Authors Al-Hussein, M. ; Berndt, A. ; Jehnichen, D. ; Häußler, L. ; Stamm, M. ; Pospiech, D.
Title Structural investigation of P(BPMA/CPPHMA) and P(MMA/BPMA/CPPHMA) copolymers
Date 05.09.2016
Abstract We present a detailed structural characterization of 6-[4-(4´-cyanophenyl)phenoxy]hexyl methacrylate (CPPHMA) side chain liquid crystal homopolymer and its copolymers with either 4-benzoylphenyl methacrylate (BPMA) or methyl methacylate (MMA) and BPMA. The thermotropic properties of copolymers with stepwise varied chemical composition are investigated with differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Two-dimensional and temperature-dependent X-ray scattering measurements are employed to determine the liquid crystalline phase behavior and to elucidate the copolymer microstructure. While the P(CPPHMA) homopolymer exhibits a smectic A phase, copolymers having CPPHMA comonomer content of 79 mol% and higher show weak liquid crystalline behavior. Structural models are proposed for the layered smectic phase of the homopolymer and the copolymers on the basis of the results of the X-ray measurements.
Journal Colloid and Polymer Science 294 (2016) 1475-1481

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