The Reaction of Isotactic Polypropylene with Maleic Anhydride and Ionic Crosslinking of the Obtained Products:III. Physical Properties of the Ionically Crosslinked Products

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The reaction product between isotactic polypropylene and maleic anhydride was crosslinked with zinc acetate, and physical properties of the ionically crosslinked product were studied.The results obtained were as follows: 1) The crosslinking effect was remarkably observed in the melt index of the polymer.This effect was strongly displayed by the reaction product in solvent than that in moltenstate. 2) The ionically crosslinked product showed elevated softening temperature and improvedthermal stability. 3) Crosslinking effects on dynamic viscoelasticity and tensile stress-strain propertieswere hardly observed.Some other interesting properties observed were as follows: i) Maleic anhydride introduced into isotactic polypropylene was effective in increasingthe oxidative stability of the reaction product. ii) When isotactic polypropylene was treated with benzoyl peroxide, the spherulites formedin the product were very small.
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