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Surface characteristics of polymer/small molecule blends

✍ Scribed by France Champagne; J.-F. Li; H. P. Schreiber; G. Dipaola-Baranyi

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
681 KB
Volume
54
Category
Article
ISSN
0021-8995

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✦ Synopsis

Inverse gas chromatographic data have been obtained for polystyrene, polycarbonate, and two substituted amines used as additives in the polymers. Surface energies have been determined and evaluations made of acid/base interaction parameters and Flory-Huggins X values for the surface bounded interphase. It was shown that acid/base considerations are implicated in the miscibility of these polymer/additive systems. Surface energy analyses showed that surface and bulk compositions in blends differed whether or not the blend components were miscible. Composition differences were the result of thermodynamic drives to minimize surface free energy.

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Diffusion of small molecules in glassy p
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✍ M. PΓΆnitsch; P. Gotthardt; A. GrΓΌger; H. G. Brion; R. Kirchheim πŸ“‚ Article πŸ“… 1997 πŸ› John Wiley and Sons 🌐 English βš– 255 KB πŸ‘ 2 views

Small molecules in glassy polymers are considered to occupy sites with a distribution of free energies of dissolution. Then their diffusivity depends on concentration and temperature in the same way as it has been derived for hydrogen atoms in metallic glasses. For hydrogen it was shown that the tra