可溶性无色透明FFDA-PMDA-ODA共聚聚酰亚胺的合成与性能

Synthesis and Properties of Soluble Colorless Transparent Copolymerized Polyimide Based on FFDA-PMDA-ODA

用9,9-双(3-氟-4-氨基苯基)芴(FFDA)与4,4'-二氨基二苯醚(ODA)作为二胺,以1,2,4,5-均苯四甲酸二酐(PMDA)为二酐,以DMF为溶剂,通过化学酰亚胺化法制备PI(FFDA-PMDA-ODA)。由于引入氟基团、柔性醚键和芳香刚性非平面共轭结构,PI具有较好的溶解性,优异的光学透明性和良好的热稳定性。其可见光区透过率超过80%,紫外截止波长低至368 nm;玻璃化转变温度高达370℃,5%的热失重温度为558℃,10%的热失重温度高达585℃。

PI（ FFDA-PMDA-ODA） was synthesized via the chemical imidization process by using 9,9-bis（ 3-fluoro-4-aminophenyl） fluorene（ FFDA） and 4,4-oxybisbenzenamine as the diamine monomer,pyromellitic dianhydride as the dianhydride monomer in dimethylformamide（ DMF）. Because PI（ FFDA- PMDA- ODA） had fluorine groups,flexible ether linkages and aromatic rigid non- planar conjugated structures, so it had good solubility, excellent optical transparency and good thermal stability. The visible light transmittance of PI（ FFDA-PMDA-ODA） was over 80%,the UV cutoff wavelength was as low as 368 nm. Its glass transition temperature was as high as 370 ℃,5% thermal decomposition temperature was 558 ℃,10% weight loss temperature was up to 585 ℃.