Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: polymer fibers

Sortuj według:

Ogranicz wyniki do:

Wpływ zastosowania włókien polimerowych na właściwości funkcjonalne betonu asfaltowego o wysokim module sztywności

Bańkowski W., Gajewski M., Horodecka R., Mirski K., Sybilski D.

Logistyka

2015

nr 4

2311--2321, CD2

W przedstawionej pracy oceniono skuteczność zastosowania włókien polimerowych do mieszanek typu ACWMS (beton asfaltowy o wysokim module sztywności). Przewidziano szeroki programu badań oraz analizę uzyskanych wyników badań pod kątem oceny wpływu zastosowanych włókien na wybrane właściwości mieszanki mineralno-asfaltowej (koleinowanie, zmęczenie, właściwości niskotemperaturowe, starzenie oraz odporność na działanie wody). Stwierdzono istotny wpływ zastosowania włókien na właściwości użytkowe, w szczególności poprawę odporności na deformacje trwałe, wodoodporność i zmęczenie.

In this study, the efficiency of polymer fibers application to the high modulus asphalt concrete was analyzed. The research program and analysis of the results obtained was planned in terms of assessing the impact of the fiber used on selected properties of asphalt (rutting, fatigue, low temperature properties, aging and resistance to water). A significant influence on the use of fiber properties was found, in particular the improvement of permanent deformation resistance, water resistance, and fatigue.

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.