以3,5-二氨基苯甲酸(35DABA)、4,4’-二氨基二苯醚(44ODA)和3,3’,4,4’-四甲酸联苯二酐(BPDA)为原料,在强极性非质子有机溶剂中进行聚合反应,制得了高粘度含羧基聚酰胺酸(CPAA)溶液,经涂膜、热亚胺化,得到了坚韧透明的含羧基聚酰亚胺(CPI)薄膜,并对其性能进行了研究.结果表明:CPI薄膜具有较高的表面能,在宽广的频率范围内,其电容、介质损耗基本保持不变,具有良好的高低频稳定性；薄膜的强度与韧性均较高,可应用于制作高性能柔性覆铜板；薄膜在紫外线短波长区具有良好的吸收能力,其截止波长为320 nm,在可见光波长范围内,其透过率达80％以上.
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