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Dewetting and Phase Behaviors for Ultrathin Films of Polymer Blend

✍ Scribed by Yonggui Liao; Zhaohui Su; Zhaoyan Sun; Tongfei Shi; Lijia An

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
192 KB
Volume
27
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Summary: Dynamics of dewetting and phase separation in ultrathin films (thickness is ca. one radius of gyration, β‰ˆ1 R~g~) of poly(methyl methacrylate) (PMMA) and poly(styrene‐ran‐acrylonitrile) (SAN) blends on Si substrate has been studied by in situ atomic force microscopy (AFM). In the miscible region, a β€œspinodal‐like” dewetting driven by a composition fluctuation recently predicted by Wensink and JΓ©rΓ΄me (Langmuir 2002, 18, 413) occurs. In the two‐phase region, the dewetting of the whole film is followed by phase separation in the droplets, coupling with the wetting of the substrate by the PMMA extracted by the strong attractive interaction between them.
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