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Controlling the structure and properties of toughened and reinforced isotactic polypropylene

Abstract : As a commodity polymer, the applications of isotactic polypropylene (PP) are limited by its low impact strength. Based on the structure-property relationship, its impact strength could be improved by controlling its structure. In this study, different kinds of nucleating agents were used to promote the formation of beta crystals of PP as well as mixtures of two PPs of different molar masses. The mechanical properties, fracture behaviour, and crystalline morphology were investigated. The effects of the type and content of the peroxide and nucleating agent on the crystalline structure and mechanical properties of the PP were also explored. A multi-walled carbon nanotude (MWCNT) supported nucleating agent was introduced to modify the crystalline structure of PP and the impact strength of the resulting PP was 7 times that of the pure PP and more than 3 times that of beta nucleated PP. The large increase in the impact strength was attributed to the formation of beta transcrystalline morphology which was promoted by the MWCT supported nucleating agent
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  • HAL Id : tel-01749412, version 1



Shi-Wei Wang. Controlling the structure and properties of toughened and reinforced isotactic polypropylene. Food and Nutrition. Université de Lorraine, 2012. English. ⟨NNT : 2012LORR0231⟩. ⟨tel-01749412⟩



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