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湿纺过程中剪切力和拉伸力对聚丙烯腈/碳纳米管复合纤维结构形成的影响

The Impact of Shear and Elongational Forces on Structural Formation of Polyacrylonitrile/Carbon Nanotubes Composite Fibers during Wet Spinning Process.

作者信息

Mirbaha Hamideh, Nourpanah Parviz, Scardi Paolo, D'incau Mirco, Greco Gabriele, Valentini Luca, Bittolo Bon Silvia, Arbab Shahram, Pugno Nicola

机构信息

Department of Textile Engineering, Amirkabir University of Technology, 15875-4413 Tehran, Iran.

Laboratory of Bio-inspired & Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, 38123 Trento, Italy.

出版信息

Materials (Basel). 2019 Aug 30;12(17):2797. doi: 10.3390/ma12172797.

DOI:10.3390/ma12172797
PMID:31480253
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6747761/
Abstract

Wet spinning of polyacrylonitrile/carbon nanotubes (PAN/CNT) composite fibers was studied and the effect of spinning conditions on structure and properties of as-spun fibers influenced by the presence of CNTs investigated. Unlike PAN fibers, shear force had a larger effect on crystalline structure and physical and mechanical properties of PAN/CNT composite fibers compared to the elongational force inside a coagulation bath. Under shear force CNTs induced nucleation of new crystals, whereas under elongational force nucleation of new crystals were hindered but the already formed crystals grew bigger. To our knowledge, this key effect has not been reported elsewhere. At different shear rates, strength, Young's modulus and strain at break of PAN/CNT as-spun fibers were improved up to 20% compared to PAN fibers. Application of jet stretch had less influence on physical and mechanical properties of PAN/CNT fibers compared to PAN fibers. However, the improvement of interphase between polymer chains and CNTs as a result of chain orientation may have contributed to enhancement of Young's modulus of jet stretched composite fibers.

摘要

研究了聚丙烯腈/碳纳米管（PAN/CNT）复合纤维的湿法纺丝，并研究了纺丝条件对受碳纳米管存在影响的初生纤维结构和性能的作用。与PAN纤维不同，与凝固浴内的拉伸力相比，剪切力对PAN/CNT复合纤维的晶体结构以及物理和机械性能有更大影响。在剪切力作用下，碳纳米管诱导新晶体成核，而在拉伸力作用下，新晶体的成核受到阻碍，但已形成的晶体生长得更大。据我们所知，这一关键作用在其他地方尚未见报道。在不同剪切速率下，与PAN纤维相比，PAN/CNT初生纤维的强度、杨氏模量和断裂应变提高了20%。与PAN纤维相比，喷射拉伸对PAN/CNT纤维的物理和机械性能影响较小。然而，由于链取向导致的聚合物链与碳纳米管之间界面的改善可能有助于提高喷射拉伸复合纤维的杨氏模量。

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