THE 3
rd
INTERNATIONAL SCIENTIFIC CONFERENCES OF STUDENTS AND YOUNG RESEARCHERS
dedicated to the 99
th
anniversary of the National Leader of Azerbaijan Heydar Aliyev
391
II. New materials were presented to the industry due to the sudden growth in
demand for manufactured products. Aforementioned
new materials are
polymers and their influence can be observed in contemporary life. They are all
around us: clothes made from synthetic fibers, polyethylene cups, fiberglass,
nylon bearings, plastic bags, polymer-based paints, epoxy glue, silicone heart
valves, and Teflon-coated cookware. The list is almost infinite. Polymers can be
obtained naturally (e.g., cellulose, starch, and natural rubber), whereas the
synthetic polymers are manufactured. Both types of polymers are associated
with comfort and simplification of human life and are accountable for life itself.
By considering all these, it is not surprising that half of engineers from different
fields, scientists, textile technologies, pharmacists and other scientific groups
take part in research and development projects associated with polymers. It is
worth to mention that polymer chemistry is likely to intersect and cut the
conventional lines
of all branches of chemistry, biology, physics, material,
engineering, pharmacy, and also, medicine. [H.Namazi, 2017]
Shape memory polymers (SMP) are defined as the materials which are
able to return from a temporary shape to its original form by applying various
environmental stimuli such as heat, light, sound, and etc. when it is required.
SMPs belong to the group of “actively moving” polymers, since they actively
transform from one form to another one. [M. Behl, A. Lendlein, 2007] Most of
the polymers do not show shape memory effect by themselves and this effect
is the result of polymer morphology and specific processing combination.
During conventional processing, polymer is shaped into its initial, permanent
form, whereas, in the programming process, deformation of polymer sample
and fixing of impermanent shape occur. By applying stimulus, polymer
sample can return to its original shape and there is possibility to repeat the
cycle of these processes with various versions of temporary forms. SMPs
are elastic polymer networks that are equipped with proper stimuli-sensitive
switches and also, net points. The net points help to identify original shape
of polymer network and can have chemical or physical nature. In order to
show shape memory functionality, deformation of polymer network has to be
temporarily fixed under environmental conditions
based on specific
application. The procedure requires deformed chain segments which are
under external stress to be reversibly prevented from recoiling and this is
achieved by reversible net points which is introduced by physical interactions
or covalent bonds. [M. Behl, A. Lendlein, 2007] SMPs as a shape memory
material with many advantageous properties,
such as high programmable
strain, light weight, low cost, and biocompatibility were broadly utilized to
manufacture
actuators, micro-devices, biomedical equipment, deployable
and origami structures [M. Lei, Z.Chen, H.Lu and K.Yu, 2019].
The present research is devoted to the synthesis and analysis of new
shape memory polymer based on starch and vanillin.
All green plants
generate starch, which is a commercially accessible organic substance.