摘要
以木材苯酚液化物为原料,加入六次甲基四胺熔融纺丝后,经甲醛和盐酸溶液固化处理、炭化后得到木材液化物碳纤维。通过纸框拉伸检测法研究了炭化工艺条件对碳纤维力学性能、炭化率等的影响。结果发现:木材液化物碳纤维的力学性能随着炭化温度和炭化时间的增加而显著提高;随着炭化升温速率的增加而逐渐下降。同时,原料中木材/苯酚比越大,其碳纤维的拉伸强度和拉伸模量增幅比例越大,且直径收缩越小。木材液化物碳纤维在合适的炭化条件下拉伸强度、拉伸模量和炭化率可分别达到1.7 GPa、159 GPa和60%。
The carbon fiber precursors were prepared from liquefied wood in phenol by adding hexamethylenetetramine and soaking in the solution containing hydrochloric acid and formaldehyde as the main components. The carbon fibers were obtained from the precursors by the direct carbonization. The influence of the carbonization condition on the mechanical properties and yield of the carbon fibers was investigated by the paper frame method. The results show that the mechanical properties of the carbon fibers increase obviously with increasing carbonization temperature and time, but decrease with increasing the heating rate. It is also found that the higher the wood/phenol ratio, the higher the increasing amplitude of mechanical properties, and the smaller the dimension shrinkage. Carbon fibers from liquefied wood with tensile strength of 1.7 GPa, tensile modulus of 159 GPa and yield of 60% were reached under optimal carbonization conditions.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2008年第5期74-78,共5页
Acta Materiae Compositae Sinica
基金
国家自然科学基金项目(30471351)
天津科技大学引进人才科研启动基金项目(20070447)
关键词
碳纤维
木材液化物
炭化条件
拉伸强度
carbon fibers
liquefied wood
carbonization conditions
tensile strength
