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Temperature dependence of the elastic modulus of alginate gels |
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| Authors: | St rker T Moe Kurt I Draget Gudmund Skj k-Br k and Olav Simdsr d |
| Institution: | Norwegian Biopolymer Laboratory (NOBIPOL), Laboratory of Biotechnology, Norwegian Institute of Technology, University of Trondheim, Sem Sœlands vei 6-8, N-7034, Trondheim, Norway |
| Abstract: | The temperature dependence of the elastic modulus for alginate gels was studied using two different gel systems: covalently crosslinked Na-alginate gels and in-situ prepared Ca-alginate gels. The modulus of physically crosslinked gels showed a complex behaviour. The temperature coefficient of the modulus of covalently crosslink gels changed from positive for the lowest crosslinked gels to negative for the highest crosslinked gels. This suggests a change from rubberlike to enthalpy-driven elasticity with an increasing degree of crosslinking for these gel networks. |
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