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Membranes obtained by preirradiation grafting of acrylic acid onto poly(tetrafluoroethylene-perfluorovinyl ether) (1984)

Hegazy, El-Sayed A. ; Dessouki, Ahmed M. ; Rabie, A. M. ; [et al.]

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Chemistry Edition 22 (1984), S. 3673-3685

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ISSN: 0360-6376

Keywords: Physics ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Some properties of the membranes obtained by preirradiation grafting of acrylic acid onto poly(tetrafluoroethylene-perfluorovinyl ether) copolymer (PFA) films have been investigated. The dimensional change caused by grafting and swelling behavior, water uptake, electrical conductivity, and mechanical properties of the grafted films were found to increase as the grafting proceeds. The influence of the preparation conditions (such as preirradiation dose, monomer concentration, grafting temperature, and film thickness) on those properties was studied. These properties were found to be dependent mainly on the degree of grafting regardless of grafting conditions, except at higher monomer concentration (〉40 wt %). The electric conductivity and mechanical properties for the membranes obtained at higher AAc concentrations were lower than those obtained at lower ones. Analysis by x-ray microscopy of the grafted films revealed that the grafting begins at the part close to the film surface and proceeds into the central part with progressive diffusion of monomer to give finally homogeneous distribution of the electrolytes in the whole bulk of the polymer. The membranes show good electrochemical and mechanical properties which make them acceptable for practical use as cation-exchange membranes.

Additional Material: 12 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pol.1984.170221205

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Average molecular weights in heterogeneous polymerization of methyl methacrylate (1987)

Moustafa, A. B. ; Sayyah, S. M. ; Rabie, A. M. ; [et al.]

Weinheim : Wiley-Blackwell

Acta Polymerica 38 (1987), S. 167-169

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ISSN: 0323-7648

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Description / Table of Contents: Die mittleren relativen Molekülmassen von Poly(methlmethacrylaten), die durch mit Natriumbisulfit initiierte heterogene Polymerisation von Methylmethacrylat erhalten wurden, folgen den gleichen Gesetzmäßigkeiten wie bei der homogenen Polymerisation. Die in der Monomer- und Wasserphase sowie in der Grenzfläche gebildeten Polymere wurden hinsichtlich ihrer Polydispersität mittels Dünnschichtchromatographie untersucht.

Notes: The average molecular weights of poly(methyl methacrylate)s obtained in heterogeneous polymerization of methyl methacrylate using sodium bisulfite as initiator were found to obey the same laws applied in homogeneous polymerization. The poly(methyl methacrylate)s formed in the monomer and water phases and the polymer formed at the interphase were investigated by thin layer chromatography with respect of their polydispersities.

Additional Material: 1 Ill.