Abstract

The heat resisting property of charge storage resins is required. It is well known that the charge storage of a polymer is influenced by the charge carrier traps. Charge trap parameters and charging property of porous and solid polypropylene (PP) films were studied using thermally stimulated current (TSC). We proposed already the Asymptotic Estimation Method (AEM) to evaluate trap parameters such as the energy depth of the trap E t and the escape frequency factor ν from TSC spectrum caused by multiple carrier traps, separately. To describe the ν- E t correlation, the trap sites caused by the porous structure were evaluated in the range of 1.0–1.1 eV. In addition, the ν values for those trap sites were found to be in the range 1011–1012 S−1. A comparison of surface potential decay revealed that drawing treatment caused discharge property by heating and the porous structure in the PP film induced charge storage stability.

Highlights

  • The polymeric materials are utilized in industry and an ordinary household with the characteristic that a natural organic material does not have

  • We developed the evaluation method using the characteristic of the thermally stimulated current (TSC) measurement

  • The temperature characteristic of the surface charge electric potential was examined directly by the thermally stimulated charge decay (TSCD) other than TSC measurement. It applied the AEM separation system which we proposed to the separation of the TSC spectrum and analyzed the property of the trap which imperforate polypropylene and porous polypropylene formed

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Summary

Introduction

The polymeric materials are utilized in industry and an ordinary household with the characteristic that a natural organic material does not have. Research and development are performed actively because the polymers are materials with a variety of functionality (Imai et al, 2002; Ishii et al, 2009; Ishimoto et al, 2009; Varlow & Li, 2002). By such a background, we aimed at the polymer system piezoelectric material which let it give piezoelectricity as the sensor function. The PVDF of the polymer system piezoelectric material immobilized CF2 dipolar orientation. Piezoelectric modulus d33 of the porous polymer electrets is higher than PVDF, and in a polymer system, polaristation reversal happens

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