Abstract: High-modulus carbon fiber (HMCF) with different mechanical performance were produced from domestic high-strength-high-modulus carbon fiber (HSMMCF) through high temperature heat-treatment process with different process parameters.Mechanical performance,surface morphology and microstructure on the surface of resulting high modulus carbon fibers were studied using INSTRON universal testing machine,scanning electronic microscope (SEM),Raman spectra and X-ray diffraction analysis (XRD).The change of microstructure during the increase of Young's modulus of carbon fiber,and respectively correlated modulus with various of parameters of microstructure were mainly discussed.The results showed that the transforming of HSMMCF into HMCF highly was depend on high temperature heat-treatment process.Young's modulus was strongly correlate to the surface structure of carbon fiber,as it increasing with the rise of degree of graphitization on the surface and had linear relationship with R′s value.Also Young's modulus increased with the increase of crystallite size,crystallinity and the rise of degree of orientation,while there's linear relationship between Young's modulus and crystallite size as well as crystallinity.But the upward tendency was slowed with the increase of degree of orientation.
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