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Crystallization behavior and morphology of transparent polypropylene
Author(s): 
Pages: 65-67
Year: Issue:  2
Journal: China Synthetic Resin and Plastics

Keyword:  trasparent polypropylenetransparent nucleating agentcrystallization behaviorcrystallization morphology;
Abstract: The crystallization behavior and morphology of transparent nucleating agents and transparent polypropylenes were studied by differential scanning calorimetry (DSC), polarized light microscopy (PLM) and X-ray diffraction (XRD). The results indicate that the melting temperature of sorbitol nucleating agents decreases by 10-50 ℃ at the second heating up with the melting enthalpy decreasing by 50%-90% in comparison with those at the first heating up. The crystallization temperature, melting temperature of neat polypropylene is about 110, 152 ℃, respectively and the crystal structure is α form with spherulite size of approximately 50 μm. After adding the transparent nucleating agent, the crystallization temperature, melting temperature of polypropylene increases about 10, 3 ℃, respectively and the crystal structure is still α form with grain size deceasing to about 1 μm.
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