Photo-thermal-pH triple stimuli-responsive polyampholytic hydrogels containing light-absorbing Au nanoparticles, anionic and cationic functional groups along main and side chains possess better salt sensitivity compared to purely anionic or cationic hydrogels under certain conditions, which are sensitive to changes in temperature, pH and light intensity. In this paper, a continuum theory for photo-thermal-pH triple stimuli-responsive polyampholytic hydrogels is developed, with the consideration of the coupling between large deformation, photothermal conversion and chemical reactions. The comparison between the predicted results of a stress-free swelling example with the corresponding experimental data in the literature indicates that the proposed model is applicable to free swelling of the photo-thermal-pH triple-responsive polyampholytic hydrogels. Based on the proposed model, the influence of temperature, pH and light intensity, as well as functional groups’ concentration on the swelling ratio of the hydrogels is then analyzed. In addition, the model is extended to study the inhomogeneous and anisotropic swelling of a core-shell structure, with an exterior photo-thermal-pH triple responsive polyampholytic hydrogel and an interior hard core.

与纯阴离子或阳离子水凝胶相比，含有吸光金纳米粒子、主链和侧链上的阴离子和阳离子官能团的光-热-pH三重刺激响应型多两性水凝胶在对温度变化敏感的条件下具有更好的盐敏感性, pH 值和光照强度。在本文中，考虑到大变形、光热转化和化学反应之间的耦合，开发了光-热-pH 三重刺激响应性多两性水凝胶的连续介质理论。无应力溶胀实例的预测结果与文献中相应的实验数据的比较表明，所提出的模型适用于光-热-pH 三响应聚两性水凝胶的自由溶胀。基于所提出的模型，然后分析了温度、pH 值和光强度以及官能团浓度对水凝胶溶胀率的影响。此外，该模型还扩展到研究核壳结构的不均匀和各向异性膨胀，具有外部光-热-pH 三重响应聚两性水凝胶和内部硬核。