Molecular weights of composite matrix (PLA) as well
as non-processed PLA granules were measured by using
gel permeation chromatography (GPC). Measurements
were carried out using an Agilent chromatograph with a
Polymer linear column at 25 °C. Chloroform was used
as the solvent and the flow rate was 1.0 mL/min with
an injection volume of 20 µm. The molecular weight
and polydispersity were calculated from a calibration
curve made from polystyrene standards with the results
expressed as “polystyrene equivalent” molecular weight.