The chromatic transition from blue
to red in polydiacetylene (PDA)
membranes can be used for optical sensing in various applications
ranging from use as chemosensors to the quality control of foods and
medicines. The preparation of PDAs embedded in poly(vinyl alcohol)
(PVA) can be considered one of the simplest and most viable methodologies
for obtaining membranes with colorimetric responses. However, it is
still a scientific challenge to understand how the polymeric matrix
affects the chromatic transition of PDAs and how to control it. In
this work, PDA/PVA hydrogels were prepared to study its thermochromism.
The colorimetric responses of these hydrogels were compared with that
of PDA vesicle suspensions in order to show how the matrix of PVA
affects the color transition. Theoretical calculations have been carried
out to provide atomistic insights into the involved mechanism, showing
how the noncovalent interactions with the PVA matrix decrease the
rotational energy barrier of the PDA. Finally, in an attempt to modulate
the thermochromism of the hydrogels, membranes were obtained by gelling
PDA/L64 blends in the PVA matrix, using different concentrations of
the L64 copolymer. The results showed that the chromatic transition
of the PDA/L64/PVA membranes is more sensitive at lower temperatures
with increasing L64 concentration.
Desenvolvimento de filamentos de PLA e óxido de grafeno para melhoria termomecânica de peças produzidos por impressão 3D Development of PLA and graphene oxide filaments for thermo-mechanical improvement of parts produced by 3D printing
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