Large amplitude oscillatory shear studies on the strain-stiffening behavior of gelatin gels

被引:0
作者
Wei-xiang Sun
Li-zhen Huang
Yan-rui Yang
Xin-xing Liu
Zhen Tong
机构
[1] South China University of Technology,Research Institute of Materials Science and State Key Laboratory of Luminescent Materials and Devices
来源
Chinese Journal of Polymer Science | 2015年 / 33卷
关键词
Gelatin; Large amplitude oscillatory shear; Strain-stiffening;
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中图分类号
学科分类号
摘要
Linear and nonlinear viscoelasticity of gelatin solutions was investigated by rheology. The dynamic mechanical properties during the sol-gel transition of gelatin followed the time-cure superposition. The fractal dimension df of the critical gel was estimated as 1.76, which indicated a loose network. A high sol fraction ws = 0.61 was evaluated from the plateau modulus by semi-empirical models. Strain-stiffening behavior was observed under large amplitude oscillatory shear (LAOS) for the gelatin gel. The strain and frequency dependence of the minimum strain modulus GM, energy dissipation Ed, and nonlinear viscoelastic parameter NE was illustrated in Pipkin diagrams and explained by the strain induced helix formation reported previously by others. The BST model described the strain-stiffening behavior of gelatin gel quite well, whereas the Gent and worm-like chain network models overestimated the strain-stiffening at large strains.
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页码:70 / 83
页数:13
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