| Abstract: | Several new polyamides ( 3a–d , 6a–d , 7a and 7b ) containing dibenzothiophenediyl units were prepared by low temperature solution polycondensation of dibenzothiophenediamines ( 1a, b ) with aromatic diacyl dichlorides ( 2a, b ) or of aromatic diamines ( 5a, b ) with dibenzothiophenediacyl dichlorides ( 4a, b ). Some of the polymers were soluble in polar amide solvents or DMSO. All the polymers possess inherent viscosities in the range of 0,6 to 1 dl/g. Thermal stability and crystallinity were determined. The resulting polyamides were found to be much more stable than the corresponding polymers having open-chain linkages. |
