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On orientation memory in high density polyethylene – carbon nanofibers composites

机译：关于高密度聚乙烯－碳纳米纤维复合材料的取向记忆

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An orientation memory effect in high density polyethylene (HDPE) filled with vapor grown carbon nanofibers (VGCNF) is reported. Two-dimensional X-ray (2DXR) confirmed the reorientation of HDPE crystallites upon the uniaxial stretching of HDPE and HDPE filled by VGCNFs. This anisotropy of 2DXR spectra was decreased by heating all stretched samples (loaded or not loaded by VGCNFs) from room to the melting temperature of HDPE. Upon cooling these samples to room temperature, it was noticed that only the nanocomposite retained a weak partial (uniaxial) order, while HDPE showed a completely isotropic 2DXR spectrum. It was concluded that during the stretching of nanocomposites the crystallites and VGCNFs were aligned along the uniaxial stress. Upon heating, the crystalline phase was melted, while the orientation of the VGCNFs was not significantly disturbed. The recrystallization of the polymer started preferentially from the VGCNF – polymer interphase, resulting into an anisotropic crystalline structure.
机译：据报道在填充有气相生长的碳纳米纤维（VGCNF）的高密度聚乙烯（HDPE）中的取向记忆效应。二维X射线（2DXR）证实了HDPE和VGCNF填充的HDPE的单轴拉伸后HDPE晶粒的重新取向。通过将所有拉伸样品（加载或未加载VGCNF）从室温加热到HDPE的熔融温度，可以降低2DXR光谱的各向异性。将这些样品冷却至室温后，注意到只有纳米复合材料保留了较弱的部分（单轴）顺序，而HDPE显示出完全各向同性的2DXR光谱。结论是，在纳米复合材料的拉伸过程中，微晶和VGCNFs沿单轴应力排列。加热后，结晶相熔化，而VGCNF的取向没有受到明显干扰。聚合物的重结晶优先从VGCNF –聚合物界面开始，从而形成各向异性的晶体结构。

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