Temperature dependence of the elastic modulus of alginate gels
Moe, S.T.; Draget, K.I.; Skjak Braek, G.; Smidsrod, O.
Carbohydrate Polymers 19(4): 279-284
ISSN/ISBN: 0144-8617 DOI: 10.1016/0144-8617(92)90081-z
The temperature dependence of the elastic modulus for alginate gels was studied using two different gel systems: covalently corsslinked 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.