The β-nucleation of polypropylene random copolymer filled by nano-CaCO3 supported β-nucleating agent

• DOI: 10.1007/s10973-011-2092-6
• Publication Date: 2011-12-03T22:08:48Z
• Authors: Zishou Zhang; Chunguang Wang; Junping Zhang; Kancheng Mai
• Keywords: Polypropylene; Thermal Stability

In this article, β-nucleation of nano-CaCO3 (CC) supported β-nucleating agent (Sup-β-NA) for random polypropylene copolymer (PPC) crystallization was studied by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction. The results showed that Sup-β-NA not only increased the peak temperature of the crystallization of PPC but also induced PPC to form almost pure β-modification. It indicated that Sup-β-NA possessed effective β-nucleation. The content of Sup-β-NA had little influence on the crystallization behavior and melting characteristics together with the β-modification content of PPC, but those were affected by the mass ratio of CC/β-NA (calcium pimelate) in the Sup-β-NA. The final temperature of the melt between 300 and 180 °C did not affect the β-nucleation of Sup-β-NA, although the β-nucleation of Sup-β-NA would be decreased with the final temperature of the melt lower than 170 °C. In addition, DSC multiple heating and cooling scanning had little influence on the thermal stability of β-nucleation of Sup-β-NA.