✦ LIBER ✦

Melt rheology of nanometre-calcium-carbonate-filled acrylonitrile–butadiene–styrene (ABS) copolymer composites during capillary extrusion

✍ Scribed by Ji-Zhao Liang

Publisher: John Wiley and Sons
Year: 2002
Tongue: English
Weight: 128 KB
Volume: 51
Category: Article
ISSN: 0959-8103
DOI: 10.1002/pi.1091

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✦ Synopsis

Abstract

The melt flow properties during capillary extrusion of nanometre‐calcium‐carbonate‐filled acrylonitrile–butadiene–styrene (ABS) copolymer composites were measured by using a Rosand rheometer to identify the effects of the filler content and operation conditions on the rheological behaviour of the sample melts. The experiments were conducted under the following test conditions: temperature varied from 220 to 240 °C and shear rate ranged from 10 to 10^4^ s^−1^. The filler volume fractions were 0, 10, 20, 30, 40 and 50%. The results showed that the shear flow did not strictly obey the power law under the test conditions, and that the entry pressure drop (Δ__P__~en~) and the extension stress (σ~e~) in entry flow increased nonlinearly, while the melt shear viscosity (η~s~) and extension viscosity (η~e~) decreased with increasing the wall shear stress (τ~w~) at constant test temperature. The dependence of the melt shear viscosity on the test temperature was approximately consistent with the Arrhenius expression at fixed τ~w~. When τ~w~ was constant, η~s~ and η~e~ increased while Δ__P__~en~ and σ~e~ decreased with the addition of the filler volume fraction.