分别采用两种联苯型二酐单体,对称结构的3,3',4,4'-联苯四甲酸二酐(s-BPDA)以及不对称结构的2,3,3',4'-联苯四甲酸二酐(a-BPDA)与含氟芳香族二胺1,4-双(4'-氨基-2'-三氟甲基苯氧基)联苯(TFDAB)通过两步缩聚法制备了两种聚酰亚胺材料PI-1(s-BPDA/TFDAB)与PI-2(a-BPDA/TFDAB).研究结果表明,不对称结构可以显著增加PI薄膜在可见光区的透明性.25μm厚的PI-2薄膜在450nm处的透光率达到93%,而同样厚度的PI-1薄膜的透光率只有67%.此外,在PI分子结构中引入不对称结构不会牺牲材料的耐热稳定性、力学性能与介电性能.
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