Effect of 2-Hydroxy Ethyl Acrylate (HEA) Content on Swelling of Poly Acrylamide-co-Hydroxy Ethyl Acrylate-co-Acrylic Acid Hydrogels

By : Seema Awasthi, Reena Singhal

Page No: 271-292

Abstract
A series of multi-component poly (acrylamide-co-2-hydroxyethyl actylate-co-acrylic acid) [AM-co-HEA-co-AA] hydrogels were synthesized by varying the hydroxyl ethyl acrylate (HEA) content from 0% - 50% approximately. The hydrogels were characterized by SEM analysis, elemental analysis, residual acrylic acid analysis, network parameters and swelling kinetic parameters. The influence of non-ionic HEA content on the water diffusion rate in three stages (i.e. initial, middle and latter) of swelling process were studied along with the mathematical models fitted on preliminary swelling data. The model fitting exhibited that as HEA content increased in feed, water diffusion rate in the initial stage of swelling process was increased. But However, applicability range of the early-time model for the initial stage of water diffusion decreased. Interestingly, when HEA content exceeded above the 24.39%, the early-time model did not work.

Authors :
Seema Awasthi and Reena Singhal : Department of Plastic Technology H. B. Technological Institute, Kanpur, U. P. -208002, India.