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首页> 外文学位 >Polyacrylonitrile/carbon nanotube composite fibers: Reinforcement efficiency and carbonization studies.
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Polyacrylonitrile/carbon nanotube composite fibers: Reinforcement efficiency and carbonization studies.

机译：聚丙烯腈/碳纳米管复合纤维：增强效率和碳化研究。

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摘要

Polyacrylonitrile (PAN)/carbon nanotube (CNT) composite fibers were made using various processing methods such as conventional solution spinning, gel spinning, and bi-component gel spinning. The detailed characterization exhibited that the smaller and longer CNT will reinforce polymer matrix mostly in tensile strength and modulus, respectively. Gel spinning combined with CNT also showed the promising potential of PAN/CNT composite fiber as precursor fiber of the next generation carbon fiber. High resolution transmission electron microscopy showed the highly ordered PAN crystal layer on the CNT, which attributed to the enhanced physical properties. The subsequent carbonization study revealed that carbonized PAN/CNT fibers have at least 50% higher tensile strength and modulus as compared to those of carbonized PAN fibers. Electrical conductivity of CNT containing carbon fiber was also 50% higher than that of carbonized PAN fiber. In order to have carbon fiber with high tensile strength, the smaller diameter precursor fiber is preferable. Bi-component gel spinning produced 1-2 mum precursor fiber, resulting in ∼1 mum carbon fiber. The tensile strength of the carbonized bi-component fiber (islands fibers) is as high as 6 GPa with tensile modulus of ∼500 GPa. Further processing optimization may lead to the next generation carbon fiber.
机译：使用各种加工方法，例如常规溶液纺丝，凝胶纺丝和双组分凝胶纺丝，制备聚丙烯腈（PAN）/碳纳米管（CNT）复合纤维。详细的表征表明，较小和较长的CNT分别主要在拉伸强度和模量上增强聚合物基质。凝胶纺丝与CNT结合还显示出PAN / CNT复合纤维作为下一代碳纤维前体纤维的潜力。高分辨率透射电子显微镜显示CNT上的PAN晶体层高度有序，这归因于增强的物理性能。随后的碳化研究表明，与碳化PAN纤维相比，碳化PAN / CNT纤维的拉伸强度和模量至少高出50％。含碳纤维的CNT的电导率也比碳化PAN纤维的电导率高50％。为了使碳纤维具有高拉伸强度，优选直径较小的前体纤维。双组分凝胶纺丝可生产1-2微米的前体纤维，从而产生约1微米的碳纤维。碳化双组分纤维（海岛纤维）的抗拉强度高达6 GPa，拉伸模量约为500 GPa。进一步的工艺优化可能会导致下一代碳纤维。

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