炭化温度对木材液化物碳纤维吸附特性及孔结构的影响

摘要

以速生杉木为原料,经过苯酚液化物后加入六次甲基四胺熔融纺丝,初纺纤维固化处理后直接炭化制备出碳纤维,并对碳纤维的比表面积、孔径分布以及吸附特性进行了研究。研究结果表明,木材液化物碳纤维样品的等温线属于典型的Ⅰ型吸附等温线,其吸附滞后回线属于H4型。木材液化物碳纤维孔径主要以微孔为主,微孔率达到73.4%。碳纤维样品的BET比表面积、微孔面积、微孔容随着炭化温度的提高呈增大趋势,其中600～800℃是其孔隙结构发生变化的关键温度区间。液化原料中木材/苯酚比对其制备的碳纤维的比表面积、孔容及孔径的影响变化不大。%After melt-spinning by adding hexamethylenetetramine and the curing treatment,carbon fibers were prepared from the phenolated Chinese Fir（Cunninghamia lanceolata） by using of direct carbonization method.The adsorption properties of carbon fibers were studied.The results show that the isotherms adsorption of carbon fibers belongs to the typical I type,and the closed hysteresis loops belongs to H4 type.Carbon fibers from liquefied wood mainly contain micropores,and the maximum micropores content up to 73.4%.With increasing heat-treatment temperature,BET surface area,micropore area and micropore volume of carbon fibers increased.Temperature rang 600-800℃ was the critical stage at which the pore structure of carbon fiber changed.wood/phenol ratio of raw have no influence on specific surface area,micropore volume and pore diameter of carbon fibers.