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| The curing reaction of phenolic fibers |
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| 中国科学院山西煤炭化学研究所炭材料重点实验室 |
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Cite this article:
;. The curing reaction of phenolic fibers. Chin J Mater Res, 2005, 19(1): 28-34.
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Abstract Phenolic fibers were prepared by the cross--linking of heat-meltable spun filaments
derived from the melt--spinning of a novolak resin in a combined solution of
formaldehyde and hydrochloric acid. The physical and chemical changes of the fibers
during curing reaction were investigated. The results show that formaldehyde with
high concentration can increase both the content of the crosslinking agent and the
swellability with the resin. Hydrochloric acid not only promotes the formation of
$^{+}$CH$_{2}$OH as a catalyst, but also leads the polymer branching occurring.
It is found that under the conditions of formaldehyde concentration of 18.5\%,
hydrochloric acid concentration of 12\%, and the heating rate of 15.4℃/h,
the highly homogeneous crosslinking fibers with the maximum tensile strength of the 260 MPa
can be obtained, suggesting that the crosslinking rate in both the skin and the
inner of the fibers and the curing time are well--matched in these conditions,
and the carbon yield of the fibers at 800℃ was 63\%.
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Received: 11 March 2005
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