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2-氯-5-硝基三氟甲苯与4,4'-二羟基二苯砜经亲核取代反应得到2,2-双[4-(4-硝基-2-三氟甲基苯氧基)苯基]砜(Ⅰ),然后在Pd/C和水合肼作用下发生还原反应得到2,2-双[4-(4-氨基-2-三氟甲基苯氧基)苯基]砜(Ⅱ).该二胺单体Ⅱ分别与均苯四甲酸二酐(PMDA)、3,3',4,4'-联苯四酸二酐(BPDA)、3,3',4,4'-二苯醚四酸二酐(ODPA)和3,3',4,4'-二苯甲酮四酸二酐(BTDA)进行低温缩聚反应得到聚酰胺酸,经热酰亚胺化制备出4种砜基取代含氟聚酰亚胺(PI)薄膜.结果表明,这些PI薄膜均具有良好的光学透明性和溶解性,其中ODPA基PI薄膜的光学透明性最好,450 nm处的透光率达到85.4%.

参考文献

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[4] Chin-Ping Yang;Hsun-Ching Chiang .Organosoluble and Light-colored Fluorinated Polyimides Based on 9,9-bis[4-(4-amino-2-trifluoromethylphenoxy)phenyl]fluorene and Aromatic Dianbydrides[J].Colloid and Polymer Science,2004,282:1347-1358.
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[6] 刘金刚,张秀敏,孔祥飞,杨士勇.无色透明耐高温聚酰亚胺薄膜的制备与性能研究[J].功能材料,2006(09):1496-1499.
[7] Jang W;Shin D;Choi S;Park S;Han H .Effects of internal linkage groups of fluorinated diamine on the optical and dielectric properties of polyimide thin films[J].Polymer: The International Journal for the Science and Technology of Polymers,2007(7):2130-2143.
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