Preprint Article Version 1 This version is not peer-reviewed

A Comparison of Ethylene Tar-Derived Isotropic Pitches Prepared by Air Blowing and Nitrogen Distillation Method and Their Carbon Fibers

Version 1 : Received: 7 December 2018 / Approved: 10 December 2018 / Online: 10 December 2018 (11:54:14 CET)

A peer-reviewed article of this Preprint also exists.

Shi, K.; Yang, J.; Ye, C.; Liu, H.; Li, X. A Comparison of Ethylene-Tar-Derived Isotropic Pitches Prepared by Air Blowing and Nitrogen Distillation Methods and Their Carbon Fibers. Materials 2019, 12, 305. Shi, K.; Yang, J.; Ye, C.; Liu, H.; Li, X. A Comparison of Ethylene-Tar-Derived Isotropic Pitches Prepared by Air Blowing and Nitrogen Distillation Methods and Their Carbon Fibers. Materials 2019, 12, 305.

Journal reference: Materials 2019, 12, 305
DOI: 10.3390/ma12020305

Abstract

Two isotropic pitches were prepared by air blowing and nitrogen distillation method using ethylene tar (ET) as a raw material. And correspondent carbon fibers were obtained through conventional melt spinning, stabilization and carbonization. The structures and properties of resultant pitches and fibers were characterized and their differences were discussed in this work. The results showed that introduction of the oxygen by air blowing method could quickly increase the yield and softening point of pitch. Moreover, the air blown pitch (ABP) composed of linear methylene chains of aromatic molecules while the nitrogen distilled pitch (NDP) mainly contained polycondensed aromatic rings, which was due to the oxygen containing functional groups existed in ABP could impede order stack of pitch molecules and form methylene bridge structure, instead of aromatic condensed structure like NDP. Meanwhile, the spinnability of ABP was not decreased even containing 2.31 wt% oxygen. In contrast, ABP had narrower molecular weight distribution, which contributed to better stabilization properties and higher tensile strength of carbon fiber. The tensile strength of carbon fibers from ABP was reached to 860 MPa with fiber diameter of about 10 μm, which was higher than that of NDP-derived carbon fibers of 640 MPa.

Subject Areas

Carbon fiber; ethylene tar; isotropic pitch; air blowing

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