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Swelling behaviors, tensile properties and thermodynamic interactions in APS/HEMA copolymeric hydrogels |
| LIN Zhihui1, WU Wenhui1, WANG Jianquan1, JIN Xin2 |
| 1.School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; 2.Beijing Yanshan Petrochemical Co., Ltd, China SINOPEC, Beijing 102500, China; |
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Abstract A series of hydrogels was synthesized from hydrophobic allyl phenyl sulfone (APS) and hydrophilic 2-hydroxyethyl methacrylate (HEMA) by bulk free radical copolymerization. The effects of APS content and temperature were studied on network parameters such as effective crosslink density (ve), molar mass between crosslinks (Mc) and polymer-water interaction parameter (χ) of hydrogels. The increase in APS content was shown to enhance hydrophobic bonding within hydrogel, leading to the decrease in equilibrium water content (EWC) and the increase in volume fraction of polymer in hydrogel (φ2), tensile strength and Young s modulus. At the same time, the increases in ve and χ and the decrease in Mc were also observed. When the temperature is increased from 273 to 343 K, the hydrogel A/H3 undergoes decreasing in EWC and increasing in φ2 and χ values. The thermodynamic analysis indicated that the swelling process is an exothermic process.
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Issue Date: 05 December 2007
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