| 摘要 |
A class of relatively low molecular-weight oligomers containing at least one isoimide group and terminal groups capable of undergoing an addition polymerization reaction are provided. These oligomers are characterized by excellent solubility in common solvents and a melting temperature considerably lower than their cure temperature, thus enabling the oligomers to be formed into cured polymers more slowly and at lower temperatures, all without the evolution of deleterious gases. The oligomers of the present invention may be formed by reacting an aromatic dianhydride with an aromatic diamine, followed by reaction with a monoanhydride. The resulting product is dehydrated to form the isoimide-containing oligomer.
|
