Starch-PLA composites seem to be a most promising combination
for starch-based packaging, but PLA and starch are thermodynamically
immiscible [10,11] and thus, compatibility problems
must be solved first in order to obtain competitive materials.
Although in the last years, there have been some reports on blends
of these polymers [12,13], the chemical grafting is a new and better
alternative to overcome the incompatibility problems between
starch and PLA.
The aim of this work was the development of new biodegradable
materials with high thermal stability to be used in packaging.
To accomplish this goal, we used a strategic synthetic pathway not
reported before, which consists of three reaction steps to modify
PLA, and further allowing an appropriate grafting of PLA onto the
surface of starch nanocrystals (NC). PLA was subjected to the
following modifications. The first reaction was carried out to
protect the PLA hydroxyl groups with benzoyl chloride and a new
material was obtained (PLABz). The second one was performed to
activate the terminal carboxylic acid by treatment with thionyl
Starch-PLA composites seem to be a most promising combination
for starch-based packaging, but PLA and starch are thermodynamically
immiscible [10,11] and thus, compatibility problems
must be solved first in order to obtain competitive materials.
Although in the last years, there have been some reports on blends
of these polymers [12,13], the chemical grafting is a new and better
alternative to overcome the incompatibility problems between
starch and PLA.
The aim of this work was the development of new biodegradable
materials with high thermal stability to be used in packaging.
To accomplish this goal, we used a strategic synthetic pathway not
reported before, which consists of three reaction steps to modify
PLA, and further allowing an appropriate grafting of PLA onto the
surface of starch nanocrystals (NC). PLA was subjected to the
following modifications. The first reaction was carried out to
protect the PLA hydroxyl groups with benzoyl chloride and a new
material was obtained (PLABz). The second one was performed to
activate the terminal carboxylic acid by treatment with thionyl
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