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The swelling behavior and network parameters of guar gum/poly(acrylic acid) semi-interpenetrating polymer network hydrogels
Authors:Xiuyu Li  Wenhui Wu  Jianquan Wang  Yufeng Duan
Institution:

aThe Experiment Center, Hebei Normal University, Shijiazhuang 050016, People’s Republic of China

bSchool of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, People’s Republic of China

cSchool of Material Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, People’s Republic of China

Abstract:Guar gum/poly(acrylic acid) semi-interpenetrating polymer network (IPN) hydrogels have been prepared via free radical polymerization in the presence of a crosslinker of N,N′-methylene bisacrylamide (MBA). The kinetics of swelling and the water transport mechanism were studied as a function of the composition of the hydrogels and the pH of the swelling medium. Hydrogels showed enormous swelling in aqueous medium and displayed swelling characteristics, which were highly dependent on the chemical composition of the hydrogels and pH of the medium in which hydrogels were immersed (ionic strength I = 0.15 mol/L). The semi-INP hydrogels were characterized by evaluating various network parameters such as average molecular weight between crosslinks (Mc) crosslink density (ρ) and mesh size ξ.
Keywords:Swelling behavior  Guar gum  Poly(acrylic acid)  Semi-IPN hydrogel  Network parameters
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