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Chemical Modification of Asphaltene with SEBS as Precursor for Isotropic Pitch‐Based Carbon Fiber
Author(s) -
Ni Guosong,
Jiang Wei,
Shen Wenzhong
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201803764
Subject(s) - materials science , styrene , softening point , composite material , carbonization , fiber , ultimate tensile strength , ethylene , viscosity , carbon fibers , chemical engineering , polymer chemistry , polymer , organic chemistry , copolymer , chemistry , catalysis , scanning electron microscope , engineering , composite number
A high yield spinnable pitch for isotropic pitch‐based carbon fiber was successfully prepared by air oxidation polycondensation of asphaltene with styrene‐ethylene‐butylene‐styrene. The effects of reaction temperature and time, added styrene‐ethylene‐butylene‐styrene amount on the composition and spinning properties of resultant pitches were investigated. The resultant pitch with a concentrated molecular weight distribution of 300–700 Da was prepared at 340 ° C for 3 h under air blowing with 5% styrene‐ethylene‐butylene‐styrene, moreover, its more alkyl structure (mainly methylene), lower apparent viscosity above the softening point, and good spinnability endowed the resultant pitches more prone to oxygen cross‐linking during the stabilization process. The average tensile strength of resultant pitch‐based carbon fibers was over 800 MPa after carbonization at 1000 ° C for 10 min. It provided a simple method to adjust the spinnable pitch for pitch‐based carbon fiber preparation.