Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Fabrication and Characterization of Modified Poly(2-hydroxyethyl methacrylate)(PHEMA) Hydrogels by Thermal/Photo Polymerization

  • Lee, Minsu (School of Polymer Science and Engineering, Chonnam National University) ;
  • Lee, Junghyun (School of Polymer Science and Engineering, Chonnam National University) ;
  • Jang, Jihye (School of Polymer Science and Engineering, Chonnam National University) ;
  • Nah, Changwoon (Department of Polymer-Nano Science and Technology, Jeonbuk National University) ;
  • Huh, Yang-il (School of Polymer Science and Engineering, Chonnam National University)
  • Received : 2019.12.03
  • Accepted : 2019.12.11
  • Published : 2019.12.31
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Abstract

Poly(2-hydroxyethyl methacrylate) (PHEMA) hydrogels modified with various co-monomers, such as N-vinyl pyrrolidone (NVP), glycidyl methacrylate (GMA), and glycerol monomethacrylate (GMMA), were prepared to investigate the effect of adding a co-monomer on the water contents, surface wettability, and tensile modulus. These polymers were synthesized by thermal- and photo-polymerization in the presence of azobisisobutyronitrile (AIBN) and diphenyl(2,4,6-trimethylbenzoyl)-phosphineoxide (TPO) as the initiators. The characteristics of the hydrogels were analyzed via FTIR and UV/Vis spectroscopies, contact angle measurements, and tensile modulus measurements with UTM. Regarding the properties of water in the hydrogels, the ratio between free to bound water was investigated using differential scanning calorimetry (DSC). The effects of adding the co-monomers on the water content, surface wettability, and tensile modulus for soft contact lenses were also investigated. In the case of p(HEMA-co-NVP) hydrogels, the increase in the equilibrium water content (EWC) was primarily due to the increase in the bound water content. For p(HEMA-co-GMMA) hydrogels, an increase in free water content was the main reason for the increased EWC. In contrast, in the case of p(HEMA-co-GMA) hydrogels, a decrease in bound water content was observed to be the main factor that reduced the EWC. Photo-polymerized PHEMA hydrogels showed enhanced surface wettability and tensile modulus as compared to those produced via thermal polymerization.

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