Time-temperature equivalence in a PVA dual cross-link self-healing hydrogel
Time-temperature equivalence in a PVA dual cross-link self-healing hydrogel
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DOI：
10.1122/1.5029466
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发表时间：
2018-07
影响因子：
3.3
通讯作者：
Mincong Liu;Jingyi Guo;C. Hui;C. Creton;T. Narita;A. Zehnder
中科院分区：
文献类型：
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作者：
Mincong Liu;Jingyi Guo;C. Hui;C. Creton;T. Narita;A. Zehnder
已知由永久化学键和瞬时物理键组成的水凝胶具有自愈特性、高韧性和高粘弹性。这些机械反应源于变形过程中物理键的断裂和重组能力。在实验中发现，键断裂和重组的速率与应力无关，而与温度有关。使用具有化学和物理交联的聚（乙烯醇）水凝胶，在13至50°C的温度范围内，使用大应变加载/卸载张力测试和扭转流变仪测量机械响应的温度依赖性。流变学数据表明，时间-温度叠加可以将数据压缩成一条主曲线。研究发现，在允许模型参数与温度相关的情况下，先前开发的本构模型可以很好地拟合张力和流变学数据。根据流变仪试验数据和拉力试验数据直接计算出的水平（时间）和垂直（振幅）位移因子相互吻合良好，表明本构模型在所探索的温度范围内很好地描述了材料的力学行为，并且材料密切遵循简单的时间-温度叠加。已知由永久化学键和瞬时物理键组成的水凝胶具有自愈特性、高韧性和高粘弹性。这些机械反应源于变形过程中物理键的断裂和重组能力。在实验中发现，键断裂和重组的速率与应力无关，而与温度有关。使用具有化学和物理交联的聚（乙烯醇）水凝胶，在13至50°C的温度范围内，使用大应变加载/卸载张力测试和扭转流变仪测量机械响应的温度依赖性。流变学数据表明，时间-温度叠加可以将数据压缩成一条主曲线。研究发现，在允许模型参数与温度相关的情况下，先前开发的本构模型可以很好地拟合张力和流变学数据。水平（时间）和垂直（振幅）位移因子直接从t…
Hydrogels consisting of permanent chemical bonds plus transient physical bonds are known to have self-healing properties, high toughness, and to be highly viscoelastic. These mechanical responses derive from the ability of the physical bonds to break and reform during deformation. The rate of bond breaking and reformation is found experimentally to be independent of stress but is expected to depend on temperature. Using a poly(vinyl alcohol) hydrogel with chemical and physical cross links, the temperature dependence of the mechanical response is measured using large strain load/unload tension tests and torsional rheometry for temperatures from 13 to 50 °C. The rheometry data show that time-temperature superposition can be used to condense the data to a master curve. It is found that allowing the model parameters to be temperature dependent, a previously developed constitutive model fits the tension and rheometry data well. Horizontal (time) and vertical (amplitude) shift factors calculated directly from the rheometer test data and from tension test data agree well with each other showing that the constitutive model describes the mechanical behavior well over the temperature range explored and that the material closely follows simple time-temperature superposition.Hydrogels consisting of permanent chemical bonds plus transient physical bonds are known to have self-healing properties, high toughness, and to be highly viscoelastic. These mechanical responses derive from the ability of the physical bonds to break and reform during deformation. The rate of bond breaking and reformation is found experimentally to be independent of stress but is expected to depend on temperature. Using a poly(vinyl alcohol) hydrogel with chemical and physical cross links, the temperature dependence of the mechanical response is measured using large strain load/unload tension tests and torsional rheometry for temperatures from 13 to 50 °C. The rheometry data show that time-temperature superposition can be used to condense the data to a master curve. It is found that allowing the model parameters to be temperature dependent, a previously developed constitutive model fits the tension and rheometry data well. Horizontal (time) and vertical (amplitude) shift factors calculated directly from t...