未加硫ゴム〜低分子物質混合系の研究

概要

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Morphology of mixtures of unvulcanized natural rubber or styrene butadiene rubber and low molecular weight (Mw.200-1000) substances which are generally used for rubber and the interaction between them aremeasured. Applicability of the free volume theory to the glass transition region and the degree of the distribution of the free volume and relaxation time of the rubber-low molecular weight systems are discussed.<BR>It has been concluded that the free volume theory can be applied to the compatible systems of rubber andlow molecular weight substance and the distribution of the free volume is broadened by mixing them and the system becomes micro-heterogeneous on the order of molecular sizes.<BR>On the other hand, the free volume of rubber molecules is a little influenced by mixing low molecular weight substances in incompatible mixtures whose heterogeneity can be determined by phase contrast microscope. In all cases the distribution of the relaxation time of the rubber-low molecular weight systems estimated from dynamic mechanical measurement is broadened by mixing.
日本ゴム協会の論文