Nucleating agent induced impact fracture behavior change in PP/POE blend |
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Authors: | Hongwei Bai Yong Wang Bo Song Ximei Fan Zuowan Zhou Yanli Li |
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Affiliation: | (1) Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, 610031 Chengdu, China |
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Abstract: | This work was focused on the impact fracture behavior of polypropylene/ethylene-octene copolymer (PP/POE) blends with and
without nucleating agent (NA). The crystallization morphologies of injection-molded-bar were analyzed by polarization optical
microscope and the impact-fractured surface morphologies were characterized carefully through scanning electronic microscope.
Our results show that the addition of 0.2 wt% α/or β-NA induces the great decrease of spherulites diameters companioned with
the dramatically enhancement of PP/POE blend toughness. Virgin PP shows the typical brittle-fractured characteristic during
the whole fracture process. PP/POE shows the less-ductile fracture feature with multiple-craze formation. The addition of
NA into PP/POE blend changes the fractured surface feature from predominantly multiple-craze to predominantly shear yielding
or shear yielding involving materials cavitations and second-crack re-initiation, respectively, indicating the change from
brittle-like fracture mode to ductile fracture mode. The transformation of β → α during the impact process for β-NA nucleated
samples has been observed; however, such transformation is suppressed by the presence of POE. |
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Keywords: | PP/POE blend Nucleating agent Impact fracture behavior |
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