Abstract
New dicyanovinyl end-capped reactive oligomers 2—5 containing flexible alkyl units were prepared from the condensation reaction of diamines with 1-(p-formylphenyl)-1-phenyl-2, 2-dicyanoethene (1) by forming an azomethine linkage. Two arylate oligomers 7 and 8 containing azomethine bond were also prepared and compared with oligomers 2—5. All the oligomers were characterized by spectroscopies and elemental analysis. The reactive oligomers showed a good solubility in polar aprotic solvent such as N,N-dimethylformamide (DMF) and N,N-dimethylacetamide (DMAc), and they were partially soluble in common organic solvents such as tetrahydrofuran (THF) and acetone. Their thermal properties including melting temperature, curability and thermal stabilities were examined. These oligomers undergo a curing reaction around 280—340°C. Upon heating the oligomers, thermally stable and insoluble network polymers were obtained.
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