Poly PEEK Synthesis
Materials and synthesis Poly (viny alcohol) (PVA) (99%, Mw. 1,15,000; Loba ) was dried in a hot air oven about 80 ºC at least 12 hours before to use. Poly(oxy-1,4-phenylenecarbonyl-1,4-phenylene) (Mw. 20,800; Sigma aldrich) (PEEK) pellets were dried at 100 ºC in hot air oven overnight before to the sulfonation process. Montmorillonite K10 (Na+MMT) (Himadia), Ion exchange resin (CDH), sulfuric acid (1.84 g cm-3, 98 wt%; Merck), Dimethyl sulfoxide (DMSO) and methanol were used as recieved. SPEEK Synthesis SPEEK was prepared through the via of sulfonation reaction by using concentrated sulfuric acid at desired temperature. The dried PEEK pellets were ground well with the help of a martter for reducing dissolution time of the PEEK polymer. 5 …show more content…
Bahavan Palani, R. Kannan, S. Rajashabala, S. Rajendran, G. Velraj, Ionics (2014); DOI: 10.1007/s11581-014-1193-1; P Bahavan Palani, K.Sainul Abidin, R Kannan, M.Sivakumar, Fu-Ming Wang, S Rajashabala, G Velraj, RSC Advances (2014); DOI: 10.1039/C4RA10788H]. The Na+MMT is dispersed in distilled water with contineous stirring about 48 hours at room temperature. The well dispersed homogeneous solution was passed through the ion exchange resin many times to ensure the complete exchange of cations by means of their pH variation noted from 7 to 2.8. The resultant solution was dried in an open air at room temperature. The modified product was ground well with marttar until the uniform sized powder was obtained. This modified product of the protonated MMT was utilized to prepare …show more content…
The ion exchange capacity is measured by the chemical titration [Hasimi A, Stavropoulou A, Papadokostaki KG, Sanopoulou M. Euro Polym J (2008) 4098-107]. In order to measure the IEC values, the dry samples were soaked in 1M aqueous NaCl solution at room temperature for 24 hours to exchange of proton by sodium ions. The ion-exchanged NaCl solution was back titrated with 0.1M NaOH solution using phenolphthalein as an indicator. The protonic conductivity measurements were made through via Nyquist plot using N4L PSM 1735 series LCZ meter with amplitude of 10 mV from 1 Hz to 1 MHz The proton conductivity values are calculated
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