Journal
POLYMER
Volume 55, Issue 18, Pages 4577-4585Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2014.07.027
Keywords
Steam-treatment of PBI, PEEK, PEKK; Solid-state NMR; Water and D2O uptake polymers
Categories
Funding
- Welch Foundation [A-1706]
- National Science Foundation [CHE-0911207, CHE-1300208, CHE-0840464]
- APPEAL Consortium at Texas AM University
- Hoerbiger Corporation of America, Inc.
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1300208] Funding Source: National Science Foundation
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Polyaryletherketones (PAEK) in blend systems with polybenzimidazoles (PBI) are of commercial interest due to their increased service temperature and reduction in abrasive wear against soft counterfaces when compared to PAEK alone. ASTM standard tensile specimens of PBI, polyetheretherketone (PEEK) and polyetherketoneketone (PEKK) are immersed in stirred D2O at room temperature, and additional samples are contacted with D2O steam at temperatures of 150 and 315 degrees C. All samples are studied by TGA, IR, C-13 CP/MAS, H-1 wideline, and H-2 MAS NMR. Changes in the physical appearance of the sample's and the extent of D2O uptake are described. Different locations, mobilities, and types of water and protons in the polymers are identified and studied and it is proven that PBI contains the largest amounts of D2O after exposure under all conditions. PEEK and PEKK only incorporate minimal amounts of D2O even when steam-treated at 315 degrees C. (C) 2014 Elsevier Ltd. All rights reserved.
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