摘要
流变性是中间相沥青的重要物性。本文用高温旋转粘度计研究了几种中间相沥青的粘度—温度及流动曲线。沥青的粘度—温度曲线分软化、平稳流功、固化三部分。平稳流动区域的宽窄同原料的原始结构及软化点有关。中间相沥青在剪切作用下结构变形,表现为剪切变稀,是非牛顿流体。但在高温阶段,剪切变稀不明显,成为假牛顿流体。以玻璃化转变温度为参考温度,松驰因子:αΥ=(η/Τ)/(ηg/Τg),用WLF公式对粘度—温度曲线关联,0到较好的关联结果。根据沥青的流变性,找出有可能得到高性能材料的中间相沥青。
The rheological behavior of mesophase pitches is an important physical property. The viscosity-temperature relationship and flow curves of some of mesophase pitches are studied using high temperature rotational viscometer. The viscosity-temperature curve of a mesophase pitch can be divided into three parts: softening steady flow and solidification. The temperature width of steady flow region independent on the structure of feedstock and softening point. The structure of mesophase pitches is deformed and oriented by shear, resulting in thinning of the pitch system(non-Newtonign fluid). But it exhibits shear-thinning slightly in high temperature(pseudo-Newtonion fluid). The data of viscosity-temperature curves are correlated well with WLF equation, where glass transformation temperature is the reference temperature and the relaxation factor α_T equals. (η/T)/(η_g/T_g). According to the rheological behavior of all pitches studied, it is suggested that the high performance carbon materials may be produced by pitches similar to No. 5 pitch.
出处
《炭素技术》
CAS
CSCD
1990年第2期6-10,共5页
Carbon Techniques
