The parameter of binary interaction in weakly crosslinked polyelectrolyte gels near the collapse threshold / Safronov A. P.,Kamalov I. A. // POLYMER SCIENCE SERIES A. - 2011. - V. 53, l. 3. - P. 195-203.

ISSN/EISSN:

0965-545X / 1555-6107

Type:

Article

Abstract:

The behavior of partially ionized weakly crosslinked gels based on polyacrylamide that undergo a discrete phase transition-collapse in water-acetone mixtures and the behavior of gels of polyacrylic and poly(methacrylic acids) for which gradual contraction is observed under the same conditions are studied experimentally. The concentration dependences of the enthalpy of swelling for the gels in the mixtures with volume concentrations of acetone of 0, 20, 30, and 40\% are measured via isothermal calorimetry and are used to calculate the parameter of interaction between a polymer network and a medium during the approach toward the threshold concentration of collapse. In sharply collapsing gels based on polyacrylamide at an acetone concentration up to 40\%, the enthalpy parameter of interaction does not exceed 0.2, a value that is significantly smaller than the critical value. In contrast, in the gels based on polyacids, for which gradual contraction is observed, the enthalpy parameter is as high as 0.6 at the same content of acetone. The experimental data testify that a reduction in the energetics of interaction between a weakly charged polymer network and a medium is not the decisive cause of the discrete phase transition-collapse.

Author keywords:

PHYSIOLOGICAL SALT-SOLUTIONS; POLYACRYLATE HYDROGELS; POLYMER NETWORKS; ENTHALPY

DOI:

10.1134/S0965545X11030059

Web of Science ID:

ISI:000288756500001

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	MAR
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1555-6107
Keywords-Plus	PHYSIOLOGICAL SALT-SOLUTIONS; POLYACRYLATE HYDROGELS; POLYMER NETWORKS; ENTHALPY
Research-Areas	Polymer Science
Web-of-Science-Categories	Polymer Science
Author-Email	ikamalov@pochta.ru
Funding-Acknowledgement	Development of the Scientific Potential of the Higher School {[}2.1.1/1535]; federal special-purpose program Scientific and Educational Specialists of Innovation Russia {[}NK-43P]
Funding-Text	This work was supported by the federal special-purpose program Development of the Scientific Potential of the Higher School (grant no. 2.1.1/1535) and the federal special-purpose program Scientific and Educational Specialists of Innovation Russia (project no. NK-43P).
Number-of-Cited-References	19
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	6
Journal-ISO	Polym. Sci. Ser. A
Doc-Delivery-Number	739XY