本研究分別利用雙官能基單體:poly(ethylene glycol) diglycidyl ether (PEGDE)、含胺基之四官能基化合物polyoxyethyleneamines (D230、PEDA),和單官能基之化合物phenyl glycidyl ether (PGE)、butyl glycidyl ether (BGE)、dedecyl and tetradecyl glycidyl ether (AGE),經過聚合反應後產生分枝狀聚氧化乙烯高分子;再摻雜過氯酸鋰,製備出一系列分枝狀聚氧化乙烯鋰電解質。利用FT-IR及NMR鑑定其結構,DSC 及TGA分析其熱性質,偏光顯微鏡觀察其結晶性,並以交流阻抗分析法量測電解質之離子導電度。六種分枝高分子之重量分子量分布於4000~8500g/mol,其玻璃轉移溫度(Tg)則都低於室溫,依結構的不同介於-46~-17oC之間。含鋰鹽的電解質會破壞分枝高分子的結晶度,且玻璃轉移溫度(Tg)會隨鋰鹽濃度越多而上升。所測得之鋰電解質在70oC時的導電度範圍為8.2×10-6~5.3×10-4 S/cm;其中以PEDA-PEGDE-AGE分枝高分子電解質在O/Li比為15時的導電度最佳,溫度為20℃其離子導電度為2.10×10-5 S/cm,70oC時為5.31×10-4 S/cm。根據TGA所得到的結果,所有鋰電解質的百分之五熱重損失溫度大於250oC。
PEO-type branched polymers were synthesized via a stepwise bulk polymerization, and polymer electrolytes were further prepared by doping the branched polymers with lithium perchlorate. The lithium ionic conductivity of the polymer electrolytes of 2.1×10-5 S/cm at 20oC, and 5.31×10-4 S/cm at 70oC can be achieved by addition of Li+, under O/Li=15, into the branched polymers. It was found that the glass transition temperatures of the prepared branched polymer electrolytes is about from -46 through -17oC, which dependent on the chemical structure and the amount of lithium perchlorate. The decomposition temperature at 5% weight loss measured by a TGA is higher than 250oC, and it implies the PEO-type branched polymers have a good thermal stability.