Peleg and Weibull models for water absorption of copolymer gels crosslinked on polyethylene glycol dimethacrylates

Ismail O.

RESEARCH ON CHEMICAL INTERMEDIATES, vol.40, no.4, pp.1327-1335, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 40 Issue: 4
  • Publication Date: 2014
  • Doi Number: 10.1007/s11164-013-1041-3
  • Journal Name: RESEARCH ON CHEMICAL INTERMEDIATES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1327-1335
  • Keywords: Absorption, Copolymer gel, Modeling, Peleg, Weibull, POLYELECTROLYTE GELS, HYDRATION KINETICS, INVERSE SUSPENSION, SUPERABSORBENT, HYDROGELS, POLYMERS, ACRYLATE, BEHAVIOR
  • Yıldız Technical University Affiliated: Yes

Abstract

In this study, the super-absorbent copolymer gels were obtained from the aqueous solution of monomers dispersed in a continuous organic phase. The inverse suspension polymerization was accomplished with the use of aqueous solutions of partly neutralized acrylic acid with a predetermined crosslinker agent, polyethylene glycol dimethacrylates (PEGDMA)/monomer ratio in cyclohexan. The copolymer gels synthesized using PEGDMA crosslinker with three different molecular weights (PEGDMA(330), PEGDMA(550), and PEGDMA(750)) were characterized by A +/- nfrared spectroscopy and scanning electron microscopy. Water absorption capacities of the copolymer gels were determined. The water absorption capacity of 1 g copolymer gels in water was respectively obtained as 232, 255, and 316 g water/g polymer gel for PEGDMA(330), PEGDMA(550), and PEGDMA(750), respectively. The Peleg and Weibull models were used to describe the water absorption behavior of the copolymer gels. The highest values of R (2) and the lowest values of chi (2) and RMSE for copolymer gels were observed with the Weibull model.