Preparation and characteristics of functional microcapsules consisting of liquid crystalline polymer as a skelton material

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Preparations of microcapsules consisting of liquid crystalline polymer as a skelton material and measurements of their release characteristics were carried out as follows ;1. Synthesis of thermal responsible liquid crystalline monomer (BHE)According to the prescribed method developed by our laboratory a liquid crystalline monomer 1- [6- (4-biphenylyloxy) hexyloxycarbonyl] -ethylene was synthesized. The monomer is solid at ordinary temperature.2. Preparation of microspheres with suspension polymerization and measurement of polarized light transmittance response with temperature.About 200 mum polymer microspheres were obtained by carrying out the suspension polymerization at 80ﾟC in a stirred tank reator. Phase change from liquids crystalline state to isotropic state was recognized by measuring the light transmittance of microspheres (fused) through a polarizing plate with increasing temperature.3. Preparations of liquid crystalline polymer having controlled average molecular weight with … More solution polymerizationSeven kinds of liquid crystalline polymer materials ranging from 1000 to 22000 of average molecular weight were prepared by the solution polymerization in benzene at prescribed monomer concentrations and prescribed initiator (AIBN) concentrations.4. Release characteristics of liquid crystalline microcapsulesSeveral kinds of microcapsules consisting of polystirene and poly-BHE copolymer as skelton material were prepared and their release characteristics were measured t various temperature (is the range of 30 to 70ﾟC). Consequently, two discontinuous dependencies of the permeation coefficients on temperature were found and these were suggested to correspond to the phase changes (from solid to liquid crystalline and from liquid crystalline to isotropic). Furthermore, it is found that the controlling the temperature dependency of liquid crystalline polymer microcapsules is possible.A fundamental permeation study of Na+ transportion through the membrane was carried out using a liquid crystalline polymer membrane, and our proposed release mechanism of the liquid crystalline polymer microcapsules was confirmed. Less