Temperatute Dependent Flow Instabilities of Highly Filled Polymer Compounds

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Temperatute Dependent Flow Instabilities of Highly Filled Polymer Compounds

Popis výsledku v původním jazyce

Highly filled polymer compounds are used for production of hard-metal parts by metal injection moulding (MIM technology). Compounds of hard-metal carbide powder (40 - 55 vol. %) and multicomponent polymeric binder based on PE, EBA and paraffin were prepared by melt mixing at 180 °C. The melt flow was investigated at a temperature range from 140 °C to 200 °C using capillary rheometer operating flow at constant piston speed. At higher temperatures the highly filled compounds (above 45 vol. %) exhibited anunstable flow characterized by pressure oscillations at the shear rates above 1000 s-1. The onset of unstable flow depended on the filler content and temperature. The activation energy of the shear flow was strongly dependent on the shear rate and the filler content. The Arrhenius relation was valid for the compounds in the stable flow region only. Two different dependencies of pressure oscillations amplitude on temperature were observed: decrease (for 55 vol. %) and increase (for 50 vo

Název v anglickém jazyce

Temperatute Dependent Flow Instabilities of Highly Filled Polymer Compounds

Popis výsledku anglicky

Highly filled polymer compounds are used for production of hard-metal parts by metal injection moulding (MIM technology). Compounds of hard-metal carbide powder (40 - 55 vol. %) and multicomponent polymeric binder based on PE, EBA and paraffin were prepared by melt mixing at 180 °C. The melt flow was investigated at a temperature range from 140 °C to 200 °C using capillary rheometer operating flow at constant piston speed. At higher temperatures the highly filled compounds (above 45 vol. %) exhibited anunstable flow characterized by pressure oscillations at the shear rates above 1000 s-1. The onset of unstable flow depended on the filler content and temperature. The activation energy of the shear flow was strongly dependent on the shear rate and the filler content. The Arrhenius relation was valid for the compounds in the stable flow region only. Two different dependencies of pressure oscillations amplitude on temperature were observed: decrease (for 55 vol. %) and increase (for 50 vo

Druh

D - Stať ve sborníku

CEP obor

CD - Makromolekulární chemie

OECD FORD obor

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Projekt

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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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