Abstract
The influence of the nucleating agent that supported on polyhedral oligomeric silsesquioxanes (supported NA) on the properties of iPP was investigated in detail. It was found that the supported NA have higher nucleating efficiency than the original NA powder in the iPP system. The flexural modulus of iPP increased by 11.6% with 0.04 wt.% original NA powder and increased by 20.5% when supported NA added. The sizes of supported NA were investigated by scanning electron microscope (SEM) coupled with energy dispersive spectrometer (EDS). The crystal structure and morphology of the iPP samples was studied using wide-angle X-ray diffraction (WAXD) and polarized optical microscope (POM), respectively. The nucleating efficiency of supported NA and the dry mix of NA and POSS was also analyzed. The non-isothermal crystallization behaviors were analyzed using Mo’s model. Besides, the sample with supported NA exhibited lower complex viscosity (η*) values, indicting supported NA can act as a lubricant in system. A possible crystallization mechanism of supported NA in the iPP was proposed.
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