LI Xinming, CUI Yingde, YIN Guoqiang, et al. Initial dehydration behavior of copolymer hydrogel for contact lens[J]. CIESC Journal, 2005, (4): 732-737.
LI Xinming, CUI Yingde, YIN Guoqiang, et al. Initial dehydration behavior of copolymer hydrogel for contact lens[J]. CIESC Journal, 2005, (4): 732-737.DOI:
Hydrogel for contact lens was synthesized by copolymerization of N-vinylpyrrolidone
hydroxyethylmethacrylate
methylmethacrylate or ethylmethacrylate
butylmethacrylate.A dehydration model for hydrogel membrane was established.Initial dehydration behavior of the copolymer hydrogel was studied by the gravimetric and thermal mass loss analysis.The results showed that initial dehydration rate of hydrogel membrane was in inverse proportion with square crosslinking density.N-vinylpyrrolidone in the copolymer increased the dehydration rate
while methylmethacrylate
ethylmethacrylate or butylmethacrylate decreased the dehydration rate.In the initial dehydration stage
the dehydration behavior could be described by means of the first order reaction.