A novel highly efficient beta-nucleating agent for polypropylene using nano-CaCO3 as a support

作者：Zhang, Zishou; Chen, Chunyan; Wang, Chunguang; Junping, Zhang; Mai, Kancheng^*

来源：Polymer International, 2010, 59(9): 1199-1204.

DOI：10.1002/pi.2847

• isotactic polypropylene
• nucleator
• crystallization
• melting characteristic
• beta-crystal

In order to increase the isotactic content of beta-nucleated polypropylene (beta-iPP) and decrease the cost of its production, the investigation and development of novel highly efficient beta-nucleators are important issues. Nano-CaCO3 was used as a support to prepare a supported beta-nucleator, nano-CaCO3-supported calcium pimelate. Fourier transform infrared spectral analysis shows that an in situ chemical reaction takes place between nano-CaCO3 and pimelic acid. Differential scanning calorimetry results indicate that the crystallization and melting temperatures of beta-phase in supported beta-nucleator-nucleated iPP are higher than those of calcium pimelate-nucleated iPP. The beta-nucleating ability of the supported beta-nucleator is little influenced by the cooling rate and crystallization temperature over a wide range. The decreased content of pimelic acid in the supported beta-nucleator slightly decreases the crystallization temperature of iPP but it has no influence on the content of beta-phase in nucleated iPP. A novel supported beta-nucleator has been successfully synthesized via pimelic acid supported on the surface of CaCO3. The crystallization temperature of iPP and melting temperature of beta-phase in iPP nucleated using the supported beta-nucleator are higher than those of iPP nucleated using calcium pimelate. The concept of a supported nucleator will provide a new way to increase the efficiency of polymer additives and to decrease the amounts of them that need to be used by using nanoparticles as supports.

• 出版日期2010-9
• 单位中山大学