摘要
采取软、硬二种沥青与一,二,四苯基硅烷混合物共炭化方式,考察了硅取代聚芳烃中间相的生成。该炭化过程在反应釜中进行,控制实验条件如下:氩气压强1MPa,温度440℃,热裂解时间5h～10h。研究表明:含2%元素硅的初始混合物,不生成硅取代中间相;添加1.0%和0.5%元素硅的硬沥青炭化时明显生成硅取代中间相,但不是单一相。热裂解残留物是硅取代中间相体和均匀分散其中的无硅中间相小球体构成的复合相。
The synthesis of siliconsubstituted polyaromatic mesophase was investigated using a copyrolysis of a filtered coal tar soft pitch with mono, di, tri, and tetraphenylsilane. The copyrolysis of pitch/silane mixtures containing 2?% silicon was studied at a constant argon pressure of 1?MPa and temperatures ranging from 420?℃ to 460?℃. Residue and silicon yields as well as solubility, glass transition temperature and coke yield of the pyrolysis residues were determined. Microstructures of the residues and corresponding silicon distributions were studied by polarized light microscopy and electron probe microanalysis, respectively. Silicon yields depend on volatility and reactivity of the silanes resulting from the degree of phenyl substitution. The pyrolysis residues show up to three different coexisting phases: (a) an optically anisotropic phase with a coarse mosaiclike texture and negligible silicon content, (b) an optically isotropic phase with high silicon content, and (c) an optically anisotropic phase with a fine mosaiclike texture and medium silicon content. The latter phase, preferentially obtained with di and triphenylsilane should correspond to a strongly disturbed, siliconsubstituted mesophase.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
2003年第2期81-88,共8页
New Carbon Materials
