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3 Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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The effect of interfacial interaction of components on radio-absorbing properties of polymer composites.

Goldade V., Pinchuk L., Skliar A., Bannyi V.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

2007

Vol. 46, nr 19

21-25

Radio-physical properties of polymer composite radio-absorbing materials (RAM) filled by metals and ferrites are studied in the work. The effect of interactions of the polymer binder and filler at the interfaces upon absorption of super high frequency (SHF) radiation energy has been estimated. It was found out that the intensity of these interactions could be monitored by altering temperature regimes during formation of the polymer composite

On the mechanism of charge storage in melt-blown fibrous polymer materiale.

Goldade V., Pinchuk l., Zotov S., Kravtsov A., Rychkov A.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

2007

Vol. 46, nr 19

185-190

The mechanisms of electrization and charge storage of polymer fibers (PE and PP) produced by the melt blowing technology have been studied. A physical model is proposed of the fibrous structure formation. The model is based on representations of electrostatic attraction of fibers carrying a process (technological) charge. It is possible to impart unlike charges during melt blowing to different parts of the fibers found in the viscous flow state. Interaction of unlike charges leads to two main types of fiber bonding. The first type is formed when the fibers get fused at intersection and form thereby so-called nodes. The nodes are mechanically balanced structures that undergo destruction during polymer melting, i.e. at T> Tm. The other type of joints appears when the contact is formed without melting of unlikely charged parts of the fibers. These bonds break at T< Tn] under the action of stresses in the fibrous samples at heating. Using a mini-electrode, differences in the spectra of thermally stimulated currents (TSC) have been recorded during charge relaxation in various zones of fiber contacts. As a result of forced electrization of the fibers in the field of the negative corona discharge, an efficient surface charge density has been reached in the polymer fibrous materials, equal to 20 nC/cm2. Structural traps in the oxidized surface layer of the fibers were found to be filled by the charge carriers due to the injective and dipolar-oriented mechanisms of polarization. Fiber modification by phosphorus trichloride PC13 elevates stability of the electret charge in the fibrous materials and results in a shift of the main relaxation TSC peak into the region of high temperatures. This fact confirms that high-energy traps have been formed, from which the charge is liberated under the temperature above the polymer melting point Tuv.

Electret properties peculiar to fibrous polymer materials

Kravtsov A., Goldade V., Zotov S.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

2004

Vol. 40, nr 15

9-15

Some peculiar electret properties of fibrous polymer materials have been studied by complementary methods. The residual polarization has been proved to result from capture of free charge carriers on two main types of defects, namely oxygen-containing groups and the defects formed from violated permolecular structure. A spontaneous electrel charge is generated in the fibrous material at both melt blowing and melt spinning and its value depends on the process parameters. The forced polarization of fibers in an external electric field makes the electret effect more pronounced and adds a specific character to the polarizing charge relaxation.