2.5. Melt rheology study
The melt behavior of neat PLA, extruded PLA, and CaCO3-PLA biocomposites at low shear rate was
investigated by rotational rheometer (Plate & Plate Rheometer, Rheometric Scientific, TA Instruments) with steady
shear rate sweep range of 0.01 – 150.0 s-1. The temperature of the test was fixed at 170oC as same as die temperature
in the processing. Moreover, the melt behavior of biocomposites at high shear rate as occurred in the extrusion sheet
process was observed by capillary rheometer (Bohlin Instrument Company, model RH2200). The majority of the
experiments were carried out using the barrel having diameter and length of 15 mm and 250 mm, respectively and a
capillary die having the L/D ratio of 16/1 mm/mm in right barrel and a zero die as a reference in left barrel. The
obtained data were corrected according to the Bagley correction. The temperature of testing condition was 170oC,
equivalent to die temperature in the extrusion sheet process.
2.5. Melt rheology study
The melt behavior of neat PLA, extruded PLA, and CaCO3-PLA biocomposites at low shear rate was
investigated by rotational rheometer (Plate & Plate Rheometer, Rheometric Scientific, TA Instruments) with steady
shear rate sweep range of 0.01 – 150.0 s-1. The temperature of the test was fixed at 170oC as same as die temperature
in the processing. Moreover, the melt behavior of biocomposites at high shear rate as occurred in the extrusion sheet
process was observed by capillary rheometer (Bohlin Instrument Company, model RH2200). The majority of the
experiments were carried out using the barrel having diameter and length of 15 mm and 250 mm, respectively and a
capillary die having the L/D ratio of 16/1 mm/mm in right barrel and a zero die as a reference in left barrel. The
obtained data were corrected according to the Bagley correction. The temperature of testing condition was 170oC,
equivalent to die temperature in the extrusion sheet process.
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