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首页> 外文期刊>Journal of Applied Polymer Science >Gelation and crosslinking characteristics of photopolymerized poly(ethylene glycol) hydrogels
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Gelation and crosslinking characteristics of photopolymerized poly(ethylene glycol) hydrogels

机译：光聚合聚乙二醇水凝胶的凝胶化和交联特性

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摘要

The gelation and crosslinking features of poly(ethylene glycol) (PEG) hydrogels were scrutinized through the UV polymerization processes of poly(ethylene glycol) methacrylate (PEGMA) and poly(ethylene glycol) dimethacrylate (PEGDMA) mixtures. The real-time evolutions of the elastic moduli of the prepolymerized mixtures with different crosslinking ratios of PEGMA and PEGDMA and the photoinitiator concentrations were measured during photopolymerization. The rheological properties were compared with other properties of the PEG hydrogels, including the relative changes in the CC amounts in the mixtures before and after UV irradiation, water swelling ratio, gel fraction, mesh size, and mechanical hardness. As the portion of PEGDMA as a crosslinker increased, the final elastic modulus and gel fraction increased, whereas the swelling ratio and scratch penetration depth at the hydrogel film surface decreased because of the formation of compact networks inside the hydrogels. These results indicate that there was a good correlation between the rheological analysis for predicting the crosslinking transition during photopolymerization and the macroscopic properties of the crosslinked hydrogels. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41939.
机译：通过聚甲基丙烯酸乙二醇酯（PEGMA）和聚甲基丙烯酸乙二醇酯（PEGDMA）混合物的紫外线聚合过程，对聚乙二醇（PEG）水凝胶的凝胶化和交联特性进行了详细研究。在光聚合过程中，测量了具有不同交联比PEGMA和PEGDMA的预聚合混合物的弹性模量和光引发剂浓度的实时变化。将流变性质与PEG水凝胶的其他性质进行了比较，包括UV照射前后混合物中CC量的相对变化，水溶胀率，凝胶分数，筛目大小和机械硬度。随着PEGDMA作为交联剂的比例增加，最终弹性模量和凝胶分数增加，而在水凝胶膜表面的溶胀率和划痕穿透深度降低，这是因为在水凝胶内部形成了紧密的网络。这些结果表明，用于预测光聚合过程中的交联转变的流变学分析与交联的水凝胶的宏观性质之间具有良好的相关性。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41939。

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