Elastic entropic compliance

Not here . Also of great interest in relation to shape-memory performance is the relaxed modulus Er. It determines the recovery stress available to overcome any resistance to shape recovery during heating. It is determined by entropic elasticity of the network and is therefore expected to be proportional to absolute temperature. To compare the various polymers, therefore, relaxed moduli were all reduced to a common temperature T = 92.3°C the mean of the reference temperatures. Thus values were obtained from relaxed compliances thus... 

In addition to timescale shifts with temperature, the magnitude of the compliance or modulus can change. The kinetic theory of rubber-like elasticity suggests that the entropically based contribution of the modulus to the viscoelastic response should increase in direct proportion to the absolute temperature. Correspondingly, the reciprocal of the steady-state recoverable compliance should be directly proportional to the absolute temperature. This is true at temperatures that are greater than 2Tg, but, between 1.2Tg and 2Tg, the steady-state recoverable compliance Js is essentially independent of temperature. At still lower temperatures a strong decrease of Js, is seen [51]. 

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