First normal stress difference in capillary extrusion flow of nanometer calcium carbonate‐filled PLLA biocomposites
作者： Ji-Zhao Liang
DOI: 10.1002/PEN.23435
关键词:
摘要: The nanometer calcium carbonate (nano-CaCO3)-filled poly-L-lactide (PLLA) biocomposites were prepared using a twin-screw extruder. first normal stress difference of the composites measured by means capillary rheometer under experimental conditions with temperatures ranging from 170 to 200°C and shear rates varying 50 103 s−1. (N1) increased roughly linearly increasing (τw). sensitivity N1 τw an increase die length–-diameter ratio, value varied slightly filler weight fraction (ϕf) as test temperature was constant. When fixed, reached minimum for ϕf = 1%. values composite melts decreased rise when rate POLYM. ENG. SCI., 2013. © 2012 Society Plastics Engineers
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