Drying and shrinkage of polymer gels

Brazilian Journal of Chemical Engineering

S. S. Waje²  M. W. Meshram²  V. Chaudhary¹  R. Pandey¹  P. A. Mahanawar¹  B. N. Thorat² 

[1] ,University of Mumbai University Institute of Chemical Technology Chemical Engineering DivisionMumbai,India

关键词: Polymer gel;    Drying characteristics;    Diffusion coefficient;    Modified gel thickness;    Contraction coefficient;   

DOI  :  10.1590/S0104-66322005000200007

来源: SciELO

【 摘 要 】

The polymer hydrogel was synthesized by photo-polymerization process (UV light, 60 ºC) in presence of Photo-initiator (IrgacureR) and Cross-linker (NN'-methylene bisacrylamide; MBAM). In the present work, the drying of polymer hydrogel was carried out to study the effect of temperature, gel-sheet thickness, monomer ratio of acryl acid to acrylamide (AA/AM), concentration of MBAM and quantity of monomers. A correlation has been developed for modified sheet thickness as a function of contraction coefficient and degree of drying. Effective diffusivity was estimated from Fickian-diffusive model considering modified sheet thickness and was found to be in the range of 1.1 ´ 10-10-5.93 ´ 10-10 m²/s. The activation energy obtained using Arrhenius type equation was found to be in the range of 2979-10737 kJ/kmol H2O. The drying behavior shows an initial shoot-up in drying rate followed by constant rate and two falling rate periods.

【 授权许可】

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