Search results for "PEEK"
showing 5 items of 25 documents
Sulfonētu poli(ēter ēter ketona)/kompozītu membrānu ar mainīgu sulfonēšanas pakāpikopā ar cirkonija oksīda nanodaļiņu un [MMMIM][Me2PO4] jonu šķīduma…
2017
Sulfonētu poli(ēter ēter ketona)/kompozītu membrānu ar mainīgu sulfonēšanas pakāpi kopā ar cirkonija oksīda nanodaļiņu un [MMMIM][Me2PO4] jonu šķīduma piedevām termiskās īpašības. Novikovs A., zinātniskais vadītājs asociētais profesors Dr. ķīm., Vaivars G., Bakalaura darbs, 51 lappuses, 66 attēli, 6 tabulas, 27 literatūras avoti. Latviešu valodā. Šaja rakstā tiek apskatīta kompozītu membrānu ar mainīgu sulfonēšanas pakāpi kopā ar cirkonija oksīda nanodaļiņu un [MMMIM][Me2PO4] jonu šķīduma piedevām termiskās īpašības. Membrānas tika raksturotas ar termogravimetriskas analīzes un skenejošas elektonmikroskopijas palīdzību. DEGŠŪNAS, SPEEK, TGA, PUSCAURLAIDĪGAS MEMBRĀNAS, ZIRKONIJA OKSIDS.
Polimēra membrānu īpašību optimizācija, izmantojot jonu šķidrumus
2016
Polimēru membrānu īpašību optimizācija, izmantojot jonu šķidrumus. Āboltiņa E., zinātniskais vadītājs Dr.ķīm. Vaivars G., zinātniskais konsultants Dr.h.ķīm., prof. Zicmanis A. Maģistra darbs, 65 lappuses, 18 attēli, 11 tabulas, 38 literatūras avoti, 4 pielikumi. Latviešu valodā. Maģistra darba literatūras apskatā ir apkopota galvenā informācija par polimēra membrānām, degšūnām un jonu šķidrumiem – to raksturošanu un izmantošanu, plašāk par JŠ izmantošanu kā kompozītu polimēra membrānās. Laboratorijā tika veikta piecpadsmit jonu šķidrumu – septiņu dimetilfosfātu, septiņu hlorīdu un metilkarbonāta sintēze. Iegūto savienojumu struktūras tika pierādītas, izmantojot 1H KMR un IS spektroskopijas …
Progress in polymeric material for hydrogen storage application in middle conditions
2014
Hydrogen sorption using a manganese oxide anchored to PEEK (Poly(ether-ether-keton)) matrix was studied. The functionalization process and the obtained results on hydrogen storage capability of the synthesized polymer are reported. The functionalised polymer was characterised by Scanning Electron Microscopy, Transmission Electron Microscopy, X-ray diffraction and Volumetric Hydrogen sorption measurements. Different synthesis conditions in terms of precursor concentration and reaction time were used and the direct correlation between manganese oxide percentage and hydrogen storage capability was confirmed. In this way different powders were synthesised. It is assumed that the sample with 78 …
Different approaches in sulfonated poly (ether ether ketone) conductivity measurements
2019
Ion conductivity of sulfonated poly (ether ether ketone) (SPEEK) membranes with various degree of sulfonation (DS) was investigated using impedance analysis with different measuring cell configuration and ion conductivity was calculated from resistances of polymer membranes. SPEEK was synthesized from poly (ether ether ketone) (PEEK) via sulfonation reaction in concentrated sulfuric acid (95-98%). Scanning electron microscopy (SEM) analysis of membrane surface was performed to determine possible mechanical damage to the membrane during resistance measurements.
Proton Conducting Membrane Prepared by Cross-Linking Highly Sulfonated Peek for PEMFC Application
2009
The proton conducting membrane was prepared by cross-linking highly sulfonated and sulfinated poly(etheretherketone) (SsPEEK). The cross-linked membrane is low cost due to its use of non-expensive chemical and simple production procedure. The membrane exhibited high proton conductivity (0.04 S/cm at 60 °C), extremely reduced water uptake, enhanced strength and stability compared with that of non-cross-linked membrane. These results suggested that the cross-linked PEEK membrane is a suitable candidate of proton conducting membranes for polymer electrolyte membrane fuel cell (PEMFC) applications, particularly promising to be used in direct methanol fuel cell (DMFC) due to its lower methanol c…