| dc.description.abstract | In this study, two new series of amphoteric ion-exchange membranes were developed for electrolytic water splitting. In addition, another two new series of solid polymeric electrolytes were developed for lithium-ion batteries. Ring-opening metathesis polymerization (ROMP) is used to prepare a series of hydrophilic amphoteric ion exchange membranes and solid polymer is electrolytes with polynorbornene backbone.
The first series is the development of the PNB-NImS-3-based amphoteric ion-exchange membrane. This membrane is aimed to improved the previous PNB-CImS series. The C2 position of imidazole is expected to react with the cross-linking reagent of the Industrial Technology Research Institute. We have successfully synthesized PNB- NImS-3 with different hydrophilic ratios of 50%, 60%, and 70%. Membrane prepared with 60% hydrophilic ratio ionic polymer, PNB-NImS-3, exhibited 6.8% membrane swelling ratio and 9.5% water uptake. Membrane prepared with 50% hydrophilic ratio ionic polymer, PNB-NImS-3, exhibited 0.0625 Scm-1 proton ion conductivity.
The second series is the development of the PNB-NImS-6-based amphoteric ion-exchange membrane, which increases the length of the carbon chain of the hydrophilic monomer NB-NImBr-6 to improve polymer solubility. We have successfully synthesized PNB- NImS-6 with different hydrophilic ratios of 50% and 60%. Among them, PNB-NImS-6-50 exhibited better mechanical stability, chemical stability, and solubility than PNB-NImS-3-50. Membrane prepared by PNB-NImS-6-50 exhibited 7.6% membrane swelling ratio and 8.3% water uptake, and high proton ion conductivity of 0.0413 Scm-1.
The third series is the development of the solid polymeric electrolyte PNB-DiLi. We have successfully synthesized PNB-DiLi with different hydrophilic ratios of 30%, 40%, and 50%. Among them, PNB-DiLi-30 exhibited a rough estimated ionic conductivity of 8.49*10-5 Scm-1. Since PNB-DiLi series membranes have poor mechanical properties and solubility, low reproducibility of the deposition, we move forward to develop the fourth series.
The fourth series is the development of the solid polymeric electrolytes PNBO-DiLi and aPNBO-DiLi, which increase the length of the carbon chain of the hydrophobic monomer NBO-b8 to improve membrane solubility. We have successfully synthesized PNBO-DiLi with different hydrophilic ratios of 30%, 40%, and 50%. PNBO-DiLi series were tried to form a film, for the membrane properties examination. However, during the polymerization of PNBO-DiLi, monitored by 1H-NMR spectrum it was found that polymerization of this series is a non-chemical copolymer. Therefore, the solid polymeric electrolyte of aPNBO-DiLi is obtained by the secondary polymerization of PNBO-DiLi and AIBN. We have successfully synthesized aPNBO-DiLi with different hydrophilic ratios of 30%, 40%, and 50%. Film preparation of these new series of polymer is undergoing. | en_US |