【摘要】 采用成熟的合成工艺制备出三种分子量大小分布不同的Copna树脂,经相同条件的固化、炭化和石墨化处理(900,1 500,2200,2600和3000℃,2 h)。用热分析仪对固化树脂进行测试;X射线衍射、氦气吸附真密度仪和粉体电阻率测试仪对树脂炭进行性能测试。结果表明Copna树脂的分子量大小和分布范围对固化树脂的热失重行为有重要影响;分子量越大,分布越窄,3000℃处理得到的树脂炭中石墨化组分越多;分子量越大,分布越宽,树脂炭的表观密度越高,孔含量越小。而树脂分子量对树脂炭的粉末电阻率的影响极小。更多还原

【Abstract】 Three condensed polynuclear aromatic resins with different molecular weights( Mws) and Mw distributions were heated at 900,1500,2200,2600 and 3000 ℃ for 2 h. The resulting carbons were characterized by XRD,helium pycnometry and a powder electrical resistance test. The graphitic,amorphous and turbostratic constituents in the carbons were obtained from XRD. Results showed that both the Mw and the Mw distribution in the resins played important roles in the properties and constituents of the carbons produced from them. The larger the Mw and the narrower the Mw distribution,the higher the graphitic content in the carbons produced at 3 000℃. The larger the Mw and the wider the Mw distribution,the higher the apparent density of the carbons produced at the same pyrolysis temperature. The effect of Mw on the powder resistance of the carbons is negligible.更多还原