Effects of polyoxyethylene nonylphenol on dynamic mechanical properties and crystallization of polypropylene |
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| Authors: | Qing-Xin Zhang Jian-Bin Song Zhi-Shen Mo |
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| Affiliation: | a School of Aerospace, Mechanical and Mechatronic Engineering, J07, The University of Sydney, Sydney, NSW 2006, Australia
b State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China |
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| Abstract: | Polypropylene (PP) was blended with polyoxyethylene nonylphenol (PN) in a twin-screw extruder and injection moulded. The dynamic mechanical properties of PP/PN blends were characterized by dynamic mechanical analyser (DMA). The glass transition temperature (Tg) of PP showed a slight decrease with incorporation of PN. Differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD) and polarized optical microscopy (POM) were employed to investigate the effects of PN on crystallization of PP. In a study of nonisothermal crystallization of PP and PP/PN blends, crystallization parameter analysis showed the addition of PN reduced the peak temperature of crystallization. β-form crystals of PP coexisted with α-form crystals in PP/PN blends, and oriented on the surface layer of injection moulded bar as revealed by WAXD. The degree of orientation was determined using Hermans orientation function. The thermal stability of β-form crystals was evaluated using high temperature WAXD and POM. |
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| Keywords: | Polypropylene Polyoxyethylene nonylphenol Crystallization |
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