ポリイソプレンゴムとアタクチックポリプロピレンとの混合について

概要

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As a diene rubber having relatively small polarity, the polyisoprene rubber was selected, and various problems involved in its blending with atactic polypropylene were investigated. The ratio of blending (in weight) was set at 100/0, 95/5, 90/10, 85/15, 80/20 and 75/25 respectively, while the method of roll blending was adopted. On blended rubbers, the compatibility was examined by the phase separation in solution and phase contrast microscope, while on blended and conpounded rubbers and their vulcanizates such characteristic values as Mooney viscosity, mill shrinkage, extrudability, physical strength, swelling in toluene were measured. As a result, the following points were clarified. As the blend ratio of atactic polypropylene increased in the unvulcanized state, Mooney viscosity dropped, while the mill shrinkage, sheet touch and extrusion properties were improved. After being vulcanized, such physical characteristics as tensile strength, elongation and hardness were seen to suffer slight deterioration. Also, in proportion to the blend ratio the various properties were seen to change more or less rectilinearly, while the observations with phase contrast microscope indicated that the blending was carried out micro-heterogeneously.
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