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Characterization of polymer-type ionic conductors using nuclear magnetic resonance and thermal analysis. Humidity sensor; Caracterizacao de condutores ionicos de tipo polimerico por ressonancia magnetica nuclear (RMN) e analises termicas. Sensor de umidade

Miscellaneous:

Abstract

We report a study using Nuclear Magnetic Resonance (NMR), Thermogravimetry Analysis, Differential Scanning Calorimetry and Infrared Spectroscopy in polymeric complexes formed poly(ethylene oxide), (PEO), and lithium salts. These complexes have have shown a large potential for technological applications in batteries, sensors, etc. We developed and characterized humidity sensors and discussed how the humidity affects the conformation of the complexes, the mobility of ionic species, and the polymeric chains. The results indicate that the hydration affects the conformation of polymeric complexes by plasticizing the water, which induces a volumetric expansion in the PEO chain. The processes was completely reversible for the level of hydration studied. NMR was used to distinguish the movement of polymeric chains from the movement of the ionic species. From the analysis of the second moment of resonance lines from the study of the nuclear relaxation we were able to estimate the average distance between the ionic species and the proton in the complexes chains. The behaviour of spin -lattice relaxation of hydrogen and fluorine in the P(EO) - Li B F, as a function of temperature and frequency reflects the nature of the disorder and the complexity of the ionic conduction process in these materials. (author). 91  More>>
Publication Date:
Apr 01, 1992
Product Type:
Miscellaneous
Reference Number:
SCA: 665100; 250903; PA: AIX-27:049926; EDB-96:102601; SN: 96001612816
Resource Relation:
Other Information: TH: Tese (Ph.D.).; PBD: Apr 1992
Subject:
66 PHYSICS; 25 ENERGY STORAGE; IONIC CONDUCTIVITY; POLYMERS; STRUCTURAL CHEMICAL ANALYSIS; NUCLEAR MAGNETIC RESONANCE; THERMAL ANALYSIS; CALORIMETRY; LITHIUM COMPOUNDS; POLYETHYLENES; SPIN-LATTICE RELAXATION; TEMPERATURE MEASUREMENT; THERMAL GRAVIMETRIC ANALYSIS
OSTI ID:
247397
Research Organizations:
Sao Paulo Univ., Sao Carlos, SP (Brazil). Inst. de Fisica e Quimica
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
TRN: BR9635000049926
Availability:
Available from the Nuclear Information Center of Brazilian Nuclear Energy Commission, Rio de Janeiro
Submitting Site:
BRN
Size:
179 p.
Announcement Date:

Miscellaneous:

Citation Formats

Cavalcante, Maria Goretti. Characterization of polymer-type ionic conductors using nuclear magnetic resonance and thermal analysis. Humidity sensor; Caracterizacao de condutores ionicos de tipo polimerico por ressonancia magnetica nuclear (RMN) e analises termicas. Sensor de umidade. Brazil: N. p., 1992. Web.
Cavalcante, Maria Goretti. Characterization of polymer-type ionic conductors using nuclear magnetic resonance and thermal analysis. Humidity sensor; Caracterizacao de condutores ionicos de tipo polimerico por ressonancia magnetica nuclear (RMN) e analises termicas. Sensor de umidade. Brazil.
Cavalcante, Maria Goretti. 1992. "Characterization of polymer-type ionic conductors using nuclear magnetic resonance and thermal analysis. Humidity sensor; Caracterizacao de condutores ionicos de tipo polimerico por ressonancia magnetica nuclear (RMN) e analises termicas. Sensor de umidade." Brazil.
@misc{etde_247397,
title = {Characterization of polymer-type ionic conductors using nuclear magnetic resonance and thermal analysis. Humidity sensor; Caracterizacao de condutores ionicos de tipo polimerico por ressonancia magnetica nuclear (RMN) e analises termicas. Sensor de umidade}
author = {Cavalcante, Maria Goretti}
abstractNote = {We report a study using Nuclear Magnetic Resonance (NMR), Thermogravimetry Analysis, Differential Scanning Calorimetry and Infrared Spectroscopy in polymeric complexes formed poly(ethylene oxide), (PEO), and lithium salts. These complexes have have shown a large potential for technological applications in batteries, sensors, etc. We developed and characterized humidity sensors and discussed how the humidity affects the conformation of the complexes, the mobility of ionic species, and the polymeric chains. The results indicate that the hydration affects the conformation of polymeric complexes by plasticizing the water, which induces a volumetric expansion in the PEO chain. The processes was completely reversible for the level of hydration studied. NMR was used to distinguish the movement of polymeric chains from the movement of the ionic species. From the analysis of the second moment of resonance lines from the study of the nuclear relaxation we were able to estimate the average distance between the ionic species and the proton in the complexes chains. The behaviour of spin -lattice relaxation of hydrogen and fluorine in the P(EO) - Li B F, as a function of temperature and frequency reflects the nature of the disorder and the complexity of the ionic conduction process in these materials. (author). 91 refs., 69 figs., 2 tabs.}
place = {Brazil}
year = {1992}
month = {Apr}
}