Title
Liquid Crystal and Its QuasiEquilibrium Phase Separation: Studies of Thermally Induced Phase Separation of Liquid Crystals and ,Used
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Thermally induced phase separation of liquid crystal and prepolymer mixtures were studied using liquid crystal K15 and K21, two of the four components of commercially available liquid crystal E7 and a thiolene prepolymer, UV1. The main purpose of this study was to construct quasiequilibrium phase diagrams of K15/UV1 and K21/UV1. Phase separation of liquid crystal/prepolymer system was observed using polarized optical microscopy. Liquid crystal/Prepolymer mixtures (K15/UV1 and K21/UV1 mixtures) were prepared with increasing percentage of liquid crystal in prepolymer. Each sample was then subjected to quasiequilibrium thermal cycles. Phase separation was detected by the onset of the formation of liquid crystal droplets in the homogeneous mixture. A quasiequilibrium phase diagram of K15/UV1 was constructed by plotting quasiequilibrium phase separation temperature with respect to K15 percentage in UV1 prepolymer. For K21/UV1 mixtures, quasiequilibrium thermal cycles resulted in crystallization. We decided to run slowrate thermal cycles instead of quasiequilibrium thermal cycles. Phase diagram of K21/UV1 was constructed using the slowrate thermal cycle data.
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