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Mathematical modeling for the prediction of the overall swelling profile from poly (AM-co-AA-co-HEA) hydrogels: effect of glycidyl methacrylate and ammonium per sulphate

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International Journal of Plastics Technology

Abstract

In the present investigation, a series of hydrogels based on poly (AM-co-AA-co-HEA) from the constant weight ratio (1/1/1) of acrylamide (AM), acrylic acid (AA), and hydroxy ethyl acrylate (HEA) monomers were synthesized by solution polymerization to optimize the reaction conditions. The reaction conditions were optimized by varying the reaction temperature, reaction time, crosslinker and initiator concentration, and amount of solvent. At optimized reaction conditions, two different sets of hydrogels were synthesized by varying the concentrations of cross-linker (glycidyl methacrylate, GMA) from 1 to 4 % and initiator (ammonium per sulphate, APS) from 1 to 4 %, to study the effects of crosslinker variation as well as initiator variation on swelling ratio by Flory’s equations. The three mathematical models (early time, late time and etters model) were fitted on experimental swelling data to investigate the entire swelling profile of all the hydrogels prepared with various amounts of GMA and APS content. Values of swelling transport exponents showed that the swelling mechanism was shifted from diffusion to relaxation controlled in case of increasing APS content, while only diffusion mechanism was followed for increasing GMA content. The proportionality constant (k) was calculated by two different models (1) power law and (2) Baker and Lonsdale to confirm the validity of early-time model fitting on experimental swelling data.

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Authors and Affiliations

  1. Department of Plastic Technology, H. B. Technological Institute, Kanpur, U. P., 208002, India

    Seema Awasthi & Reena Singhal

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  1. Seema Awasthi
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  2. Reena Singhal
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Correspondence to Reena Singhal.

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Awasthi, S., Singhal, R. Mathematical modeling for the prediction of the overall swelling profile from poly (AM-co-AA-co-HEA) hydrogels: effect of glycidyl methacrylate and ammonium per sulphate. Int J Plast Technol 19, 241–262 (2015). https://doi.org/10.1007/s12588-015-9124-1

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  • DOI: https://doi.org/10.1007/s12588-015-9124-1

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