Cooperative effect of molecular orientation and β-form on toughening injection-molded isotactic polypropylene with β-nucleating agent

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[1] Lv, Ruihua
[2] Li, Zhujun
[3] Na, Bing
[4] Zou, Shufen
[5] Pan, Huayan
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Na, B. (bingnash@163.com) | 1600年 / John Wiley and Sons Inc卷 / 125期
关键词：
The toughness of conventional injection-molded isotactic polypropylene bars has been investigated with respect to the notch location and β-nucleating agent. Superior toughness is achieved in the β-nucleated bars with notches near the gate; but is absent in the near-gate bars without β-nucleating agent or in the β-nucleated ones far from the gate. With detailed structural analysis across the sample thickness; it is indicated that in these tough bars; extensive flow close to the surface suppresses the formation of β-form to a large extent but favors the generation of oriented α-form; whereas toward inner region; an opposite tendency is presented with the decay of flow strength and the activation of β-nucleating agent. Allowing that this peculiar hierarchical structure is absent in other two kinds of bars; it is deduced that the cooperative effect of molecular orientation of α-form in the skin layer and rich β-form in the inner region is responsible for the significant toughness enhancement in the β-nucleated bars near the gate. © 2012 Wiley Periodicals; Inc;
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