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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >Synthesis and Characterization of Hydrogels Based on Gamma Radiation Copolymerization of N-isopropylacrylamide and Ethylene Glycol Dimethacrylate Monomers
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Synthesis and Characterization of Hydrogels Based on Gamma Radiation Copolymerization of N-isopropylacrylamide and Ethylene Glycol Dimethacrylate Monomers

机译：基于N-异丙基丙烯酰胺和乙二醇二甲基丙烯酸酯单体的γ辐射共聚合的水凝胶的合成和表征

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摘要

Hydrogels based essentially on N-isopropylacrylamide (NIPAAm) and different ratios of ethylene glycol dimethacrylate (EGDMA) monomer were synthesized by gamma radiation copolymerization. The thermal decomposition behavior of NIPAAm/EGDMA hydrogels was determined by thermogravimetric analysis (TGA). The effect of temperature and pH on the swelling behavior was also studied. The results showed that the ratio of EGDMA in the comonomer feeding solution has a great effect on the yield product, gel fraction and water content in the final hydrogel. In this regard, it was observed that the increase of EGDMA ratio decreased these properties. The TGA study showed that all the compositions of NIPAAm/EGDMA hydrogels displayed higher thermal stability than the hydrogel based on pure PNIPAAm hydrogel. The swelling kinetics in water showed that pure PNIPAAm and NIPAAm/EGDMA hydrogels reached equilibrium after 6 h. However, NIPAAm/EGDMA hydrogels show swelling in water lower than pure PNIPAAm. The results showed that the swelling character of pure PNIPAAm and NIPAAm/EGDMA hydrogels was affected by the change in temperature within the temperature range 25-40°C, and showed a reversible change in swelling in the pH range 4-7 depending on composition.
机译：通过γ辐射共聚合成了基本基于N-异丙基丙烯酰胺（NIPAAm）和不同比例的乙二醇二甲基丙烯酸酯（EGDMA）单体的水凝胶。 NIPAAm / EGDMA水凝胶的热分解行为通过热重分析（TGA）确定。还研究了温度和pH对溶胀行为的影响。结果表明，共聚单体进料溶液中EGDMA的比例对最终产物的产率，凝胶分数和水含量有很大影响。在这方面，观察到EGDMA比的增加降低了这些性能。 TGA研究表明，NIPAAm / EGDMA水凝胶的所有成分均显示出比基于纯PNIPAAm水凝胶的水凝胶更高的热稳定性。水中的溶胀动力学表明，纯PNIPAAm和NIPAAm / EGDMA水凝胶在6 h后达到平衡。但是，NIPAAm / EGDMA水凝胶在水中的溶胀低于纯PNIPAAm。结果表明，纯PNIPAAm和NIPAAm / EGDMA水凝胶的溶胀特性受温度在25-40°C范围内的变化的影响，并且在pH范围为4-7的情况下，溶胀的变化取决于成分。

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