Abstract

It is characteristic with the crystalline solid of linear high polymers that the regular crystalline regions and the irregular entangled regions are mixed to form the spherulitic particles. Founded on this picture, the rate of crystallization is estimated as a function of the crystallization temperature, in line with the usual treatment on the formation of a new phase. The melting temperature in the process of heating the crystallized specimen at uniform rate is determined, on the supposition that melting is observed at temperature where the rate of melting becomes comparable with the heating rate. The theoretical results are fairly in accord with the observations on natural raw rubber. Some discussions are included relevant with the appropriateness of the model.

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