Preparation of isotropic spinnable pitch and carbon fiber by the bromination–dehydrobromination of biotar and ethylene bottom oil mixture

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Abstract

An isotropic pitch which has a relatively high softening point and an excellent spinnability for general performance carbon fiber was successfully prepared through the low-temperature co-carbonization with ethylene bottom oil (EO). The special bromination and dehydrobromination reaction of the mixed biotar and EO was adapted at a relatively low temperature for minimizing the phase separation of the two raw materials. The optimized reaction conditions for bromination and dehydrobromination were the heat treatments at 110 °C for 1 h with 20 wt% of Br2 addition and at 320 °C for 3 h under N2 atmosphere, respectively. After removal of volatile matters by thin layer evaporation at 350 °C, the target spinnable isotropic pitch, which has a relatively softening point of 205 °C and excellent spinnability, was successfully obtained with high synthetic yield of 45 wt%. The carbon fiber fabricated using the obtained isotropic pitch precursor showed an enormous tensile strength of 1200 MPa by heat treatment alone at 800 °C for 5 min.

Original languageEnglish
Pages (from-to)1165-1171
Number of pages7
JournalJournal of Materials Science
Volume52
Issue number2
DOIs
Publication statusPublished - Jan 1 2017

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Carbon fibers
Ethylene
Oils
Heat treatment
Carbonization
Phase separation
Raw materials
Evaporation
Tensile strength
Temperature
carbon fiber
ethylene

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "Preparation of isotropic spinnable pitch and carbon fiber by the bromination–dehydrobromination of biotar and ethylene bottom oil mixture",
abstract = "An isotropic pitch which has a relatively high softening point and an excellent spinnability for general performance carbon fiber was successfully prepared through the low-temperature co-carbonization with ethylene bottom oil (EO). The special bromination and dehydrobromination reaction of the mixed biotar and EO was adapted at a relatively low temperature for minimizing the phase separation of the two raw materials. The optimized reaction conditions for bromination and dehydrobromination were the heat treatments at 110 °C for 1 h with 20 wt{\%} of Br2 addition and at 320 °C for 3 h under N2 atmosphere, respectively. After removal of volatile matters by thin layer evaporation at 350 °C, the target spinnable isotropic pitch, which has a relatively softening point of 205 °C and excellent spinnability, was successfully obtained with high synthetic yield of 45 wt{\%}. The carbon fiber fabricated using the obtained isotropic pitch precursor showed an enormous tensile strength of 1200 MPa by heat treatment alone at 800 °C for 5 min.",
author = "Jianxiao Yang and Koji Nakabayashi and Jin Miyawaki and Seong-Ho Yoon",
year = "2017",
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T1 - Preparation of isotropic spinnable pitch and carbon fiber by the bromination–dehydrobromination of biotar and ethylene bottom oil mixture

AU - Yang, Jianxiao

AU - Nakabayashi, Koji

AU - Miyawaki, Jin

AU - Yoon, Seong-Ho

PY - 2017/1/1

Y1 - 2017/1/1

N2 - An isotropic pitch which has a relatively high softening point and an excellent spinnability for general performance carbon fiber was successfully prepared through the low-temperature co-carbonization with ethylene bottom oil (EO). The special bromination and dehydrobromination reaction of the mixed biotar and EO was adapted at a relatively low temperature for minimizing the phase separation of the two raw materials. The optimized reaction conditions for bromination and dehydrobromination were the heat treatments at 110 °C for 1 h with 20 wt% of Br2 addition and at 320 °C for 3 h under N2 atmosphere, respectively. After removal of volatile matters by thin layer evaporation at 350 °C, the target spinnable isotropic pitch, which has a relatively softening point of 205 °C and excellent spinnability, was successfully obtained with high synthetic yield of 45 wt%. The carbon fiber fabricated using the obtained isotropic pitch precursor showed an enormous tensile strength of 1200 MPa by heat treatment alone at 800 °C for 5 min.

AB - An isotropic pitch which has a relatively high softening point and an excellent spinnability for general performance carbon fiber was successfully prepared through the low-temperature co-carbonization with ethylene bottom oil (EO). The special bromination and dehydrobromination reaction of the mixed biotar and EO was adapted at a relatively low temperature for minimizing the phase separation of the two raw materials. The optimized reaction conditions for bromination and dehydrobromination were the heat treatments at 110 °C for 1 h with 20 wt% of Br2 addition and at 320 °C for 3 h under N2 atmosphere, respectively. After removal of volatile matters by thin layer evaporation at 350 °C, the target spinnable isotropic pitch, which has a relatively softening point of 205 °C and excellent spinnability, was successfully obtained with high synthetic yield of 45 wt%. The carbon fiber fabricated using the obtained isotropic pitch precursor showed an enormous tensile strength of 1200 MPa by heat treatment alone at 800 °C for 5 min.

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