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Type: Artigo de periódico
Title: Formation of opaque films by biomimetic process
Author: DeSouza, EF
Galembeck, F
Abstract: The preparation of opaque white films with amorphous aluminium polyphosphate, crystalline calcium carbonate and poly(vinyl acetate) latex is described. Film optical properties were characterized by diffuse reflectance spectrophotometry; morphological film features were examined by SEM, TEM, STM and AFM. Domain organization and void formation were detected, with dimensions of the same order of magnitude as the wavelength of visible light and can thus account for the film optical properties. Calcium carbonate consumption was monitored by X-ray diffraction and is assigned to a chemical reaction with aluminium polyphosphate, in which a mixed Al-Ca carbonate-polyphosphate is formed. The process of film opacification is interpreted as a result of dispersion, chemical reaction and orientation of solid inorganic particles within the polymer network during the film drying process. A model is proposed for void formation, based on volume contraction of the swollen inorganic particles, at a stage when their rigid surfaces are bound to the polymeric matrix.
Country: Inglaterra
Editor: Chapman Hall Ltd
Citation: Journal Of Materials Science. Chapman Hall Ltd, v. 32, n. 8, n. 2207, n. 2213, 1997.
Rights: fechado
Identifier DOI: 10.1023/A:1018503728742
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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