申请人:The Boeing Company
公开号:EP0311735A2
公开(公告)日:1989-04-19
High thermal stabilities are achievable in linear or multidimensional sulfone, solvent resistant oligomers by incorporated oxazole, thiazole, or imidazole linkages into the oligomer backbone. Blended oligomers of crosslinking oligomers and noncrosslinking compatible polymers are also described. The oligomers include residues of four-functional compounds of the formula:
(or isomers thereof) wherein M = -CO-, -S-, -0-, -SO2- or -(CF3)2C-; and Y = -OH, -SH, or -NH2.
In an improved method, the reactants are condensed at .or below ambient temperature in the presence of pyridine in a suitable solvent such as N,N'-dimethylacetamide (DMAC).
通过在低聚物骨架中加入噁唑、噻唑或咪唑链节,可在线性或多维砜类耐溶剂低聚物中实现高热稳定性。此外,还介绍了交联低聚物和非交联兼容聚合物的混合低聚物。这些低聚物包括式中四官能团化合物的残基:
(或其异构体),其中 M = -CO-、-S-、-0-、-SO2- 或 -(CF3)2C-;Y = -OH、-SH 或 -NH2。
在一种改进的方法中,反应物在.或低于环境温度下,在吡啶存在下,在合适的溶剂如 N,N'-二甲基乙酰胺(DMAC)中缩合。