中文摘要：

以对甲苯磺酸（PTS）为催化剂，研究了改性温度、时间和改性剂苯甲醛用量对改性煤沥青（MCTP）中间相显微结构产生的影响。研究表明，当苯甲醛／煤沥青（CTP）质量比为30／100、反应温度为150℃和反应时间为15h时得到的MCTP，其中间相呈不完全纤维组织结构；XRD分析表明，通过苯甲醛改性煤沥青，有利于提高中间相光学组织结构的有序性。FT—IR分析表明，改性后芳核骨架振动吸收频率增大，提高了芳核的缩合度；^1H—NMR分析表明，改性过程中的改性反应主要发生在HA上，并对改性过程可能发生的反应机理进行了分析。

英文摘要：

Coal tar pitch （CTP） has been successfully modified with modifier benzaldehyde in the pres- ence of p-toluene sulfonic acid as catalyst. The main influence factors such as the mass ratio of benzal- dehyde to CTP, the temperature and reaction time on optical microstructure of mesophase formed by modified coal tar pitch （MCTP） were observed. The results showed that the optical microstructure of mesophase formed by carbonized MCTP, which was produced when the mass ratio of benzaldehyde to CTP was 0.3, the modified reaction kept for 15 h at 150 ℃, has the characteristic with incomplete fi- brous structure. The result of XRD revealed that order of optical microstructure of mesophase was en- hanced through modifying coal tar pitch. The results from FT-IR analysis indicated that the degree of condensation of aromatic ring increased according to the increment of vibration frequency of aromatic ring. The spectra from 1H-NMR indicated that the polymerization reaction mainly occurred in the HA position of aromatic rings. The possible reaction mechanism was proposed.