Density Perturbations in Polymers Near a Solid Substrate: An X-ray Reflectivity Study

Autor:	Véronique Carlier, Vincent Stone, Cécile Bollinne, Alain M. Jonas
Rok vydání:	1999
Předmět:	chemistry.chemical_classification Electron density Materials science Polymers and Plastics Organic Chemistry Substrate (electronics) Polymer Inorganic Chemistry X-ray reflectivity Adsorption chemistry Chemical physics Polymer chemistry Materials Chemistry Thin film Glass transition Reflectometry
Zdroj:	Macromolecules. 32:4719-4724
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma990363n
Popis:	We have studied by X-ray reflectometry the variation of electron density of thin polymer films near solid substrates. For most polymers studied, which interact only mildly with the selected substrate (SiO2), a decrease of density was detected over a region spanning two to three statistical segment lengths at the solid interface. For poly(4-vinylpyridine) (P4VP), however, an increase of density was observed. This is related to the existence of strong adsorption interactions between P4VP and SiO2. These observations are in good agreement with theoretical predictions and may play a role in explaining the variation of the glass transition of thin supported polymer films as compared to bulk glass transitions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5755323536ae5bd63c67a15ec8a24f01 https://doi.org/10.1021/ma990363n Zobrazit plný text záznamu