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Hydrogels are highly hydrated three dimensional networks with the
ability to mimic the extracellular matrix of bodily tissues and
have thus found application in a wide range of biomedical
applications. Unique physiochemical properties such as
biocompatibility, water permeability, stimuli responsiveness and
self-healing characteristics make them especially useful for use as
scaffolds and matrices drug delivery, tissue
engineering/regeneration and sensing. Their weak and brittle
nature, however, often limits their widespread application where
improved mechanical strength is required. To resolve this problem,
there has been a significant amount of research into the
improvement of their mechanical properties. Among these efforts,
versatile multicomponent hydrogels have received much attention as
their physiochemical properties can be structurally engineered to
provide a wide range of desired properties. These multicomponent
formulations also allow for the combination of natural and
synthetic polymers, which offers the scope to exploit the
advantages of each component, with the synergistic effects
resulting from mutual interactions. This book critically discusses
the fundamental chemistry, synthesis, characterisation,
physiochemical and biological properties of various types of
multicomponent hydrogels. It reviews the different strategies
employed in designing and synthesizing cutting-edge multicomponent
hydrogels and their key applications in biomedical fields. The work
is suitable for researchers working in the specific area of
multicomponent hydrogels, and also more generally for those working
in materials science, biomedical engineering, biomaterials science
and tissue engineering.
High performance polymers such as polyamides, polyimides,
poly(amide imide)s, poly(ester-imide)s, etc., have attracted great
attention in recent years due to their unique combination of
toughness, lightness and dimensional stability at high temperatures
and resistance to thermooxidative degradation. In this regard,
poly(amide imide)s (PAIs) have captured the attention of scientists
and engineers alike as materials that offer outstanding properties
for high performance applications. The objective of the present
investigation was to synthesis soluble poly(amide imide)s
containing tricomponent structures of dianhydride, diamine and acid
chloride by low temperature solution polymerization method,
following by thermal cycloimidization. The effect of structural
changes (anhydrides and diamines) on the thermal and
thermooxidative properties of the polymer was studied in detail.
Further the kinetic aspects of thermal cycloimidization of
poly(amide amic acid)s (PAAs) to the corresponding PAIs were also
inspected by TGA and FT-IR techniques at different time intervals.
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