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Carbon nanotube induced structural and physical property transitions of syndiotactic polypropylene

机译：碳纳米管诱导间规聚丙烯的结构和物理性质转变

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摘要

In this paper we have studied the effect of increasing carbon multi-walled nanotube (CNT) concentration in composites of syndiotactic polypropylene (sPP) having the same crystalline form but different morphologies. The attention was focused on the form 1 of sPP with different degrees of perfection (in terms of percentages of chains in helical conformation, crystal dimensions and crystallinity) obtained using two different quenching temperatures from the melt, i.e. 25 and 100 degrees C. We observed a decreasing effect of the crystallization temperature on increasing the nanotube content up to the samples with 10% of CNT, that show a very similar structural organization independent of the undercooling. Only the amorphous phase turns out more relaxed in the samples crystallized at the highest temperature. Either the thermal or the mechanical properties are improved on increasing the CNT content in both series of samples. The electrical conductivity increases in a similar manner in both series of samples and between 1 and 3 wt% it shows a sizable step of about eight orders of magnitude, a phenomenon that can be regarded as the onset of a percolating structure for which charge transport may take place.
机译：在本文中，我们研究了增加具有相同晶型但形态不同的间规聚丙烯（sPP）复合材料中碳多壁纳米管（CNT）浓度的影响。注意力集中在使用两种不同的淬火温度（即25和100摄氏度）获得的具有不同完美度（就螺旋构象的链百分比，晶体尺寸和结晶度而言）的sPP的形式1。结晶温度降低对增加碳纳米管含量直至最多含10％CNT的样品的影响，显示出非常相似的结构组织，而与过冷无关。在最高温度下结晶的样品中，只有非晶相变得更加松弛。通过增加两个系列样品中的CNT含量，可以改善热性能或机械性能。在两个系列的样品中，电导率都以类似的方式增加，并且在1-3 wt％之间，它显示出大约八个数量级的可观台阶，这种现象可以看作是渗流结构的开始，为此电荷传输可能发生。

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