In an attempt to prepare a polymeric solid electrolyte with both high ionic conductivity at ambient temperature and adequate mechanical strength, an ionic conducting IPN composed of bisphenol A epoxy resin/polyethylen...In an attempt to prepare a polymeric solid electrolyte with both high ionic conductivity at ambient temperature and adequate mechanical strength, an ionic conducting IPN composed of bisphenol A epoxy resin/polyethylene glycol containing LiClO_4 was synthesized. The dependence of conductivity was investigated as a function of salt content, composition and temperature. It has been revealed that a maximum of conductivity appeared when EO/Li=25, where EO denotes the—(CH_2CH_2O)-unit in polyethylene glycol, and that the temperature dependence of conductivity followed VTF equation, suggesting that the motion of ionic carriers resulted from the segmental motion of the polymer. When glycerol epoxy resin was used instead of bisphenol A epoxy, the ambient temperature (25℃) conductivity could somewhat further be raised up to 3×10^(-5) S/cm.展开更多
The effect of gamma-radlatlon on plain crystalline polymers and crystalline polymers containing different amounts of difunctional monomer both in vacuum and in air at room temperature has been investigated with DSC. I...The effect of gamma-radlatlon on plain crystalline polymers and crystalline polymers containing different amounts of difunctional monomer both in vacuum and in air at room temperature has been investigated with DSC. It was found that the crystallization temperature T<sub>c</sub> of crosslinked sample measured on DSC at a constant cooling rate decreases with increasing radiation dose. The difference between T<sub>c</sub> before and after crosslinking (T<sub>c<sub>0</sub></sub>-T<sub>c<sub>R</sub></sub>) is linearly related to the radiation dose for plain polymer. Based on the Charlesby-Pinner equation, an expression has been derived:where S is the sol fraction, A and B are constants. Since there is evidence that T<sub>c</sub> is relative to S or crosslinking desity only and independent of the radiation crosslinking, the equation is also applicable to the enhanced gamma-radiation crosslinking of the polymer and can be used to evaluate the instantaneous G（c.1.）<sub>R</sub> value of nonrandom crosslinking system. Therefore, determination of T<sub>c</sub> with DSC offers a convenient展开更多
基金The Project supported by National Natural Science Foundation of China.
文摘In an attempt to prepare a polymeric solid electrolyte with both high ionic conductivity at ambient temperature and adequate mechanical strength, an ionic conducting IPN composed of bisphenol A epoxy resin/polyethylene glycol containing LiClO_4 was synthesized. The dependence of conductivity was investigated as a function of salt content, composition and temperature. It has been revealed that a maximum of conductivity appeared when EO/Li=25, where EO denotes the—(CH_2CH_2O)-unit in polyethylene glycol, and that the temperature dependence of conductivity followed VTF equation, suggesting that the motion of ionic carriers resulted from the segmental motion of the polymer. When glycerol epoxy resin was used instead of bisphenol A epoxy, the ambient temperature (25℃) conductivity could somewhat further be raised up to 3×10^(-5) S/cm.
基金Project supported by the National Natural Science Foundation of China.
文摘The effect of gamma-radlatlon on plain crystalline polymers and crystalline polymers containing different amounts of difunctional monomer both in vacuum and in air at room temperature has been investigated with DSC. It was found that the crystallization temperature T<sub>c</sub> of crosslinked sample measured on DSC at a constant cooling rate decreases with increasing radiation dose. The difference between T<sub>c</sub> before and after crosslinking (T<sub>c<sub>0</sub></sub>-T<sub>c<sub>R</sub></sub>) is linearly related to the radiation dose for plain polymer. Based on the Charlesby-Pinner equation, an expression has been derived:where S is the sol fraction, A and B are constants. Since there is evidence that T<sub>c</sub> is relative to S or crosslinking desity only and independent of the radiation crosslinking, the equation is also applicable to the enhanced gamma-radiation crosslinking of the polymer and can be used to evaluate the instantaneous G（c.1.）<sub>R</sub> value of nonrandom crosslinking system. Therefore, determination of T<sub>c</sub> with DSC offers a convenient
