Dynamical behavior and density of the Polymer / Liquid Crystal blends prepared by polymerization induced phase separation

In this work we are interested with the dynamic behavior and density of PDLCs films (Polymer Dispersed Liquid Crystals).constituted of the microdroplets of nematic liquid crystal E7 dispersed in two types of polymer matrix; Tripropylene glycol diacrylate (TPGDA) or Propoxylene-glyceryl-triacrylate (GPTA). These films are prepared by polymerization induced phases separation by electron-beam (EB) or ultra-violet (UV) radiation. Films obtained are characterized by a Dynamic Mechanical Thermal Analysis. The experimental results show that GPTA films have a module of conservation higher than that of TPGDA films for the two types of irradiation. Density of these films with various thicknesses is given with and without liquid crystal for to see the effect of this last on the properties of the TPGDA/E7 and GPTA/E7 systems. The presence of microdroplets of liquid crystal E7 in the matrix TPGDA or GPTA affect the density of systems studied who is weaker for the films with matrix TPGDA; this can be connected with the nature of the monomers GPTA three-functionals, what carries with films more dense.