45 Swelling of superabsorbent acrylamide/sodium acrylate hydrogels prepared using multifunctional crosslinkers

Author(s): Karadag, E; Saraydin, D

Title: Swelling of superabsorbent acrylamide/sodium acrylate hydrogels prepared using multifunctional crosslinkers

Source: TURKISH JOURNAL OF CHEMISTRY, 26 (6): 863-875 2002

Language: English

Document Type: Article

Author Keywords: swelling; superwaterabsorbent; hydrogel; diffusion; crosslinking

Keywords Plus: ACID HYDROGELS; SYNTHETIC HYDROGELS; BEHAVIOR; COPOLYMERS; METHACRYLATE; NETWORKS; RELEASE

Abstract: Superwaterabsorbent acrylamide-sodium acrylate hydrogels were prepared by free radical polymerization in aqueous solutions of acrylamide and of acrylamide with sodium acrylate as comonomer. For each copolymerization, nine different compositions were used and in all systems a concentration of a multifunctional crosslinker such as trimethylolpropane triacrylate, ethylene glycol dimethacrylate, 1,4-butanediol dimethacrylate and N,N'-methylenebisacrylamide was employed. As a result of dynamic swelling tests, the influence of crosslinkers and the relative content of sodium acrylate on the swelling properties, the initial swelling rate and the swelling rate constant, swelling exponent, swelling coefficients and diffusional behaviour of water in the hydrogel systems were examined.. Acrylamide-sodium acrylate hydrogels were swollen in the range 860-12870% in water, while acrylamide hydrogels swelled in the range 770-1420%. The equilibrium water content of acrylamide-sodium acrylate hydrogel systems was calculated in the range 0.8851-0.9922. The water intake of hydrogels followed a non-Fickian type diffusion.

Addresses: Adnan Menderes Univ, Dept Chem, TR-09010 Aydin, Turkey; Cumhuriyet Univ, Dept Chem, TR-58140 Sivas, Turkey

Reprint Address: Karadag, E, Adnan Menderes Univ, Dept Chem, TR-09010 Aydin, Turkey.

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Cited Reference Count: 26

Times Cited: 4

Publisher: SCIENTIFIC TECHNICAL RESEARCH COUNCIL TURKEY

Publisher Address: PO BOX 605 YENISEHIR, 06445 ANKARA, TURKEY

ISSN: 1010-7614

29-char Source Abbrev.: TURK J CHEM

ISO Source Abbrev.: Turk. J. Chem.

Source Item Page Count: 13

Subject Category: CHEMISTRY, MULTIDISCIPLINARY; ENGINEERING, CHEMICAL

ISI Document Delivery No.: 618TE