The kinetics of diffusion of water from different activity vapors and liq. phase were investigated in glassy amorphous PEEK films at 60° and in glassy semicryst. PEEK sheets at different temps., resp. In the case of the amorphous PEEK films (250 mm thick), the data at low activity levels were interpreted via a purely Fickian mechanism. At higher activity levels, the material showed the presence of a relaxation process; in this case the data were interpreted using a model proposed by Berens and Hopfenberg. Equil. sorption isotherm is also reported. Liq. water sorption in semicryst. (30%) PEEK sheets (2 mm thick) followed the classical Fickian mechanism.
Water sorption kinetics in Poly(aryl-ether-ether-ketone / Mensitieri, Giuseppe; A., Apicella; J. M., Kenny; Nicolais, Luigi. - In: JOURNAL OF APPLIED POLYMER SCIENCE. - ISSN 0021-8995. - STAMPA. - 37:2(1989), pp. 381-392.
Water sorption kinetics in Poly(aryl-ether-ether-ketone
MENSITIERI, GIUSEPPE;NICOLAIS, LUIGI
1989
Abstract
The kinetics of diffusion of water from different activity vapors and liq. phase were investigated in glassy amorphous PEEK films at 60° and in glassy semicryst. PEEK sheets at different temps., resp. In the case of the amorphous PEEK films (250 mm thick), the data at low activity levels were interpreted via a purely Fickian mechanism. At higher activity levels, the material showed the presence of a relaxation process; in this case the data were interpreted using a model proposed by Berens and Hopfenberg. Equil. sorption isotherm is also reported. Liq. water sorption in semicryst. (30%) PEEK sheets (2 mm thick) followed the classical Fickian mechanism.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
