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
chloride (PLAM). Then, the PLASTARCH was obtained by grafting
PLAM onto (NC). The evolution of the reactions was studied by
infrared spectroscopy, which confirmed the success of each step.
The grafting was investigated by TGA, FTIR and DSC. Furthermore,
large differences were observed between the material consisting of
a physical mixture of PLA and NC (PLA-NC blend) and that obtained
by chemical modification (PLASTARCH).
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
chloride (PLAM). Then, the PLASTARCH was obtained by grafting
PLAM onto (NC). The evolution of the reactions was studied by
infrared spectroscopy, which confirmed the success of each step.
The grafting was investigated by TGA, FTIR and DSC. Furthermore,
large differences were observed between the material consisting of
a physical mixture of PLA and NC (PLA-NC blend) and that obtained
by chemical modification (PLASTARCH).
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