Dielectric properties of lignocellulosic materials-polypropylene composites

• Autorzy: Markiewicz E. , Paukszta D. , Borysiak S.
• Języki publikacji: EN

Abstrakty

EN

Composites were made from isotactic polypropylene and lignocellulosic materials derived from hemp and flax plants using moulding and hydraulic pressing techniques. Frequency dependences of the electric permittivity E and the ac conductivity .delta ac of the composite samples were measured in the frequency range from 100 Hz to 13 MHz at room temperature. The linear relationship between the reciprocal relative permittivity (1/E') and the volume fraction of the lignocellulosic material was established. The loading of the polypropylene with the lignocellulosic materials increases the electric permittivity E' and improves the electrical conductivity .delta ac. The effect of temperature (150-450 K) on the dielectric spectrum of polypropylene and the composites was investigated in the frequency range from 100 Hz to 1 MHz. Four dielectric relaxation processes were found in the spectra of the composites: ß - ascribed to the local motion of the main polymer chain, ßwet - associated with the presence of water, .delta - related to the motion of the end groups in the branched polymers and .delta - due to the conductivity effect. The dielectric spectrum of polypropylene does not exhibit anomalies.

Słowa kluczowe

EN

polymer matrix composites; lignocellulosic material; electrical properties

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2009
• Tom: Vol. 27, No. 2
• Strony: 581--594
• Opis fizyczny: Bibliogr. 36 poz.

Twórcy

autor

Markiewicz E.

autor

Paukszta D.

autor

Borysiak S.

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

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