NMR (Sodium Nuclear Magnetic Resonance), DSC (Differential Scanning Calorimetry), TMA, and High Pressure Electrical Conductivity Studies in PPO Complexed with Sodium Perchlorate

摘要

Audio frequency electrical conductivity, Differential Scanning Calorimetry(DSC) and Sodium Nuclear Magnetic Resonance (NMR) measurements have been carried out on Parel 58 elastomer complexed with sodium perchlorate. (As Parel 58 is primarily poly(propylene oxide), it will be referred to as PPO. The DSC and DMA measurements yield similar values for T sub G which are about 72 C higher than the 'central' T sub G for uncomplexed PPO. In addition, the DSC studies show that the sodium perchlorate is insoluble above about 140 C. The conductivity measurements have been carried out in vacuum over the temperature range 290-380K and at pressures up to 0.65 GPa from 315-370K. From a Voltage Transfer Function analysis E sub A is found to be about 0.09 electron volts and T sub O is found to be about 45 C below the 'central' glass transition temperature whichis the same behavior observed previously for PPO complexed with lithium salts and for the a relaxation in uncomplexed material. In addition, it is found that the vacuum activation volumes for the electrical conductivity and the a relaxation in uncomplexed material. In addition, it is found that the vacuum activation volumes for the electrical conductivity and the a relaxation are approximately the same when compared relative to T sub zero.