液状ポリブタジェン添加によるアタクチックポリプロピレンのペルオキシド架橋

概要

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The vulcanization of atactic polypropylene by dicumyl peroxide does not give a form-stable vulcanizate due to the degradation caused by beta-scission of polypropylene radical during vulcanization.The addition of liquid polybutadiene to the system leads to the formation of a form-stable vulcanizate. The difference in microstructure of polybutadiene affected remarkably the progress of vulcanization.The addition of 1, 2-polybutadiene gave rapid and high consumption of double bond, high crosslinking density and high crosslinking efficiency of more than 5. It is supposed that the peroxide vulcanization for 1, 2-polybutadiene-polypropylene blend proceeds by polybutadiene-polypropylene co-vulcanization propagated by radical transfer reaction to the double bond of 1, 2-polybutadiene.The addition of 1, 4-polybutadiene gave low consumption of double bond, low crosslinking density and low crosslinking efficiency of lower than unity. It is supposed that the peroxide vulcanization for 1, 4-polybutadiene-polypropylene blend proceeds by coupling of polymer radicals.
日本ゴム協会の論文