Dynamic and Equilibrium Swelling of Biodegradable Starch-Based Superabsorbent Polymers

R.O. Nasser; M. Vázquez da Silva; João M.P.Q. Delgado; Maria P. Gonçalves; C.T. Andrade

doi:10.4028/www.scientific.net/DDF.273-276.126

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Intrinsic Diffusivities and Modeling of the Diffusion Multiples
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Electro-Diffusion in Multicomponent Ion-Selective Membranes; Numerical Solution of the Coupled Nernst–Planck–Poisson Equations
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Experimental and Numerical Study on Vapor Condensation of Wet Flue Gas in Chimney
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Dynamic and Equilibrium Swelling of Biodegradable Starch-Based Superabsorbent Polymers
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Experimental Values of Diffusion Coefficients of Organic Compounds in Water
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Effect of Temperature and Volume Changes on Effective Diffusivities of Sucrose and NaCl during Osmotic Dehydration of Vegetable Tissue
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Numerical Study of Propane-Air Mixture Combustion in a Burner Element
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Concentration Dependent Diffusion in Building Materials – Application of Different Methods
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Dynamic and Equilibrium Swelling of Biodegradable Starch-Based Superabsorbent Polymers

Abstract:

A series of biodegradable superabsorbent polymers (SAP’s) based on starch grafted with acrylic acid (AA) and crosslinked with N,N’-methylenebisacrylamide (MBIS) were obtained. The parameters that define SAP’s properties, such as starch type, amount of initiator, acrylic acid and crosslinker concentrations, and degree of neutralization were varied. The dynamic swelling was interpreted in terms of both a simple power of time equation and a more detailed model based on a coupled diffusion–relaxation mechanism. The diffusivity coefficients calculated from diffusion–relaxation model were compared with the microimages obtained by optical microscopic.