| 内容提要: |
Carbon fiber is a kind of new polymer material with excellent mechanical properties and being applied widely, and the process of carbon fiber prepared by bamboo tar, including extraction, condensation, spinning, oxidation and carbonation, is influenced by the pyrolysis kinetics significantly. In this paper, the Thermogravimetric Analysis (TGA) of bamboo tar produced in the process of pyrolysis and gasification of the bamboo which is known as Phylostachyssulphurea， was analyzed by the Distributed Activation Energy model (DAEM), so as to understand the kinetic properties and parameters of bamboo tar. The thermogravimetric analysis of bamboo tar which is used as the raw material of carbon fiberunder 5 different heating rates (i.e. 5, 10, 15, 30, 50 ℃min-1, etc.) in nitrogen atmosphere was studied. The results show that the activation energy of bamboo tar and the exponential factor (or frequency factor) increase significantly with the increase of the heating rate, and the low heating rate is advantageous to the extraction of bamboo tar solvent and the thermal polycondensation, which can provide scientific reference for the optimization of carbon fiber technology. The thermal weight results show that the temperature range of bamboo tar being decomposed rapidly is 213~410℃. The ranges of the activation energy were calculated by DAEM have small difference through the comparison of five heating rate when the value of conversion rate is 0.1~0.6 and the average value is 119 kJ mol-1. The stability range of the activation energy is enlarged as the conversion rate is greater than 0.6 and heating rate increase. |