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The Effect of Casting Solvent Quality on the Structure of Polymeric Langmuir–Blodgett Films

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The effect of casting solvent quality (good vs. Θ solvent) on the structure of Langmuir–Blodgett films of a flexible-chain polymer [poly(dimethylsiloxane)] was examined on the basis of differences in the shape of Langmuir–Blodgett isotherms for two solvents, two temperatures, four polymer molecular weights, and three compression rates. The magnitude of a new index that describes the shape characteristics of the isotherm beyond the point of monolayer formation is found to be capable of separating all 48 isotherms studied into two groups, exclusively on the basis of the quality of the casting solvent. Experimental observations are supplemented by qualitative polymer physics interpretations regarding the structure of the films upon casting and compression.
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Keywords: CHAIN DIMENSIONS; ISOTHERMS; LANGMUIR-BLODGETT FILMS; MULTILAYERS; POLYDIMETHYLSILOXANE; SOLVENT QUALITY

Document Type: Research Article

Affiliations: 1: Institute of Physical Chemistry, NCSR Demokritos, Agh. Paraskevi Attikis, 15310, Greece 2: Institute of Physical Chemistry, NCSR Demokritos, Agh. Paraskevi Attikis, 15310, Greece; Department of Chemical Engineering, NTUA, Zografou, Athens, 15780, Greece 3: Department of Chemical Engineering, NTUA, Zografou, Athens, 15780, Greece

Publication date: 2001-09-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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