High-temperature steam-treatment of PBI, PEEK, and PEKK polymers with H2O and D2O: A solid-state NMR study

Enhancing resistance of poly(ether ketone ketone) to high‐temperature steam through crosslinking and crystallization control

“…Little has been reported on the effect of high‐temperature steam on PAEKs, however. A series of high‐temperature steam treatment studies of PEEK, PEKK, and their blends with poly(benzimidazole) revealed that moisture absorption by these materials is reversible when exposed to steam up to 288 °C, but chemical degradation occurs in steam at 316 °C . In a steam sterilization study, PEEK was found to exhibit an increase in strength and stiffness and a decrease in ductility after being subjected to 134 °C steam for 1000 h .…”

“…Little has been reported on the effect of high-temperature steam on PAEKs, however. A series of high-temperature steam treatment studies of PEEK, PEKK, and their blends with poly(benzimidazole) revealed that moisture absorption by these materials is reversible when exposed to steam up to 288 C, but chemical degradation occurs in steam at 316 C. [21][22][23] In a steam sterilization study, PEEK was found to exhibit an increase in strength and stiffness and a decrease in ductility after being subjected to 134 C steam for 1000 h. 24 This behavior was attributed to slight increases in crystallinity and/or reductions in internal stresses. Increases in crystallinity are not favorable because it results in dimensional changes, embrittlement, and reduced sealing performance of the manufactured PAEK component.…”

Structures and Dynamics of Secondary and Tertiary Alkylphosphine Oxides Adsorbed on Silica

“…Encouraged by the meaningful results obtained with 1 Hw ideline NMR of adsorbed metallocenes [12][13][14][15][16] andm obile species in polymers [50] we probed 4 and 4a with this technique. The proton wideline spectrum of 4 shows as ignal that is broadened by large homonuclear dipolar interactions [17][18][19] and spans from about À110ppm to + 120 ppm, with ah alfwidth of ca.…”

Исследование Эффектов Дейтерозамещения В Полимерной Мембране С Помощью ИК Фурье-Спектрометрии

“…Отметим, что в работе [30] методами FTIR было исследовано набухание Нафиона в воде с различным изотопным составом. Следует отметить, что исследования изотопических эффектов при взаи-модействии полимеров с обычной и тяжелой водой актуальны [31][32][33][34][35]. Отметим также, что мы в нашей группе также изучаем свойства Нафиона, вымачиваемо-го в различных жидкостях, по методике хемилюминес-центной [36] и флуоресцентной спектроскопии [36][37][38][39].…”