Melt flow behavior in capillary extrusion of nanosized calcium carbonate-filled poly(L -lactic acid) biocomposites

Ji Zhao Liang; Chak Yin Tang; Lin Zhou; Chi Pong Tsui; Feng Jiao Li

doi:10.1002/pen.23130

Melt flow behavior in capillary extrusion of nanosized calcium carbonate-filled poly(L -lactic acid) biocomposites

Ji Zhao Liang, Chak Yin Tang, Lin Zhou, Chi Pong Tsui, Feng Jiao Li

Research output: Journal article publication › Journal article › Academic research › peer-review

20 Citations (Scopus)

Abstract

Nanosized calcium carbonate (nano-CaCO3)-filled poly-L-lactide (PLLA) biocomposites were compounded by using a twin-screw extruder. The melt flow behavior of the composites, including their entry pressure drop, melt shear flow curves, and melt shear viscosity were measured through a capillary rheometer operated at a temperature range of 170-200°C and shear rates of 50-103s-1. The entry pressure drop showed a nonlinear increase with increasing shear stress and reached a minimum for the filler weight fraction of 2% owing to the "bearing effect" of the nanometer particles in the polymer matrix melt. The melt shear flow roughly followed the power law, while the effect of temperature on the melt shear viscosity was estimated by using the Arrhenius equation. Hence, adding a small amount of nano-CaCO3into the PLLA could improve the melt flow behavior of the composite. POLYM. ENG. SCI., 52:1839-1844, 2012.

Original language	English
Pages (from-to)	1839-1844
Number of pages	6
Journal	Polymer Engineering and Science
Volume	52
Issue number	9
DOIs	https://doi.org/10.1002/pen.23130
Publication status	Published - 1 Sept 2012

ASJC Scopus subject areas

General Chemistry
Polymers and Plastics
Materials Chemistry

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10.1002/pen.23130

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abstract = "Nanosized calcium carbonate (nano-CaCO3)-filled poly-L-lactide (PLLA) biocomposites were compounded by using a twin-screw extruder. The melt flow behavior of the composites, including their entry pressure drop, melt shear flow curves, and melt shear viscosity were measured through a capillary rheometer operated at a temperature range of 170-200°C and shear rates of 50-103s-1. The entry pressure drop showed a nonlinear increase with increasing shear stress and reached a minimum for the filler weight fraction of 2% owing to the {"}bearing effect{"} of the nanometer particles in the polymer matrix melt. The melt shear flow roughly followed the power law, while the effect of temperature on the melt shear viscosity was estimated by using the Arrhenius equation. Hence, adding a small amount of nano-CaCO3into the PLLA could improve the melt flow behavior of the composite. POLYM. ENG. SCI., 52:1839-1844, 2012.",

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AU - Liang, Ji Zhao

AU - Tang, Chak Yin

AU - Zhou, Lin

AU - Tsui, Chi Pong

AU - Li, Feng Jiao

PY - 2012/9/1

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N2 - Nanosized calcium carbonate (nano-CaCO3)-filled poly-L-lactide (PLLA) biocomposites were compounded by using a twin-screw extruder. The melt flow behavior of the composites, including their entry pressure drop, melt shear flow curves, and melt shear viscosity were measured through a capillary rheometer operated at a temperature range of 170-200°C and shear rates of 50-103s-1. The entry pressure drop showed a nonlinear increase with increasing shear stress and reached a minimum for the filler weight fraction of 2% owing to the "bearing effect" of the nanometer particles in the polymer matrix melt. The melt shear flow roughly followed the power law, while the effect of temperature on the melt shear viscosity was estimated by using the Arrhenius equation. Hence, adding a small amount of nano-CaCO3into the PLLA could improve the melt flow behavior of the composite. POLYM. ENG. SCI., 52:1839-1844, 2012.

AB - Nanosized calcium carbonate (nano-CaCO3)-filled poly-L-lactide (PLLA) biocomposites were compounded by using a twin-screw extruder. The melt flow behavior of the composites, including their entry pressure drop, melt shear flow curves, and melt shear viscosity were measured through a capillary rheometer operated at a temperature range of 170-200°C and shear rates of 50-103s-1. The entry pressure drop showed a nonlinear increase with increasing shear stress and reached a minimum for the filler weight fraction of 2% owing to the "bearing effect" of the nanometer particles in the polymer matrix melt. The melt shear flow roughly followed the power law, while the effect of temperature on the melt shear viscosity was estimated by using the Arrhenius equation. Hence, adding a small amount of nano-CaCO3into the PLLA could improve the melt flow behavior of the composite. POLYM. ENG. SCI., 52:1839-1844, 2012.

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Melt flow behavior in capillary extrusion of nanosized calcium carbonate-filled poly(L -lactic acid) biocomposites

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