdomains; Phase behavior; COPOLYMER HOMOPOLYMER BLENDS; ORDER-DISORDER TRANSITION; TO-GYROID TRANSITION; BLOCK-COPOLYMER; INTERACTION PARAMETER; VARYING SELECTIVITY; DIBLOCK COPOLYMERS; NEUTRAL SOLVENT; MECHANISMS; MORPHOLOGY
URI
https://oasis.postech.ac.kr/handle/2014.oak/14192
DOI
10.1016/J.POLYMER.2013.12.052
ISSN
0032-3861
Article Type
Article
Citation
POLYMER, vol. 55, no. 3, page. 951 - 957, 2014-02-12
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김진곤KIM, JIN KON
Dept. of Chemical Enginrg
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