Synthesis and properties of flourine-containing polyimides

✍ Scribed by Chun-Shan Wang; Rong-Wen Yang

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 182 KB
• Volume: 66
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19971024)66:4<609::aid-app1>3.0.co;2-w

✦ Synopsis

A series of new fluorine-containing polyimides have been synthesized from the condensation of 2,2-bis[4-(4-aminophenoxy)phenyl]propane, 2,2-bis[4-(4-aminophenoxy)phenyl] -1,1,1,3,3,3 -hexafluoropropane, or 2,2 -bis[4 -(4 -amino -2 -trifluoromethylphenoxy)phenyl]-1,1,1,3,3,3-hexafluoropropane with various aromatic dianhydrides. The dielectric constant at 1 KHz in the fluorine-containing polyimides decreases from 3.51 to 2.72 as fluorine content increases. The poly(amic acid)s had inherent viscosities of 0.52-1.23 dL/g, depending on the diamines and dianhydrides. Most of the resulting polymers showed an amorphous nature and afforded flexible and tough films. The amount of moisture absorption decreases as fluorine content in polyimides increases. The glass transition temperatures of these polyimides were in the range of 287-328ЊC, and the 10% weight loss temperatures were above 542ЊC in nitrogen.