Fluoro-containing polyimide/polyimide and polyimide/PCTG blends

Tai Shung Chung*

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review


We have discovered several interesting fluoro-polyimides alloys which form fully miscible blends or partially miscible blends. These results confirm the general rules for miscible fluoro-polyimides pairs containing the hexafluoro iso-propylidene group if 1) the dianhydride composition is the same in each pair, and 2) the diamine is changed from the 3,3′ (meta substituted 6F diamine) to 4, 4′ (para substituted 6F diamine). The χ values calculated from the Flory-Huggins theory support this conclusion. We have also identified two ternary miscible fluoro-polyimide blends. They are 6FDA-3,3′ 6F-diamine /6FDA-4,4′ 6F-diamine/ BTDA-4,4′-6FDA blend and 6FDA-3, 3′-6F-diamine/6FDA-4, 4′-6F-diamine / ODPA-PMDA-4,4′-6F-diamine blend. Their miscibility probably arises from the fact that their diamine parts have hexafluoro isopropylidene groups, their dianhydride parts have similar bond angle, space, rigidity and length. In addition, several 6FDA-polyimide and PCTG 5445 (modified polyester) miscible blends were discovered. These surprising results suggest that hexafluoro-isopropylidene-group containing polyimides are quite intermolecularly active and the 1,4-cyclohexane dimethanol component in PCTG 5445 may also offer unique miscibility capability.

Original languageEnglish (US)
Number of pages5
StatePublished - 1997
Externally publishedYes
EventProceedings of the 1997 55th Annual Technical Conference, ANTEC. Part 3 (of 3) - Toronto, Can
Duration: Apr 27 1997May 2 1997


OtherProceedings of the 1997 55th Annual Technical Conference, ANTEC. Part 3 (of 3)
CityToronto, Can

ASJC Scopus subject areas

  • General Chemical Engineering
  • Polymers and Plastics


Dive into the research topics of 'Fluoro-containing polyimide/polyimide and polyimide/PCTG blends'. Together they form a unique fingerprint.

Cite this