Effect of Talc on Crystallization and Properties of Polypropylene

摘要

Composites of PP and talc were prepared by melt-blending and effects of talc on crystallization and mechanical properties of PP were systematically studied in this paper. When talc was added with a small amount, the crystallization properties and structure were studied by DSC and polarizing microscope. Study found that talc can make good function of nucleating agent, and the crystallization onset temperature and the crystallization peak temperature were both improved, and the degree of crystallinity reached up to the maximum 53.0%. When talc was added with a large amount, mechanical properties such as notched charpy impact strength and tensile strength were improved. Talc can also improve thermal stability of the PP/talc composites which was performed by TGA, and the onset temperature of degradation was improved by 18.2°C when 25phr talc was added. The study found that talc could make good performance both as nucleating agent and inorganic fillers.