Melt flow behavior in capillary extrusion of nanosized calcium carbonate-filled poly(L -lactic acid) biocomposites
作者： Ji-Zhao Liang , Chak-Yin Tang , Lin Zhou , Chi-Pong Tsui , Feng-Jiao Li
DOI: 10.1002/PEN.23130
关键词:
摘要: 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, shear curves, and viscosity measured through capillary rheometer operated at temperature range 170–200°C rates 50–103 s−1. drop showed nonlinear increase with increasing stress reached minimum for filler weight fraction 2% owing to “bearing effect” nanometer particles in polymer matrix melt. roughly followed power law, while effect on was estimated Arrhenius equation. Hence, adding small amount nano-CaCO3 into PLLA could improve composite. POLYM. ENG. SCI., 52:1839–1844, 2012. © 2012 Society Plastics Engineers
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