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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 6-五月-2014 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 http://dx.doi.org/10.1021/ma047602d
dc.contributor 應物所en_US
dc.creator (作者) 林瑜琤zh_TW
dc.creator (作者) Lin, Yu-Chengen_US
dc.date (日期) 2005.03en_US
dc.date.accessioned 6-五月-2014 11:31:19 (UTC+8)-
dc.date.available 6-五月-2014 11:31:19 (UTC+8)-
dc.date.issued (上傳時間) 6-五月-2014 11:31:19 (UTC+8)-
dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/65818-
dc.description.abstract (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.en_US
dc.format.extent 128 bytes-
dc.format.mimetype text/html-
dc.language.iso en_US-
dc.relation (關聯) Macromolecules, 38(8), 3406-3413en_US
dc.title (題名) Stability-instability transition by tuning the effective interface potential in polymeric bilayer filmsen_US
dc.type (資料類型) articleen
dc.identifier.doi (DOI) 10.1021/ma047602den_US
dc.doi.uri (DOI) http://dx.doi.org/10.1021/ma047602d en_US