The objective of this study was to synthesize
new types of cholesteric liquid crystal compounds and study the anticoagulative
properties of their composite membranes. Three kinds of cholesteric liquid
crystal compounds were synthesized and characterized by infrared spectroscopy,
differential scanning calorimetry and optical polarizing microscope. The
polysiloxane, as a substrate, was blended with three liquid crystal compounds
and was then used as membranes. The anticoagulative property of different
polysiloxane liquid crystal composite membranes was identified by the blood
compatibility tests. Three cholesteryl liquid crystals synthesized in this work
contained hydrophilic soft chains and presented iridescent texture owned by
cholesteric liquid crystals in the range of their liquid crystal state
temperature, but only cholesteryl acryloyl oxytetraethylene glycol carbonate
was in the liquid crystal state at body temperature. When liquid crystals were
blended with polysiloxane to form polysiloxane/liquid crystal composite
membranes, the haemocompatibility of these membranes could be improved to some
extent. The blood compatibility of composite membranes whose hydrophilic property
was the best was more excellent than that of other composite membranes, fewer
platelets adhered and spread, and showed little distortion on the surface of
materials.
Source:IOPscience
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