Combined effects of stretching and nanofillers on the crystalline structure and mechanical properties of polypropylene and single-walled carbon nanotube composite fibers
Combined effects of stretching and nanofillers on the crystalline structure and mechanical properties of polypropylene and single-walled carbon nanotube composite fibers
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DOI：
10.1007/s10118-014-1397-x
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发表时间：
2014-01
影响因子：
4.3
通讯作者：
Yao Gao;Guiying Zong;H. Bai;Q. Fu
中科院分区：
文献类型：
--
作者：
Yao Gao;Guiying Zong;H. Bai;Q. Fu
系统地研究了拉伸和单壁碳纳米管(SWCNTs)对两种不同拉伸倍数的熔融纺丝PP纤维结晶结构和力学性能的影响。熔融纺丝过程中拉伸力的大小对复合纤维中单壁碳纳米管束的分散性、取向和界面结晶结构有显著影响。在高拉伸倍数下制备的复合纤维中成功地形成了以延伸的PP链和排列的SWCNT束为杂化Shish，以PP片层为烤串的纳米杂化烤肉串(NHSK)超结构，并根据形态观察和2D-SAXS图谱对其形成机理进行了探讨。在高拉伸倍数下，由于单壁碳纳米管束的取向和分散性增强以及NHSK的形成，拉伸强度和弹性模量有了较大的提高。
The combined effects of stretching and single-walled carbon nanotubes (SWCNTs) on crystalline structure and mechanical properties were systematically investigated in melt-spun polypropylene (PP) fibers prepared at two different draw ratios. The dispersion, alignment of the SWCNT bundles and interfacial crystalline structure in the composite fibers are significantly influenced by the stretching force during the melt spinning. The nanohybrid shish kebab (NHSK) superstructure where extended PP chains and aligned SWCNT bundle as hybrid shish and PP lamellae as kebab has been successfully obtained in the composite fibers prepared at the high draw ratio and the related formation mechanism is discussed based on the results of morphological observations and 2d-SAXS patterns. Large improvement in tensile strength and modulus has been realized at the high draw ratio due to the enhanced orientation and dispersion of SWCNT bundles as well as the formation of NHSK.