Temperature Dependence of the Shear Modulus in Concentrated Polymer Gels: Molecular Mechanism
DOI:
https://doi.org/10.15407/ujpe70.1.42Keywords:
polymer gel, shear modulus, cartilage tissueAbstract
In addition to the conventional entropic mechanism of the temperature dependence of the shear modulus in polymer gels, another one has been found. It is implemented in concentrated rigidchain gels. Such gels were shown to consist of two phases: a network and fibers, with the former phase determining the magnitude of the gel shear modulus. If the temperature increases, the fibers are destroyed; some chains come off the fibers and increase the network phase fraction, thus increasing the shear modulus. Temperature dependences of the shear modulus for gelatin gels with gelatin concentrations c = 12%, 20%, 30%, and 40% were measured in a temperature interval of 34–42 ∘C. They are consistent with the proposed mechanism. We will also show that this mechanism of the temperature dependence of the shear modulus is responsible for the temperature effect on the regeneration of damaged cartilage tissue.
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