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Effects of silver nanoparticles on the dynamic crystallization and physical properties of syndiotactic polypropylene

机译：银纳米颗粒对间同立构聚丙烯动态结晶和物理性能的影响

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摘要

The effects of silver (Ag) nanoparticles on the physical properties of syndiotactic PP (sPP) were investigated concentrating on the isothermal melt crystallization behavior under shear. sPP with 5 wt % Ag nanoparticles presented higher crystallization temperature (T,) and heat of crystallization (Delta H-c) than pure sPP. At 90 degrees C, the Ag nanoparticles had little effect on the induction time of crystallization but a little increased the half-time t(1/2)) for the crystallization. At 100 degrees C, however, the induction time was decreased with increasing the Ag content and the t1/2 was decreased up to the Ag content of 0.5 wt %. DSC melting endotherms exhibited double melting peaks when crystal-lized at 90 degrees C under shear but a single melting peak when crystallized at 100 degrees C. The WAXD patterns exhibited that the presence of Ag nanoparticles did not produce any change in the crystal structure of sPP. The tensile strength of sPP is little changed up to the Ag content of 0.1 wt % but it was decreased with further addition. In addition, the introduction of less than 0.1 wt % Ag increased the elongation at break, but further addition decreased it abruptly. (c) 2008 Wiley Periodicals, Inc.
机译：研究了银（Ag）纳米粒子对间规聚丙烯（sPP）物理性能的影响，重点研究了剪切下的等温熔体结晶行为。具有5 wt％Ag纳米颗粒的sPP的结晶温度（T）和结晶热（Delta H-c）比纯sPP高。在90摄氏度下，Ag纳米颗粒对结晶的诱导时间影响很小，但对结晶的半衰期t（1/2）却几乎没有增加。然而，在100℃下，诱导时间随着Ag含量的增加而减少，并且t1 / 2降低至0.5wt％的Ag含量。 DSC熔融吸热峰在剪切力下于90摄氏度结晶时显示出两个熔融峰，而在100摄氏度结晶时显示一个熔融峰。WAXD图谱表明，存在的纳米银颗粒不会改变sPP的晶体结构。 sPP的拉伸强度直到Ag含量为0.1重量％时几乎没有变化，但是随着进一步添加而降低。另外，少于0.1重量％的Ag的引入增加了断裂伸长率，但是进一步的添加突然降低了断裂伸长率。 （c）2008 Wiley期刊公司

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