Flow Instability and Electrical Conductivity of Composites of Hard Metal Carbides in Polymer Matrix

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F01%3A63500234" target="_blank" >RIV/70883521:28110/01:63500234 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Flow Instability and Electrical Conductivity of Composites of Hard Metal Carbides in Polymer Matrix

Popis výsledku v původním jazyce

Investigation of the flow behaviour of melted composites of hard metal carbide powder in a polymer matrix showed that at high filler loading (50 vol.%) in a capillary rheometer operating at a constant piston speed pressure oscillations occurred. This flow instability has been attributed to the thin interparticle layers leading to a strong particle interaction. The measurement of electric conductivity of the solid composite materials in this range of particle concentration demonstrated that its dependence on temperature suggests a specific composite structure with a great number of conducting contacts. Unlike the composites with lower particle concentration, where the expansion of the non-conducting polymer matrix with increasing temperature caused interruption of conducting paths and a rapid drop in conductivity (switching effect), at high filler content most of conducting contacts remain unchanged and conductivity decreased with temperature only slightly.

Název v anglickém jazyce

Flow Instability and Electrical Conductivity of Composites of Hard Metal Carbides in Polymer Matrix

Popis výsledku anglicky

Investigation of the flow behaviour of melted composites of hard metal carbide powder in a polymer matrix showed that at high filler loading (50 vol.%) in a capillary rheometer operating at a constant piston speed pressure oscillations occurred. This flow instability has been attributed to the thin interparticle layers leading to a strong particle interaction. The measurement of electric conductivity of the solid composite materials in this range of particle concentration demonstrated that its dependence on temperature suggests a specific composite structure with a great number of conducting contacts. Unlike the composites with lower particle concentration, where the expansion of the non-conducting polymer matrix with increasing temperature caused interruption of conducting paths and a rapid drop in conductivity (switching effect), at high filler content most of conducting contacts remain unchanged and conductivity decreased with temperature only slightly.

Druh

D - Stať ve sborníku

CEP obor

CD - Makromolekulární chemie

OECD FORD obor

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Projekt

<a href="/cs/project/GP104%2F01%2FP129" target="_blank" >GP104/01/P129: Vliv deformace na změnu elektrického chování elastických kompozitů v oblasti perkolačního prahu</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2001

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

The Polymer Processing Society - 17th, Annual Meeting

ISBN

-

ISSN

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e-ISSN

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Počet stran výsledku

1

Strana od-do

10-10

Název nakladatele

PPS

Místo vydání

Canada, Montreal

Místo konání akce

Canada, Montreal

Datum konání akce

21. 5. 2001

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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