The Influence of Entanglements of Net Chains on Phase Transition Temperature of Sensitive Hydrogels in Chemo-Mechanical Coupled Fields
The Influence of Entanglements of Net Chains on Phase Transition Temperature of Sensitive Hydrogels in Chemo-Mechanical Coupled Fields
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DOI：
10.32604/cmes.2020.09152
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Tao Li;Qingsheng Yang;Lian-hua Ma;Xiao-jun Zhang
中科院分区：
文献类型：
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作者：
Tao Li;Qingsheng Yang;Lian-hua Ma;Xiao-jun Zhang
由聚合物网络聚合而成的水凝胶的相变可以视为聚合物网络稳定性的转变。当外部环境发生变化时，聚合物网络的稳定性可能会发生变化。这种变化将导致敏感水凝胶稳定性的转变，从而发生水凝胶的相变。在这里，我们通过在 Flory-Huggins 理论中添加 Gent 混合模型和 Edwards-Vilgis 滑移连接模型，提出了一种新的自由密度能量函数，该函数考虑了聚合物网络的非高斯性、链缠结和连接点的功能性。基于新的自由能函数编写了计算相变温度的程序。以PNIPAM水凝胶为例，通过分析水凝胶网络的微观结构参数，研究了网络缠结对水凝胶相变温度的影响。分析结果表明相变温度和纠缠网络之间存在显着关系。
Phase transition of hydrogel, which is polymerized by polymer network, can be regarded as the transition of polymer network stability. The stability of the polymer network might be changed when the external environment changed. This change will lead to the transformation of sensitive hydrogels stability, thus phase transition of hydrogel take place. Here, we present a new free density energy function, which considers the non-gaussianity of the polymer network, chains entanglement and functionality of junctions through adding Gent hyplastic model and Edwards-Vilgis slip-link model to Flory-Huggins theory. A program to calculate the phase transition temperature was written based on new free energy function. Taking PNIPAM hydrogel as an example, the effects of network entanglement on the phase transition temperature of hydrogel were studied by analyzing the microstructure parameters of the hydrogel networks. Analytical results suggest a significant relationship between phase transition temperature and entanglement network.