【摘要】 利用元素分析、TG、DSC、FT IR、XRD和STM等手段研究了各向同性沥青和各向异性沥青基炭纤维的不熔化、炭化和石墨化工艺过程,对不熔化过程的反应机理进行了推导,并计算出不熔化反应的动力学参数。同时还研究了石墨化过程中,纤维的力学性能和结晶参数的变化。研究结果表明,在制备沥青基炭纤维工艺过程中,各向同性沥青纤维(APF)的最佳氧的质量分数为 19.63%, 而各向异性沥青纤维 (APF)的最佳氧的质量分数为8.03%。各向同性沥青基石墨纤维(IPGF)的d002, Lc, La分别为 0.343 2nm、3.432nm和 8.053nm, 而各向异性沥青基石墨纤维(APGF)的d002、Lc、La分别为 0.339 1nm、25.69nm和 53.05nm。IPGF的拉伸强度和模量分别为596MPa和 58GPa,而APGF的拉伸强度和模量分别为 2 956MPa和 632GPa。更多还原

【Abstract】 The stabilization, carbonization and graphitization processes in the preparation of isotropic and anisotropic pitch fibers were studied by elemental analysis, TG, DSC, FT-IR, XRD and STM. The reaction mechanisms were deduced and kinetics parameters evaluated. The change of mechanical properties and crystalline parameters during graphitization were also obtained. Results show that the optimum oxygen content for isotropic pitch fibers is 19.63w/%, but that for anisotropic pitch fibers is 8.03w/%. The d₀₀₂, Lc, La of isotropic pitch based graphite fibers （IPGF） are （0.3432）, 3.432 and 8.053nm respectively, while for anisotropic pitch based graphite fibers （APGF） they are 0.3391, 25.69 and 53.05nm. Tensile strength and modulus are respectively 596MPa and 58GPa for IPGF, and 2956MPa and 632GPa for APGF.更多还原