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Title:	Preparation and characterization of poly (vinylidene fluoride-hexafluoro propylene) (PVDF-HFP)/poly (methyl methacrylate)-grafted natural rubber (MG49) blend based polymer electrolyte
Authors:	Narges Ataollahi (P59340)
Supervisor:	Azizan bin Ahmad, Professor Dr
Keywords:	Natural rubber Polymer electrolyte Polyelectrolytes
Issue Date:	5-Aug-2013
Description:	Polymer electrolyte based on the blend of poly (vinylidene fluoride-hexafluoro propylene) (PVDF-HFP) and Poly (methyl methacrylate)-grafted natural rubber (MG49) (70/30) were prepared successfully by solution casting technique. Lithium tetraflouroborate, lithium perchlorate and lithium trifluoromethane sulfonate were used as charge carriers contributors. Ethylene carbonate and propylene carbonate plasticizers were applied to improve ionic conductivity of the polymer electrolytes. The free standing films of polymer electrolyte were analyzed by electrochemical impedance spectroscopy, Fourier transform infrared, x-ray diffraction, thermogravimetric analysis and scanning electron microscopy. It was observed that lithium tetraflouroborate shows better performance in terms of conductivity among all the salts used. The highest room temperature conductivity was revealed at 2.8×10ˉ4 S cm-1 for the polymer electrolyte with 30 wt. % of the salt. Impedance results indicate that conductivity enhances as temperature increases but it does not obey Arrhenius rule. The coordination bond between Li ions with functional groups (C-F) in PVDF-HFP and oxygen atoms in carbonyl group (C =O) and ether group (C-O-C) of MG49 was confirmed by FTIR studies. The XRD result confirmed that crystallinity of electrolyte films reduced by introduction of salt and plasticizers hence the degree of amorphicity increases leading to enhancement of ionic conductivity. SEM micrograph confirmed the compatibility of PVDF-HFP/MG49 blend and upon addition of lithium salt homogeneous polymer electrolytes were formed. Moreover propylene carbonate plasticizer shows better compatibility with polymer complex. The highest ionic conductivity achieved at room temperature was 1.51 ×10 ˉ3 S cm-1 at 80 wt. % of the plasticizer.,Master/Sarjana
Pages:	116
Call Number:	QD382.P64.A863 2013
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Science and Technology / Fakulti Sains dan Teknologi

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