| Summary: | 碩士 === 國立臺北科技大學 === 化學工程研究所 === 100 === The branched polymer derived from poly(ethylene glycol) diglycidyl ether (PEGDE), poly(oxyethylene) diamine(PEDA) and glycidyl,2,2,3,3,4,4,5,5-octafluoropentyl ether as monomer. Polyelectrolytes were prepared by doping the branched polymer with different ratio lithium perchlorate.Using GPC, DSC, TGA, FT-IR and NMR to analyze the characteristics of polyelectrolyte and furthermore we used plate and plate rheometer to analyze the effect of amount of lithium salt on polyelectrolytes. We could get average molecular weight (Mw) was 6900, the distribution index (PDI) was 1.4, and by titration method to calculate the conversion(%) was 93%. It was found that the glass transition temperature of branched polyelectrolytes were about from -59.6 through -36.8oC, which dependent on the amount of lithium salts. And the maximum decomposition temperature was drop from 393 to 287oC. We used Ozawa method to study activation energy of decomposition (Ea) of polyelectrolytes and find activation energy of decomposition will decreased with the amount of lithium was increasing.The best ionic conductivity was 5.3-4S/cm when O/Li=15 at 70oC.And to compare the result with the branched poly(ethylene oxide)-lithium electrolytes(BP6).
The zero shear viscosity(η0) of branched polyelectrolytes was increased with the raise of the lithium salt molar ratio ε, but the zero shear viscosity(η0) was decreased with temperature increasing. Therefore, we proposed experience equation that showing the correlation of viscosity and ε, This mode could fully explain the variation of actual value.
The fluoride branched polymer and it’s lithium polyelectrolyte was showed shear thinning behavior of non-Newtonian fluids at high frequency and shear rate . The relationship between shear rate and shear viscosity of polyelectrolyte could be obtained by Carreau-Yasuda equation. Futhermore, the branched polyelectrolyte’s storage modulus(G'') and loss modulus(G") were affected by the lithium salt. According to this result, we found the following equation to explain the relationship between the lithium salt molar ratio and two modulus at 40℃ and frequency at 10 Hz .
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