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Composition effect on dewetting of ultrathin films of miscible polymer blend

✍ Scribed by Jichun You; Shanshan Hu; Yonggui Liao; Kaixu Song; Yongfeng Men; Tongfei Shi; Lijia An

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
833 KB
Volume
50
Category
Article
ISSN
0032-3861

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✦ Synopsis

Two kinds of dewetting and their transition induced by composition fluctuation due to different composition in blend [poly(methyl methacrylate) (PMMA) and poly(styrene-ran-acrylonitrile) (SAN)] films on SiO x substrate at 145 C have been studied by in-situ atomic force microscopy (AFM). The results showed that morphology and pathway of dewetting depended crucially on the composition. Possible reason is the variation in intensity of composition fluctuation resulted from the change of components in polymer blend. Based on the discussion of this fluctuation due to the composition gradient, parameter of U q0 /E, which describes the initial amplitude of the surface undulation and original thickness of film respectively, has been employed to distinguish the morphologies of spontaneous dewetting including bicontinuous structures and holes. Prior to the investigation of dewetting, it is confirmed that this blend is miscible at 145 C using grazing incidence ultra small-angle X-ray scattering (GIUSAX).

πŸ“œ SIMILAR VOLUMES

Dewetting and Phase Behaviors for Ultrat
Dewetting and Phase Behaviors for Ultrathin Films of Polymer Blend
✍ Yonggui Liao; Zhaohui Su; Zhaoyan Sun; Tongfei Shi; Lijia An πŸ“‚ Article πŸ“… 2006 πŸ› John Wiley and Sons 🌐 English βš– 192 KB

## 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

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The dissolution rates of thin polymer films were measured and compared. Mixtures of various ratios of poly(methyl methacrylate), PMMA, and poly( p-hydroxystyrene), PPHS, were dissolved in methyl isobutyl ketone, MIBK. The polymer solutions were then spun into thin films on silicon wafers and dried.