Dielectric Properties of Low Molecular Weight Polychlorotrifluoroethylene

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概要

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• Measurements of dielectric properties of six polychlorotrifluoroethylene samples with different molecular weights, between 500 and 1300, were made in the temperature range between -70° and+200℃ as a function of frequency (30 Hz-3 MHz). The temperature dependence of NMR line width was measured in the temperature range between -150゜ and +80℃. A dielectric absorption due to the dipole orientation in crystalline phase is observed in low molecular weight samples. The activation energy of the dielectric process is 35 Kcal/mole for sample #2 (M^^-:600) but diminishes to 17 Kcal/mole for #7 (M^^-:110,000). The magnitude of the absorption increases with increasing molecular weight. Loci of ε" vs ε' in these low molecular weight samples are fitted by the Davidson-Cole plot, but they approach the Cole-Cole plot with increasing molecular weight. The dielectric process is explained in terms of the dipole orientation of two modes: main chain dipole and end-group dipole. The effective dipole moment of a polar group unit in the chain, measured for a dilute solution, increases with increasing molecular weight.

• 社団法人応用物理学会の論文
• 1967-02-15

著者

• Hara Tohru

  Matsushita Research Institute Tokyo

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