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Article Dans Une Revue Journal of Applied Polymer Science Année : 2015

Dielectric features of two grades of bi-oriented isotactic polypropylene

Résumé

The dielectric properties of two grades of bi-oriented isotactic polypropylene were studied with a variety of techniques:breakdown field measurements, dielectric spectroscopy, thermally stimulated depolarization currents (Is), and direct-current (dc) conductionI values. Standard polypropylene (STPP) and high-crystallinity polypropylene (HCPP) films were investigated. Measurementswere carried out over a wide temperature range (2150C/1125C). The breakdown fields in both materials showed a very small difference.On the other hand, the dielectric losses and dc conduction I values were significantly lower in HCPP. Both materials showeda decrease in the dielectric loss versus temperature in the range 20–90C; this is favorable for application in alternating-current powercapacitors. The analysis of the dc I value allowed us to find evidence of two main conduction mechanisms: (1) below 80C in bothmaterials, a hopping mechanism due to the motion of electrons occurred in the amorphous phase, and (2) above 80C, ionic conductionoccurred in HCPP, and hopping conduction occurred in STPP.

Dates et versions

hal-01197199 , version 1 (11-09-2015)

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Abdelkader Kahouli, Olivier Gallot-Lavallée, Pascal Rain, Olivier Lesaint, Christophe Guillermin, et al.. Dielectric features of two grades of bi-oriented isotactic polypropylene. Journal of Applied Polymer Science, 2015, DOI: 10.1002/app.42224. ⟨10.1002/app.42224⟩. ⟨hal-01197199⟩
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