New polyimides have been prepared from the reaction of aromatic dianhydrides with novel aromatic diamines containing carbonyl and ether connecting groups between the aromatic rings. Several of these polyimides were shown to be semi-crystalline as evidenced by wide angle x-ray diffraction and differential scanning calorimetry. Most of the polyimides form tough solvent resistant films with high tensile properties. Several of these materials can be thermally processed to form solvent and base resistant moldings.
新的聚
酰亚胺材料是通过芳香族二酸酐和含有芳香族环之间连接羰基和醚基的新型芳香族二胺反应制备而成。通过广角X射线衍射和差示扫描量热法,证明其中一些聚
酰亚胺具有半晶态结构。大多数聚
酰亚胺形成耐溶剂的坚韧膜,并具有高拉伸性能。其中数种材料可以经过热加工处理,形成耐溶剂和耐碱的模塑件。