To develop colorless and soluble polyimide films, a novel dianhydride containing 1,4:3,6-dianhydro-D-mannitol unit, 2,5-bis(3,4-dicarboxyphenoxy)-1,4:3,6-dianhydromannitol dianhydride (IMDA) was synthesized. And two series of polyimides were prepared via a two-step thermal imidization, PI−(1–4) were obtained from IMDA and four kinds of aromatic diamines while PI−(5–7) from IMDA and three kinds of semiaromatic diamines. All the polyimides were readily soluble in common polar solvents and could afford flexible, tough and colorless films with transparency up to 89% at 450 nm. Especially, polyimides simultaneously containing 1,4:3,6-dianhydrohexitol units in diamine and dianhydride exhibited comparable optical and soluble performance with the alicyclic fluorinated ones. Meanwhile, it was certified that 1,4:3,6-dianhydrohexitol fragment in dianhydride was more determinant in solubility and transmittance of polyimides than that in diamine. An overall investigation of these polyimides on thermal, mechanical, morphological, soluble, optical and dielectric properties was presented, and their structure-property relationships were discussed in detail.

为了开发无色且可溶的聚酰亚胺薄膜，一种新型的二酐包含1,4：3,6-二脱水-D-甘露醇单元，2,5-双（3,4-二羧基苯氧基）-1,4：3,6-二脱水甘露醇二酐（IMDA）被合成。并通过以下方法制备了两个系列的聚酰亚胺两步热酰亚胺化反应是从IMDA和四种芳香族二胺中获得PI-（1-4），而从IMDA和三种半芳香族二胺中获得PI-（5-7）。所有的聚酰亚胺都易溶于普通极性溶剂中，并能提供柔韧性，坚韧和无色的薄膜，在450 nm处的透明度高达89％。特别地，同时在二胺和二酐中包含1,4：3,6-二脱水己糖醇单元的聚酰亚胺表现出与脂环族氟化物相当的光学和可溶性性能。同时，已证明二酐中的1,4：3,6-二脱水己糖醇片段比二胺中的聚酰亚胺的溶解度和透射率更决定性。对这些聚酰亚胺的热，机械，形态，可溶性，光学和介电性能进行了全面研究，