In order to enlarge the use of coal tar pitch(CTP) in paving road, CTP and 60th paving pitch (PP) were extracted by n-heptane, toluene and ethanol step by step in a Soxhlet apparatus. The three fractions of CTP and PP were detected using UV-absorption(UV-A) ,elemental analyses(EA) and nuclear magnetic resonance (NMR) firstly as a whole unit after quality characterization of physical nature of CTP and PP were finished. The CTP had more saturate aliphatie and residue compounds dissolved in ethanol. On the other hand there were more continental type structures of aromatic ring than that of PP. There was almost no residue in PP after extracted by ethanol. The results explained why CTP was crisp in cold winter and was soften in summer. The following research will focus on how to change the chemical construction of CTP into the relative similar structures with those of PP through adding polymer.
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机译：Blends of hydrophobic and swelling agents in the swelling layer in the preparation of delayed-release pellets of a hydrophilic drug with low MW: Physicochemical characterizations and in-vivo evaluations
机译：Preliminary Phenotypic and SNP-Based Molecular Characterization of Maize (Zea maysL.)-Mexicana (Zea maysSSP. Mexicana) Introgression Lines under Inbred Background of 48-2
