Gas transport properties of substituted PEEKs

✍ Scribed by Y. Paul Handa; Jacques Roovers; Pierre Moulinié

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 189 KB
• Volume: 35
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(199710)35:14<2355::aid-polb13>3.0.co;2-b

✦ Synopsis

Tert-butyl and di-tert-butyl were added as pendant groups to the etherether phenyl ring of poly(ether ether ketone), PEEK. tert-butyl PEEK, TBPEEK, was amorphous and di-tert-butyl PEEK, DBPEEK, was semicrystalline. However, a 2 : 1 random copolymer of TBPEEK and DBPEEK, TBDBPEEK, was amorphous. Gas transport of N 2 , O 2 , CH 4 , and CO 2 through amorphous films of PEEK, TBPEEK, TBDBPEEK, and tetramethylbiphenyl PEEK were determined at 35ЊC and at pressures to about 15 atm. The results support previous observations that tert-butyl and tetramethylbiphenyl groups are very effective in disrupting chain packing in the polymer. For the present polymers, these substitutions led to a 5-18-fold increase in permeability, and, in some cases, at no loss in permselectivity.