Chemical modification of poly(ether ether ketone) for size exclusion chromatography at room temperature: 1. Absolute molecular-mass determination for sulfonated PEEK

Organic solvent resistant poly(ether-ether-ketone) nanofiltration membranes

“…The accuracy of this type of measurement is arguable because the viscosity measurements were performed by dissolving the polymer powder in H 2 SO 4 95% v/v, which is very hygroscopic and any water uptake could increase the viscosity of H 2 SO 4 resulting in a considerable error for MW determination. Regardless of this source of variation, the values obtained for the polymer grades were within the range reported in the literature [34,35]. However, when looking at the viscosity of the dope solutions (Table 2) one can observe that the performance of the different membranes followed a trend: the higher the viscosity the tighter the membrane.…”

Molecular weight characteristics of polyetheretherketone (PEEK): analysis of determination conditions

“…Сульфирование проводили по методике [3]. Образцы растворяли в серной кислоте с плотностью не ниже 1,8355 г/см 3 и выдерживали при температуре 40°С 12 дня.…”

“…Альтернативным подходом представляется получение растворимых производных ПЭЭК. Например, сульфирование ПЭЭК обеспечивает получение производных этого полимера, растворимых в N-метилпирролидоне (N-МП), диметилсульфоксиде, диметилформамиде при комнатной температуре [3]…”

Direct Iminization of PEEK

“…For example, PEEK may be sulfonated at the hydroquinone residue simply by dissolving it at ambient temperature in concentrated (96-98%) sulfuric acid, and the resulting, amorphous, polysulfonate ionomer is soluble in dipolar aprotic solvents. 8,9 Lithium salts of sulfonated PEEK can then be analyzed by roomtemperature GPC in N-methylpyrrolidone. 10 Diphenyl sulfone, 2,2-diphenylethylamine and 3,3-diphenylpropylamine were purchased from Acros and were used without further purification.…”