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Digitale Medien

Glass transition in ionic polymers: The acrylatesPresented, in part, at the Marcl Meeting of the American Physical Society, Dallas, Texas, 1970. (1971)

Eisenberg, A. ; Matsura, H. ; Yokoyama, T.

New York : Wiley-Blackwell

Journal of Polymer Science Part A-2: Polymer Physics 9 (1971), S. 2131-2135

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ISSN: 0449-2978

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: It is shown that the glass transition temperatures of the ionic acrylates are subject to the same correlation as found for the phosphates, silicates, and ionenes; the equation is Tg = 730 (q/a) - 67, where q is the cation charge and a the separation between centers of charge for the cation and anion.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1971.160091203

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Digitale Medien

Dehydration kinetics and glass transition of poly(acrylic acid) (1969)

Eisenberg, A. ; Yokoyama, T. ; Sambalido, Emma

New York : Wiley-Blackwell

Journal of Polymer Science Part A-1: Polymer Chemistry 7 (1969), S. 1717-1728

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ISSN: 0449-296X

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The kinetics of dehydration and decarboxylation as well as the glass transition temperature as a function of anhydride content were measured for poly(acry1ic acid). It was found that the glass transition of PAA is of the order of 103°C and increases with increasing anhydride content, reaching an extrapolated value of 140°C for the pure linear anhydride. Anhydride formation is a firstsrder reaction, as is also decarboxylation, the latter being much slower than the former. The rate constants are for dehydration, ka = 2.5 × 109 exp {-26000/RT}; for decarboxylation, kd = 2.9 × 108 exp {-27000/RT}. Anhydride formation occurs primarily by an intramolecular process.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1969.150070714

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