(Fig. 1) was followed by FTIR analysis. After 3 days, distilled water
was used to stop the esterification reaction. Then, the precipitate
was washed with ethanol several times and finally, this solid was
centrifugated with methyl ethyl ketone four times (3000 rpm,
15 min) until NC were not observed in the supernatant. The solid
obtained (PLASTARCH) was left at room temperature for 24 h,
dried in a vacuum oven and stored under vacuum until further
use. To estimate the NC content of PLASTARCH, the successive
washing liquids were collected and analyzed, finding 0.08 g of
NC. From this data, the content of NC in the PLASTARCH was
estimated as 3.2 wt%.
Fig. 2 shows the results of SEC experiments for the different
samples, PLA, PLABz, PLAM and PLASTARCH. A slight decrease of
the molecular weight can be observed due to the benzoylation step.
It is related to the change of the coil size because of the increased
free volume produced by the modification of PLA (increased flexibility
of the chain).
(Fig. 1) was followed by FTIR analysis. After 3 days, distilled water
was used to stop the esterification reaction. Then, the precipitate
was washed with ethanol several times and finally, this solid was
centrifugated with methyl ethyl ketone four times (3000 rpm,
15 min) until NC were not observed in the supernatant. The solid
obtained (PLASTARCH) was left at room temperature for 24 h,
dried in a vacuum oven and stored under vacuum until further
use. To estimate the NC content of PLASTARCH, the successive
washing liquids were collected and analyzed, finding 0.08 g of
NC. From this data, the content of NC in the PLASTARCH was
estimated as 3.2 wt%.
Fig. 2 shows the results of SEC experiments for the different
samples, PLA, PLABz, PLAM and PLASTARCH. A slight decrease of
the molecular weight can be observed due to the benzoylation step.
It is related to the change of the coil size because of the increased
free volume produced by the modification of PLA (increased flexibility
of the chain).
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