Enthalpy of interaction in poly(vinyl alcohol)-ammonium heptamolybdate composition: Effect of complex formation and structural changes / Safronov AP,Zyryanova AN,Gabdrafikova YM,Ostroushko AA // POLYMER SCIENCE SERIES A. - 2003. - V. 45, l. 10. - P. 1052-1058.

ISSN/EISSN:

0965-545X / нет данных

Type:

Article

Abstract:

The interaction of poly(vinyl alcohol) (PVA) with ammonium heptamolybdate in films and aqueous solutions within a wide composition range at 298 K was studied by calorimetry. It was shown that the enthalpy of component mixing in films is negative, thus suggesting that the energy of interaction in the polymer-salt composition is strong and that structural changes take place. The enthalpies of dissolution and dilution for solutions of polymer-salt systems with different compositions were measured. It was demonstrated that when the content of ammonium heptamolybdate in the compositions is small, the supermolecular structure of a partially crystalline polymer with a glassy amorphous part characteristic of PVA is preserved. At high salt contents in the composition, recrystallization occurs with the subsequent relaxation of the entropy of amorphous glassy regions in the polymer. The study of complex formation between PVA and ammonium heptamolybdate in dilute aqueous solutions demonstrated that this process is accompanied by heat release and can be regarded as a sterically hindered adsorption of PVA units on polyanions.

Author keywords:

THERMODYNAMIC STABILITY; GLASSY-POLYMERS; POLYCARBONATE

DOI:

нет данных

Web of Science ID:

ISI:000186526700016

Соавторы в МНС:

Другие поля

Поле	Значение
Month	OCT
Publisher	INTERPERIODICA
Address	PO BOX 1831, BIRMINGHAM, AL 35201-1831 USA
Language	English
Keywords-Plus	THERMODYNAMIC STABILITY; GLASSY-POLYMERS; POLYCARBONATE
Research-Areas	Polymer Science
Web-of-Science-Categories	Polymer Science
Number-of-Cited-References	23
Usage-Count-Since-2013	1
Journal-ISO	Polym. Sci. Ser. A
Doc-Delivery-Number	742PM