Cross-linkable polyimide polymers having at least one repeating unit of the structure of:
wherein n is the number of repeating groups and A is a tetravalent aromatic organic radical wherein each pair of carbonyl groups are attached to adjacent carbons in the ring moiety A.
It has been found that polyimides having the structure of formula I may be crosslinked at surprisingly low temperatures when heated from about 75 to about 110°C to form infusible and solvent resistant shapes, thereby rendering them useful in the preparation of film,s laminates and composites where inertness to solvents is a prerequisite.
具有以下结构的至少一个重复单元的可交联聚
酰亚胺聚合物:
其中 n 是重复基团的数目,A 是四价芳香族有机基,其中每对羰基连接到环分子 A 中的相邻碳上。
研究发现,具有式 I 结构的聚
酰亚胺可在令人惊讶的低温下交联,当温度从约 75°C 加热到约 110°C 时,可形成可渗透和耐溶剂的形状,从而使其可用于制备薄膜、层压板和复合材料,其中对溶剂的惰性是一个先决条件。