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Preparation of HMSPP with PP undergone unsaturated vinyl silane crosslinking modification
Pages: 10-12
Year: Issue:  2
Journal: China Synthetic Resin and Plastics

Keyword:  high melt strength polypropyleneunsaturated vinyl silanecrosslinkingdivinylbenzene;
Abstract: High melt strength polypropylene (HMSPP) was prepared from grafting and crosslinking modification of polypropylene (PP) with unsaturated vinyl silane. The orthogonal experiments show that benzoyl peroxide has the most significant effect on the melt strength of HMSPP based on crosslinking modification of PP with long chain unsaturated vinyl silane, and the melt strength of HMSPP obtained through optimum experiment is 19.9 cN. Divinylbenzene (DVB) as a crosslinking agent can effectively improve the melt strength of HMSPP, and the mass fraction of DVB should be less than 1.0%. Styrene inhibits HMSPP chain rupture obviously when its mass content is 1.0%. When HMSPP is prepared by PP modification, the tensile strain at break decreases slightly, the melt strength increases by 4.7 times, and the notched Izod impact strength increases by 0.82 times in comparison with those of PP.
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