Temperature-induced globule-to-coil transition in polymers has well been studied, and it is dependent strongly on temperature in their solutions due to significantly conformational changes of polymer molecules. In this study, a scaling framework is firstly developed to investigate stress-induced globule-to-coil transition in double-network (DN) hydrogels with an ultra-high stretchable strength. Free energy and globule radius functions are introduced to formulate the constitutive relationship of the DN hydrogels, in which stress-induced swelling and globule-to-coil transition are described for the hydrotropic and relatively hydrophobic networks, respectively. A cooperative free energy model based on the Flory-Huggins solution theory is then proposed for the DN hydrogels. The effectiveness of model is demonstrated by applying it to predict stress-induced globule-to-coil transitions in DN hydrogels and elastomers, where the theoretical results show good agreements with the experime...

中文翻译：

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具有超高拉伸强度的双网水凝胶中球状至线圈相变的定标动力学

温度引起的聚合物中球状到线圈的转变已经得到了很好的研究，由于聚合物分子的显着构象变化，它在很大程度上取决于溶液中的温度。在这项研究中，首先建立了一个缩放框架，以研究具有超高可拉伸强度的双网络（DN）水凝胶中应力诱导的球状-线圈过渡。引入自由能和小球半径函数来描述DN水凝胶的本构关系，其中分别描述了水溶性和相对疏水性网络的应力诱导的溶胀和小球到线圈的转变。然后提出了基于Flory-Huggins溶液理论的合作型自由能模型，用于DN水凝胶。