摘要
用热失重分析方法研究了磷酸铵盐、磷酸、硫酸铵对粘胶纤维的热分解促进作用。空气的存在有利于磷酸氢二铵对粘胶的分解反应 ,但对其余几种的影响不大。本文提出用峰高 半高宽之比表征热分解峰的形态。该值越低 ,即热分解峰越平坦 ,表明反应越缓和 ,则越有利于提高粘胶纤维的碳化活化得率。实验结果证实了这一观点。磷酸氢二铵 粘胶的热分解峰最平坦 ,作用效果最好 ;磷酸二氢铵和磷酸相当 ,磷酸铵次之 ,硫酸铵作用时比表面积很低。未预浸处理的粘胶热分解最激烈 ,产品得率和比表面积也最低。
With the help of thermal gravimetric analysis (TGA), the pyrolyses of rayon have been studied respectively by using impregnants phosphoric acid (PA),its three ammonium salts and ammonium sulfate (AS). The air is favorable for the pyrolysis of rayon treated by dibasic ammonium phosphate (DAP), but useless for those of the other impregnants. It is put forward that the ratio of height to half-height-width (H/W 1/2 ) of a peak on a differential thermal gravimetric (DTG) curve could be used to describe the peak's shape character. The smaller the ratio is, i.e. the more flatten the peak is , the more moderately the thermal decomposition reaction carries out , which would lead to higher carbonization and activation yields of rayon. The experimental results prove this point of view. According to expectation, DAP's function is the best, ammonium dihydric phosphate's (ADP) is equal to PA's, ammonium phosphate's(AP)is worse;AS has lower specific surface area, and no-impregnant gives the lowest yield and specific surface area.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2004年第5期688-692,共5页
Journal of Materials Science and Engineering
基金
上海市科委重大科研资助项目 (0 2DZ1 1 0 1 4 )
关键词
牯胶活性碳纤维
热失重分析
峰高/半高宽比
得率
rayon-based activated carbon fiber
thermal gravimetric analysis (TGA/DTG)
the ratio of height to half-height-width of peak
yield
