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FTIR studies of PEMA/PVdF-HFP blend polymer electrolyte system incorporated with LiCF3SO3 salt

Poly(ethyl methacrylate), PEMA and poly(vinylidenefluoride-co-hexafluoropropylene). PVdF-HFP have been chosen as hosts for the development of a polymer blend electrolyte system. Lithium trifluoromethanesulfonate (triflate), LiCF3SO3 is the lithium ion, Li+ provider. The ratio of PEMA:PVdF-HFP in the...

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Main Authors: Sim, L.N., Majid, Siti Rohana, Arof, Abdul Kariem
Format: Article
Published: Elsevier 2012
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QC Physics
Online Access:http://eprints.um.edu.my/7701/
https://doi.org/10.1016/j.vibspec.2011.11.005
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spelling my.um.eprints.77012019-08-27T01:14:26Z http://eprints.um.edu.my/7701/ FTIR studies of PEMA/PVdF-HFP blend polymer electrolyte system incorporated with LiCF3SO3 salt Sim, L.N. Majid, Siti Rohana Arof, Abdul Kariem QC Physics Poly(ethyl methacrylate), PEMA and poly(vinylidenefluoride-co-hexafluoropropylene). PVdF-HFP have been chosen as hosts for the development of a polymer blend electrolyte system. Lithium trifluoromethanesulfonate (triflate), LiCF3SO3 is the lithium ion, Li+ provider. The ratio of PEMA:PVdF-HFP in the blend is fixed at 70:30 in order to obtain transparent films with good mechanical stability. The polymers and LiCF3SO3 salt have been refluxed for 2 h at temperatures between 55 and 65 degrees C. The concentration of LiCF3SO3 salt has been varied from 0 to 40 wt.%. Fourier transform infrared (FTIR) spectroscopy has shown that blending between PEMA and PVdF-HFP has occurred from the changes in the CH2 scissoring[delta(CH2)], asymmetrical O-C2H5 bending [gamma(OC2H5)], CH2 twisting [ tau(CH2)]. C-O stretching of -COO-group [upsilon(CO)], asymmetrical C-O-C stretching [upsilon(a)(COC)] and C-O stretching of -OC2H5 [upsilon(C-O)] from PEMA as well as the symmetrical CF2 stretching [upsilon(5)(CF2)], alpha-phase and the amorphous region of PVdF-HFP. Complexation occurs via the coordination of Li+ ions with the oxygen atom in the carbonyl (C=O) and ester (-COC-) groups of PEMA as well as with the fluorine atom in -CF2 and -CF3 groups in PVdF-HFP. Curve fitting of spectral bands in the symmetrical upsilon(5)(SO3) stretching region in the polymer blend-salt complexes has shown that free ions (1031-1032 cm(-1)) and ion pairs (1040-1042 cm(-1)) are present in samples incorporated with 10 wt.% LiCF3SO3 and above, while ion aggregates at 1049 cm(-1) are formed when 40 wt.% LiCF3SO3 is added into the polymer blend. The increase in the ionic conductivity at high salt contents could be explained by the greater amount of free ions as compared to ion pairs and ion aggregates. (C) 2011 Elsevier B.V. All rights reserved. Elsevier 2012 Article PeerReviewed Sim, L.N. and Majid, Siti Rohana and Arof, Abdul Kariem (2012) FTIR studies of PEMA/PVdF-HFP blend polymer electrolyte system incorporated with LiCF3SO3 salt. Vibrational Spectroscopy, 58. pp. 57-66. ISSN 0924-2031 https://doi.org/10.1016/j.vibspec.2011.11.005 doi:10.1016/j.vibspec.2011.11.005
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic QC Physics
spellingShingle QC Physics
Sim, L.N.
Majid, Siti Rohana
Arof, Abdul Kariem
FTIR studies of PEMA/PVdF-HFP blend polymer electrolyte system incorporated with LiCF3SO3 salt
description Poly(ethyl methacrylate), PEMA and poly(vinylidenefluoride-co-hexafluoropropylene). PVdF-HFP have been chosen as hosts for the development of a polymer blend electrolyte system. Lithium trifluoromethanesulfonate (triflate), LiCF3SO3 is the lithium ion, Li+ provider. The ratio of PEMA:PVdF-HFP in the blend is fixed at 70:30 in order to obtain transparent films with good mechanical stability. The polymers and LiCF3SO3 salt have been refluxed for 2 h at temperatures between 55 and 65 degrees C. The concentration of LiCF3SO3 salt has been varied from 0 to 40 wt.%. Fourier transform infrared (FTIR) spectroscopy has shown that blending between PEMA and PVdF-HFP has occurred from the changes in the CH2 scissoring[delta(CH2)], asymmetrical O-C2H5 bending [gamma(OC2H5)], CH2 twisting [ tau(CH2)]. C-O stretching of -COO-group [upsilon(CO)], asymmetrical C-O-C stretching [upsilon(a)(COC)] and C-O stretching of -OC2H5 [upsilon(C-O)] from PEMA as well as the symmetrical CF2 stretching [upsilon(5)(CF2)], alpha-phase and the amorphous region of PVdF-HFP. Complexation occurs via the coordination of Li+ ions with the oxygen atom in the carbonyl (C=O) and ester (-COC-) groups of PEMA as well as with the fluorine atom in -CF2 and -CF3 groups in PVdF-HFP. Curve fitting of spectral bands in the symmetrical upsilon(5)(SO3) stretching region in the polymer blend-salt complexes has shown that free ions (1031-1032 cm(-1)) and ion pairs (1040-1042 cm(-1)) are present in samples incorporated with 10 wt.% LiCF3SO3 and above, while ion aggregates at 1049 cm(-1) are formed when 40 wt.% LiCF3SO3 is added into the polymer blend. The increase in the ionic conductivity at high salt contents could be explained by the greater amount of free ions as compared to ion pairs and ion aggregates. (C) 2011 Elsevier B.V. All rights reserved.
format Article
author Sim, L.N.
Majid, Siti Rohana
Arof, Abdul Kariem
author_facet Sim, L.N.
Majid, Siti Rohana
Arof, Abdul Kariem
author_sort Sim, L.N.
title FTIR studies of PEMA/PVdF-HFP blend polymer electrolyte system incorporated with LiCF3SO3 salt
title_short FTIR studies of PEMA/PVdF-HFP blend polymer electrolyte system incorporated with LiCF3SO3 salt
title_full FTIR studies of PEMA/PVdF-HFP blend polymer electrolyte system incorporated with LiCF3SO3 salt
title_fullStr FTIR studies of PEMA/PVdF-HFP blend polymer electrolyte system incorporated with LiCF3SO3 salt
title_full_unstemmed FTIR studies of PEMA/PVdF-HFP blend polymer electrolyte system incorporated with LiCF3SO3 salt
title_sort ftir studies of pema/pvdf-hfp blend polymer electrolyte system incorporated with licf3so3 salt
publisher Elsevier
publishDate 2012
url http://eprints.um.edu.my/7701/
https://doi.org/10.1016/j.vibspec.2011.11.005
_version_ 1643688105786474496
score 13.211869

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