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URN etd-0905106-164218 Statistics This thesis had been viewed 2962 times. Download 1465 times. Author Yu-Chen Huang Author's Email Address No Public. Department Chemical Engineering Year 2005 Semester 2 Degree Master Type of Document Master's Thesis Language Chinese&English Page Count 80 Title STUDIES ON THE PREPARATION AND PROPERTIES OF THE SILVER COMPLEX HYDROGELS Keyword gel complex complex gel Abstract ABSTRACT
A series of antibacterial superabsorbents containing silver nanoparticles based on sodium acrylate (SA), 1-vinyl-2-pyrrolidinone-silver ion complex (VP-Ag＋) and N, N’- methylene-bis-acrylamide (NMBA) were prepared by inverse suspension polymerization. The silver nanoparticles in the gels were reduced to use ascorbic acid (vitamin C) as reductant through in situ reduction method. The influence of the concentration of (VP-Ag＋) complex in the superabsorbents on the water absorbency, swelling behavior, and antibacterial effect of Candida albicans was investigated. Results showed that the water absorbency for sodium acrylate and VP copolymeric gel (SV gel) in deionized water was 1,016 g H2O/g gel, but the water absorbency for SV-Ag series gel decreased when the silver nanoparticle was added. Results also showed that the antibacterial effect of the superabsorbents increased with an increase of the silver concentration (1~10 ppm).
Opitcal transmittance was monitored in real time during the free radical crosslinking polymerization of N-isopropylacrylamide (NIPAAm), 1-vinyl-2-pyrrolidone/ silver ion complex (VP-Ag+) and N, N’-methylene-bis-acrylamide (NMBA). The effect of the concentration of vinyl pyrrolidinone-silver complex and polymerization temperature on the optical transmittance and gelation time for the gel polymerization was investigated. Results showed that the gelation time decreased as the complex concentration or polymerization temperature increased during polymerization. The gelation activation energy in the gel polymerization decreased as the complex concentration or polymerization temperature increased. The swelling ratios of the present gels decreased with the increase of the silver ion concentration in the copolymeric gels. SEM morphologies of the copolymeric gels were examined in this article.
Advisor Committee Wen-Fu Lee - advisor
Files Date of Defense 2006-07-25 Date of Submission 2006-09-05