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題名:	Stability-instability transition by tuning the effective interface potential in polymeric bilayer films
作者:	林瑜琤 Lin, Yu-Cheng
貢獻者:	應物所
日期:	2005.03
上傳時間:	2014-05-06 11:31:19 (UTC+8)
摘要:	The wetting behavior of a liquid polymer on top of a supported glassy polymer film is investigated with real (optical microscopy, phase measuring interference microscopy, and scanning force microscopy) and reciprocal space analysis techniques (X-ray reflectivity and grazing incidence small-angle X-ray scattering). The thermodynamic stability of the top film is determined by the interface potential that results from an interplay between short-range and long-range van der Waals contributions. It comprises two competing minima which correspond to a film of vanishingly small, microscopic thickness and to a film with a larger, mesoscopical thickness of a few nanometers. At high temperatures, the liquid top-layer forms drops sitting on top of this mesoscopically thin film. The short-range contribution influences the equilibrium state, and the long-range part of the interface potential determines the kinetics of dewetting. By varying the thickness of the glassy, polymeric sublayer, the effective interface potential is tuned, and a dewetting of the top layer is observed. Additionally, we find the kinetics of hole growth to be compatible with a reduction of the PA sublayer viscosity compared to the bulk.
關聯:	Macromolecules, 38(8), 3406-3413
資料類型:	article
DOI 連結:	http://dx.doi.org/10.1021/ma047602d
DOI:	10.1021/ma047602d
顯示於類別:	[應用物理研究所 ] 期刊論文

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