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    COMPARATIVE STUDY OF PDLC COMPOSITES BASED ON NEMATIC AND SMECTIC LIQUID CRYSTALS

    Year: 2018

    Journal: Rev. Roum. Chim., Volume 63, JUL-AUG, page 649

    Authors: Ailincai, Daniela; Bejan, Andrei; Olaru, Anda Mihaela; Iftime, Manuela-Maria; Perju, Elena

    Organizations: European Union's Horizon 2020 research and innovation programme [667387]; Roumanian National Authority for Scientific Research and Innovation, CNCS/CCCDI - UEFISCDI, within PNCDI III [PN-III-P3-3.6-H2020- 2016-0011]

    Keywords: polymer dispersed liquid crystals; bio-applications; biocompatibility; composites

    Two different polymer dispersed liquid crystals (PDLC) systems have been prepared by dispersing two mesogenic compounds: a first one with a nematic mesophase 4-cyano-4'-pentylbiphenyl and a second one with a smectic mesophase: Butyl-p-[p'-n-octyloxy benzoyloxy] benzoate in a biocompatible polymeric matrix: polyvinyl alcohol boric acid. Combining the advantages of PVA with the ones of boric acid, the PVAB proved to be able to interact with the liquid crystals molecules constraining them to form droplets with a narrow dimensional polydispersity as was observed by polarized optical microscopy (POM) and scanning electron microscopy (SEM). The systems have been characterized also by differential scanning calorimetry (DSC), revealing once more the interactions established between the polymeric matrix and the liquid crystal molecules. In order to estimate the potential biocompatibility of the developed systems, their wettability was determined by measuring the water to air contact angle and by calculating the surface forces, being observed that the structure of the liquid crystals is an essential parameter influencing the characteristics of the PDLC composites.