《Table 2 Normalized integration data based on the solid13C-NMR spectra of basic pitches and spinnabl

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《沥青前驱体氧形态对其沥青与炭纤维性能的影响（英文）》

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Cal 1，methyl carbon.Cal 2.1，methylene carbon in bridge structure.Cal2.2，CH2carbon in naphthene group.Co1，carbon in CO（CHO，COOH or CO）.Co2，carbon in CH2OH，OCH3or C—O—C.Car 3，aromatic carbon bound to hydrogen.Car 4.1，crosslinkedaromatic carbon

The general properties of three basic pitches（P200，P250，P300）were listed in Table 1.The SP，CY and n-hexane insoluble（HI）fractions of three basic pitches increased w ith increasing distillation temperature.The maximum SP，CY and HI w ere 158℃，30.2%and 48.4%，respectively，w hich w ere attained from the P300.The increase of SP and CY suggested that more light components w ere removed as confirmed by the TG curves in Fig.1（a），w hich show that temperature of initial w eight loss is higher for P300 than that for P250 and P200.Furthermore，all of three basic pitches w ere completely soluble in toluene，w hich meant that the molecular w eight w as relatively small and no large molecules w ere formed[15].M oreover，the elemental analysis of basic pitches show ed that C content increased and H content decreased w ith increasing distillation temperature.In addition，all of three basic pitches had low contents of O and S.