Present status of the rubber elasticity theory

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Abstract
The development of the rubber elasticity theory is reviewed. Particular emphasis is given to the recent generalization of the elastic equation of state to the case where the chains display changes in internal energy with change in conformation and to the correlation between the elastic behavior of a crosslinked amorphous polymer and its dilute solution properties. Experimental results on the tension–temperature coefficient and on the stress–strain isotherm for polymer networks, which demonstrate the correctness of the generalized elastic equation of state, are surveyed.