Abstract
In order to study the effects of crosslink density on relaxation modulus of aged polymer materials, an analytic expression was obtained based on the deformation kinetics model of polymer and the assumption that the Helmholtz free energy of materials can be represented as a quadratic form of internal variables on isothermal condition. This expression shows that crosslink density has effects on equilibrium modulus, transient modulus and relaxation rate in different ways. In a special case, a crosslink density-time corresponded principle exists when the polymer is lightly cross-linked and the crosslink density has a common influence on equilibrium and transient parts of relaxation modulus.
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