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

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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 β‐crystals of polypropylene (PP) is hardly reported. The main goal of this study was to find out the factors influencing the β‐crystal content in β‐nucleated PP/polyamide 6 (PA6) alloys and determine the best preparation conditions to obtain β‐nucleated PP/PA6 alloys rich in β‐crystals.

RESULTS: The compounding methods had little influence on the crystallization temperature of both PP and PA6. However, the melting characteristic and β‐crystal content in β‐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 β‐crystal content can be obtained by adding the nucleating agent at a temperature below 190 °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. Copyright © 2009 Society of Chemical Industry
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Keywords: melting characteristic; polyamide 6; polypropylene; β‐crystal

Document Type: Research Article

Publication date: December 1, 2009

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