Journal
POLYMER INTERNATIONAL
Volume 61, Issue 2, Pages 328-336Publisher
WILEY
DOI: 10.1002/pi.3194
Keywords
hydrogel; 2-hydroxyethyl methacrylate; phase separation; modulus; shear behaviour
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Funding
- Academy of Sciences of the Czech Republic [KAN 200520804]
- Ministry of Education, Youths and Sports of the Czech Republic [MSM 0021620835, SVV-2011-263 305]
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The swelling and rheological behaviour of hydrogels of morphology varying from non-porous to highly porous was investigated. The hydrogels were prepared by redox free radical copolymerization of 2-hydroxyethyl methacrylate with 0.1 to 5 mol% of di(ethylene glycol) dimethacrylate in the presence of water varying from 40 to 80 wt%. Various compositions led to clear, turbid or macroporous gels. The morphology of the gels was characterized using optical microscopy and cryoscan electron microscopy. The oscillatory shear and creep of swollen gels revealed that there was a pronounced difference between homogeneous or microheterogeneous and macroporous gels with communicating pores. The achievement of optimum conditions for the correct determination of shear modulus was also analysed. (C) 2011 Society of Chemical Industry
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