the oxygen
permeability coefficient and water vapour transmission rate
rise. Nevertheless this rise is clearly less important than for
PEG formulations which show a decrease in their barrier
properties already at 9 wt% of PEG content. Taking into
account these different results, ATBC is a more adapted
plasticizer than PEG. Nevertheless a trade off has to be
found between improvement of mechanical properties and
loss of barrier properties, probably between 9 and 17 wt%
of ATBC present in PLA.