Journal
POLYMERS
Volume 11, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/polym11111777
Keywords
polypropylene; beta nucleating agent; ultrasound; crystal behavior
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Funding
- State Key Laboratory of Bio-Fibers and Eco-Textiles (Qingdao University)
- Shandong Key RD Program [2016GSF117008]
- Special Foundation of Taishan Scholar Construction Program [39]
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In this paper, the crystalline modification of isotactic polypropylene (PP) with a rare earth beta nucleating agent (WBG) with different ultrasound conditions was investigated by scanning electron microscopy (SEM), wide-angle X-ray diffraction (XRD), and differential scanning calorimetry (DSC). The relationship between the ultrasound conditions and the crystalline structure, as well as the mechanism for the behavior, were revealed. SEM showed that the dispersion of the nucleating agent in the PP matrix was better at shorter ultrasound distances. In addition, the higher the water cooling temperature, the better the nucleating agent was dispersed in the PP matrix. The results of XRD and DSC showed that the crystallinity and the relative content of the beta-crystal were increased with nearer ultrasound distance, as well as increased in higher water cooling temperatures. In particular, under the same conditions, the crystallinity and the relative content of the beta-crystal after ultrasonic treatment were much higher than those without ultrasound.
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