Abstract
A side-chain liquid crystalline polyurethane (LCPU) based on NCO- terminated polybutadiene and bi-phenol has been synthesized. The characterization of LCPU samples was done using gel permeation chromatography, scanning electron microscopy, differential scanning calorimetry, thermogravimetry, and polarized optical microscopy. The tensile properties of LCPU samples were also investigated. The samples show a high value of polydispersity index (4.51), which may be associated with the liquid crystalline phase (biphenyl moieties). The glass transition and the melting temperatures were found to be 62°C and 230°C respectively. The estimated average tensile strength, modulus, and the maximum elongation are 2.365 MPa, 2.0 MPa, and 583% respectively. The polarized optical micrographs of LCPU samples at 175°C and 200°C show birefringent crystalline areas. The mesophase starts appearing at 175°C and as the temperature increases, fibrous ordered structures start appearing.
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