Effects of Chemical Curing Temperature and Time on the Properties of Liquefied Wood based As-cured Precursors and Carbon Fibers

Junbo Shang, Jian Lin, Guangjie Zhao, Jianhui Zhang, Zimu Su, Sicen Guo

Abstract


Liquefied wood based as-cured precursors and carbon fibers prepared by different chemical curing processes were carried out to investigate the effects of curing temperature and time on the thermostability and microstructure of liquefied wood based precursors, the tensile strength of carbon fibers as well. The primary fibers can be converted into precursors with high performance by directly heating at target curing temperature. With the temperature and duration increasing, the numbers of methylene bonds in precursors increased, resulting in the enhancement of cross-linkages among molecular chains and then the improvement of thermostability of precursors. Carbon fibers prepared from as-cured precursors (curing temperature 95 oC, curing time 3h) had the minimum value of the average interlayer spacing (d002), it also showed the highest tensile strength, almost 800 MPa, which can be classified as fibers of general grade.

Keywords


Chemical curing, As-cured Precursor, Carbon fibers, Tensile strength

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