| 摘要 |
<p>PURPOSE:To efficiently measure contact potential difference of a polymer powder within a short time by heat treating the powder at a temperature near the glass transition temperature of the polymer to remove the static charge, disposing the powder between vibration electrodes by cooling or without cooling after the removing the charge, and measuring the potential difference of the powder. CONSTITUTION:Before the measurement of contact potential difference of a polymer powder, the power is heat-treated at a temperature near its glass transition temperature of the powder (a heat treating time of 10-30min), thereby lowering the potential of the powder to zero or the vicinity of the zero within a short time, and hence a true contact potential difference of the powder can be obtained within a short time. A time required for measuring the difference is several minutes, and a time for a preparatory operation necessary for removing the static charge may also be about 30-40min. Further, since an operation for the removing static charge may be a simple sheet treatment, the measurement of a true contact potential difference of the powder can be efficiently executed within a short time.</p> |
