Formation of chemical networks of acrylamide and acrylic acid hydrogels initiated by ammonium persulfate / Safronov A. P.,Terziyan T. V. // POLYMER SCIENCE SERIES B. - 2015. - V. 57, l. 5. - P. 481-487.

ISSN/EISSN:

1560-0904 / 1555-6123

Type:

Article

Abstract:

The process of crosslinking in hydrogels of polyacrylamide, poly(acrylic acid), and their copolymers that is initiated by ammonium persulfate is studied. It is shown that, when the threshold concentration of ammonium persulfate, which amounts to 3 mmol/L for PAcA and 18 mol/L for poly(acrylic acid), is exceeded, the chemical network of the gel is formed. A mechanism is advanced to explain the formation of junctions in the chemical networks of polyacrylamide and poly(acrylic acid) gels. It is based on the reaction of chain transfer involving the hydrogen atom in the alpha position relative to the functional groups of a chain. With the use of the Flory-Rehner equation, the degrees of polymerization of network subchains are calculated. Effects of the temperature of synthesis, the concentration of ammonium persulfate, and the composition of the monomer mixture on the degrees of swelling of the resulting gels are examined. The degrees of swelling of polyacrylamide gels filled with nanodispersed zirconia powder are measured. It is found that in the presence of the filler, the formation of the chemical network initiated by ammonium persulfate may be one of the important factors affecting gelation.

Author keywords:

CLAY NANOCOMPOSITE HYDROGELS; NANOPOWDERS; MECHANISM; GELS

DOI:

10.1134/S1560090415050140

Web of Science ID:

ISI:000362670200012

Соавторы в МНС:

Другие поля

Поле	Значение
Month	SEP
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1555-6123
Keywords-Plus	CLAY NANOCOMPOSITE HYDROGELS; NANOPOWDERS; MECHANISM; GELS
Research-Areas	Polymer Science
Web-of-Science-Categories	Polymer Science
Author-Email	Alexander.Safronov@urfu.ru
Funding-Acknowledgement	Russian Scientific Foundation {[}14-19-00989]
Funding-Text	This work was supported by the Russian Scientific Foundation (project no. 14-19-00989).
Number-of-Cited-References	17
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	15
Journal-ISO	Polym. Sci. Ser. B
Doc-Delivery-Number	CT2XU