Toughening of Polypropylene Random Copolymer by β-Modification

In order to improve the impact strength of polypropylene random copolymer( PPR),the calcium pimelate nucleated PPR,nano-Ca CO3 and calcium pimelate-supported Ca CO3 filled PPR were prepared. Their mechanical properties,crystallization behavior and the content of β-modification were studied using mechanical testing,differential scanning calorimetry,wide-angle X-ray diffraction and scanning electron microscopy. The effect of calcium pimelate,nano-Ca CO3 and calcium pimelate-supported Ca CO3 on the impact strength,elongation at break,crystallization temperature and β-modification contents of PPR were investigated. The result indicated that using supported β-nucleating agent was an efficient method to increase the β-modification contents and improve the toughness of PPR.