Author： Qu Ning Fu Yi-Zheng An Feng Qu Jing-bo Wang Ke-xin Li Bing-hai
Publisher： Taylor & Francis Ltd
ISSN： 0360-2559
Source： Polymer-Plastics Technology and Engineering, Vol.45, Iss.5, 2006-01, pp. : 637-640
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Abstract
The influence of ß crystalline form nucleating agent (ß nucleator) on the mechanical properties of homo-polymerized polypropylene (PPH), random-copolymerized polypropylene (PPR), block-copolymerized polypropylene (PPB), and PPH/PPR/PPB blends was studied. Polarized optical microscopy (POM), differential scanning calorimetry (DSC), and wide angle X-ray diffraction (WAXD) were used to characterize the crystalline morphology and behavior. The results indicated that a crystalline form of polypropylene (PP) had transformed to ß crystalline form by adding 0.5% ß nucleator; in the meantime, the toughness of PP and its blends was enhanced. That is, 0.5% ß nucleator helped to improve the notched impact strength of PPH, PPR, and PPH/PPR/PPB blends by 130%, 40%, and 40%, respectively, without losing the tensile strength and flexural strength.
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