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Journal of Bioactive and Compatible Polymers
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Control of the Swelling Rate of Superporous Hydrogels

Namjin Baek

Purdue University, Departments of Pharmaceutics and Biomedical Engineering, West Lafayette, IN 47907-1336

Kinam Park

Purdue University, Departments of Pharmaceutics and Biomedical Engineering, West Lafayette, IN 47907-1336; School of Pharmacy, Purdue University, West Lafayette, IN 47907-1336kpark{at}purdue.edu

Jae Hyung Park

You Han Bae

Kwangju Institute of Science and Technology, Department of Materials Science and Engineering, Kwangju, Korea

Superporous hydrogels (SPHs) have a fast swelling property because of the presence of interconnected pores. While the fast swelling property is an advantage, sometimes it is necessary to control the swelling rate. A method of coating the SPH surface with a polymer layer was studied to control the swelling kinetics of SPHs in aqueous solutions. Poly(ethylene glycol-b-tetramethylene oxide) (PEGTMO), an amphiphilic block copolymer, dissolved in ethanol was used. The coating was done by dipping and equilibrium soaking in PEGTMO solutions. The delay in swelling of PEGTMO-coated SPHs was dependent on the PEGTMO concentration used. Poly(acrylamide-co-acrylic acid)-SPHs coated with a PEGTMO film showed lower hydrophilicity as measured by contact angle. SEM analysis revealed that the number of surface pores of SPHs was decreased by coating with PEGTMO. It appears that the PEGTMO coating reduced the surface hydrophilicity as well as the porosity, leading to slower swelling in aqueous solution.

Journal of Bioactive and Compatible Polymers, Vol. 16, No. 1, 47-57 (2001)
DOI: 10.1106/JMMT-15E1-BJE8-FQJ0
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