Abstract
Equilibrium phase diagrams and thermophysical properties of mixtures of poly(styrene) (PS) and 4-cyano-4‘-n-octyl-biphenyl (8CB) are investigated. Three systems with widely different molecular weights of the polymer are considered in an attempt to assess the effects of the polymer size on the miscibility of PS and 8CB. The experimental phase diagrams are established using polarized optical microscopy (POM), light scattering (LS), and differential scanning calorimetry (DSC), and the results were analyzed with the predictions of the Flory−Huggins theory of isotropic mixing and the Maier−Saupe theory of nematic order generalized by McMillan to include smectic-A order. Good agreement is observed between theory and experiments. The solubility properties of mixtures with different polymer sizes are analyzed using the method suggested by Smith. The solubility limit of 8CB in PS is deduced from enthalpy changes at the nematic−isotropic transition temperature (TNI) as a function of polymer molecular weight. It is ...
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
