关键词: 对甲基酚醛树脂, 热裂解, 聚并苯

Abstract: The structural characteristic of products obtained from the pyrolysis of para-cresol-formaldehyde resin in the temperature range of 500 to 1000' Cis discussed in detail on the basis of elemental analysis, IR, X-ray diffraction and ESR spectra. The results of the analyses show that all the samples appear as black powder, which are insoluble and infusible, and have a wide range of electrical conductivity, X-ray diffraction measurements show all of the peaks are broadened, indicating that these samples are amorphous. The interlayer distances (d_c) almost do not vary with an increase in T_p. The crystallite sizes (L_c) are larger than phenol-formaldehyde resins. These results show that all of the samples have slightly aligned crystallites or local molecular orientations which contain four to five fragmental layers stacked on average along the c-axis of each crystallite. Electron spins with a π-nature exist in all the pyrolyzed samples. The ESRlinewidth and the spin concentration of the samples vary with T_P. The spin concentration becomes maximum and the linewidth is minimum at T_p=600℃.

Key words: Para-cresol-formaldehyde resin, Pyrolysis, Polyacene