CARBONIZATION OF METHYLENE-BRIDGED AROMATIC OLIGOMERS

Methylene-bridged oligomers were prepared from naphthalene, binaphthyl, anthracene, tetralin, biphenyl, dibenzofuran, and xanthene by condensation reaction with methyral. These oligomers, NC, BNC, ANC, TETC, BPC, DBC, and XANC, respectively, were carbonized under atmospheric pressure. The oligomers can be classified into two groups from the optical textures of their resultant cokes (i.e., the first group consisting of BPC, DBC, and XANC exhibited isotropic textures after carbonization at 470-degrees-C while the second group of NE (NC), BNC, ANC, and TETC produced the anisotropic textures of wide-flow domain type). The differences in carbonization properties among the oligomers are studied from the viewpoint of structural changes during carbonization, on the basis of field desorption mass spectrometric analysis.