Melting characteristic and beta-crystal content of beta-nucleated polypropylene/polyamide 6 alloys prepared using different compounding methods

作者：Yang, Zhugen; Chen, Chunyan; Liang, Dianwei; Zhang, Zishou; Mai, Kancheng^*

来源：Polymer International, 2009, 58(12): 1366-1372.

DOI：10.1002/pi.2671

• polypropylene
• polyamide 6
• melting characteristic
• beta-crystal

BACKGROUND: The distribution of nucleating agents in different phases is still an open question in general, and how to control conditions to prepare alloys rich in beta-crystals of polypropylene (PP) is hardly reported. The main goal of this study was to find out the factors influencing the beta-crystal content in beta-nucleated PP/polyamide 6 (PA6) alloys and determine the best preparation conditions to obtain beta-nucleated PP/PA6 alloys rich in beta-crystals.
RESULTS: The compounding methods had little influence on the crystallization temperature of both PP and PA6. However, the melting characteristic and beta-crystal content in beta-nucleated PP/PA6 alloys not only depended upon the compounding methods, but also on the temperature at which the nucleating agent was added. A higher beta-crystal content can be obtained by adding the nucleating agent at a temperature below 190 degrees C, which is also dependent on the mixing time.
CONCLUSION: It is proved by etching the alloys with sulfuric acid that the nucleating agent mainly disperses in the PA6 phase and/or the interface between PP and PA6 when blended at high temperature.

• 出版日期2009-12
• 单位中山大学