Nuclear magnetic resonance study of physical properties of new polymer electrolytes and phospate glasses

Author(s)

Caio Eduardo de Campos Tambelli

• Document type: Doctoral Thesis
• Press: São Carlos.
• Institution: Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT)
• Defense date: 2003-05-29

Examining board members

Jose Pedro Donoso Gonzalez; Gaston Eduardo Barberis; Tito Jose Bonagamba; Jose Fabian Schneider; Edgar Dutra Zanotto

• Advisor: Jose Pedro Donoso Gonzalez

Abstract

In this work we report the study of new polymer electrolytes and phosphate glasses using Nuclear Magnetic Resonance (NMR) technique. The polymer electrolytes studied were polyester (glycol ethylene / citric acid) and films formed by hydroxyethylcelluloses (HEC), poly(ethy1ene oxide) and poly(propy1ene oxide) diisocyanates, both with lithium salt. To study the mobility of polymer chains and lithium ions in the polymer electrolytes, measurements of the temperature and viscosity dependence of 1H e do 7Li lineshape and spin-lattice relaxation rate were realized. The correlation times obtained from relaxation data, show that the mobility of polymer chains and lithium ions are comparable to those found in other similar polymer electrolytes. The degree of polymerization of the phosphate chain was studied in phosphate glass In(PO3)3 and in the binary system(1-x)In(PO3)3 - xBaF2. The 31P MAS NMR for different melting times, indicate that the water reduces the chain length by hydrolyzing P-O-P bonds to produce two separated chains, terminated by -P-OH groups. The addition of BaF2 in the phosphate glass, reduces the phosphate chain length by forming non-bridging oxygen ions. High concentration of BaF2 causes depolymerization of the phosphate chain to create pyrophosphate groups (Q1) and orthophosphate groups (Q0). (AU)