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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。
Starting from 3,5-diaminobenzoic acid (35DABA), 4,4’-diaminodiphenyl ether (44ODA) and 3,3 ’, 4,4’-tetracarboxylic acid biphenyl dianhydride (BPDA) Strong polar aprotic organic solvent was polymerized to obtain a high viscosity carboxyl group-containing polyamic acid (CPAA) solution, the coating, thermal imidization, has been a tough transparent carboxyl-containing polyimide (CPI) film , And studied its performance. The results show that the CPI film has a high surface energy, its capacitance and dielectric loss remain basically unchanged over a wide frequency range, and has good high and low frequency stability. The film has high strength and toughness and can be used in the fabrication High-performance flexible copper clad laminate; thin film in the short wavelength UV region has good absorption capacity, the cut-off wavelength of 320 nm, in the visible wavelength range, the transmittance of more than 80%.