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Title:	Preparation, characterization and structural optimization of [poly(methyl methacrylate) grafted natural rubber-lithium perchlorate]:[titania-silica] polymer electrolytes
Authors:	Kang Oon Lee (P67325)
Supervisor:	Nur Hasyareeda Hassan, Dr.
Keywords:	Polyelectrolytes Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia
Issue Date:	27-Sep-2018
Description:	[Poly(methyl methacrylate) grafted natural rubber-lithium perchlorate]:[Titania-Silica] polymer electrolytes were developed in stepwise manner through three sequential stages, that is TiO2-SiO2 nanoparticles preparation, [MG49]:[TiO2-SiO2] polymer films fabrication and [MG49-LiClO4]:[TiO2-SiO2] polymer electrolytes fabrication. In the first step, TiO2-SiO2 nanoparticles were obtained through sol-gel method in different catalytic systems, such as acid-tetrahydrofuran catalytic systems and also acid-ethanol catalytic systems. TiO2-SiO2 nanoparticles were obtained in systematic manner through proper control reaction conditions, such as composition ratio (Ti/Si molar ratio = 100:0, 70:30, 50:50, 30:70 and 0:100) and also hydrolysis ratio (H2O/alkoxide molar ratio = 4, 8, 16 and 32). Dynamic light scattering data had revealed nanoscale particle size range at the moderate hydrolysis ratio (8 ≤ RH ≤ 16). Scanning electron microscope (SEM) data had illustrated identical structure dimension across different catalytic systems. X-ray diffraction (XRD) pattern had demonstrated partial phase transition above a certain hydrolysis ratio (RH ≥ 16). Broad hump had indicated predominant amorphous orientation across different catalytic systems. Fourier transform infrared (FTIR) spectra had confirmed Ti-O-Si bonds formation over the entire hydrolysis ratio. Distinct pattern had demonstrated inconsistent structural orientation across different catalytic systems. TiO2-SiO2 nanoparticles had achieved optimal feature at RH = 16, in particular in Ti/Si molar ratio = 70:30 and 30:70. In such a case, TiO2-SiO2 (70:30) and (30:70) nanoparticles were further incorporated into MG49 polymer matrices at different TiO2-SiO2 weight percentages (0.0, 2.0, 4.0, 6.0 and 8.0 wt.%). XRD and FTIR analysis had indicated significant crystalline phase reduction, but less prominent structural distortion at 8.0 wt.% TiO2-SiO2 insertion level. SEM data had revealed distinct dispersive behaviour upon different TiO2-SiO2 reinforcement effects. Thermal and rheological analysis had reflected substantial stabilities improvement upon different TiO2-SiO2 reinforcement effects. In comparison, TiO2-SiO2 (70:30) nanoparticles had provided better performance properties at 8.0 wt.% TiO2-SiO2 insertion level. In such a case, TiO2-SiO2 (70:30) nanoparticles were introduced into MG49-LiClO4 polymer electrolytes with different LiClO4 weight proportions (0.0, 5.0, 10.0, 15.0, 20.0, 25.0 and 30.0 wt.%). XRD and FTIR analysis had revealed dramatis crystalline phase reduction and structural distortion over the entire concentration range. More important, electrochemical impedance spectroscopy (EIS) analysis had demonstrated maximum ionic conductivities at 25.0 wt.% LiClO4 insertion level. Cyclic voltammetry analysis (CV) had revealed ideal capacitive properties at 25.0 wt.% LiClO4 insertion level. SEM data had disclosed distinct morphological evolution upon different TiO2-SiO2 reinforcement effects. Thermal and rheological analysis had reflected operational stabilities improvement upon different TiO2-SiO2 reinforcement effects. In short, [MG49-LiClO4]:[TiO2-SiO2] polymer electrolytes have attained better performace properties upon 8.0 wt.% TiO2-SiO2 reinforcement effects. Resultant polymer electrolytes have achieved 10-4 S/cm at high temperature (100 C); without impaired dimensional stability. Resultant polymer electrolytes have potential application in high power devices.,'Certification of Master's/Doctoral Thesis' is not available,Ph.D.
Pages:	179
Call Number:	QD382.P64K336 2018 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Science and Technology / Fakulti Sains dan Teknologi

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