NRおよびSBRにアクリロニトリルをγ線グラフト重合したポリマーの加硫物物性

概要

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Dielectric properties, i.e., dielectric constant ε′, loss factor ε″ and loss tangent tan δ of the vulcanizates obtained from the same grafted and blended polymers as those used in our previous papers respectively were determined here. Since variations of these properties as function of frequency for the grafted polymers were similar to those of the backbone polymers, it was thought that the former maintained some specific properties of the latter. On the other hand, variations of these properties as function of frequency in the blended polymers depended mainly on the acrylonitrile contents. Determination of dielectric properties also indicated that grafted polymers produced by the procedure (i) had more prominent grafting effect than those by (ii), and that grafted polymers from SBR had more prominent effect than those from NR. These results coincided with those obtained by determination of mechanical properties of the same vulcanizates reported in our previous papers. Dispersion state of the vulcanizates of grafted and blended polymers was also examined under a phasecontrast microscope.
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