Polymer-dispersed liquid crystal (PDLC) systems based on polysulfone as carrying matrix and 4-cyano-4ʹ-pentylbiphenyl (5CB) (LC) were obtained thin transparent films. The PDLC films prepared by solvent- thermally induced phase separation methods, with various compositions in the two components. Information was polarised light optical microscopy, differential scanning calorimetry electron microscopy. composites show well-defined droplets of submicrometric size, around 650 nm for a medium...

The synthesis of novel dielectric elastomers that show a muscle-like actuation when exposed to low electric field represents major challenge in materials science. Silicone modified with polar side groups are among the most attractive dielectrics for such purpose because their high polarizability over wide temperature and frequency range. Nitroaniline (NA) has strong dipole moment, therefore, its incorporation into silicone networks should allow formation increased permittivity. However,...

This study investigates the liquid crystalline behavior, photophysical properties, and metal ion sensing capabilities of a pyrene-based imine dimer (DPyH9). The compound exhibits monotropic nematic mesophase with glass transition at 43 °C, as confirmed by polarized light microscopy (PLM) differential scanning calorimetry (DSC). Its including UV-vis absorption, solvatochromic fluorescence, acidochromism, observed through spectral shifts upon HCl addition, were systematically analyzed....

The thermotropic and optical characterisations of a novel polymer dispersed liquid crystal (PDLC) system based on polysulfone UDEL P-1700 as matrix low molecular weight compound containing mesogenic azomethine core cyano-substituent were investigated. PDLC samples prepared by solvent-induced phase separation (SIPS) thermally induced (TIPS) methods using various compositions in the two components. Information morphology structure was obtained polarising microscopy, differential scanning...

Novel semiflexible polyazomethines containing chromophoric units into azomethine mesogenic core have been synthesised by condensation of a flexible dialdehyde with diamines fluorene, antraquinone, pyrimidine, azobenzene and benzophenone. The thermotropic behaviour the resulting was assessed differential scanning calorimetry, polarised light microscopy investigations miscibility relations. While pure showed birefringent viscous texture difficult to be ascribed, mixing liquid crystal dimer,...

Chemically cross-linked polydimethylsiloxane (PDMS) elastomers have gained importance as a dielectric in elastic capacitor actuators, which elongate when electrically charged. Common PDMS permittivity of only about 3 and thus elongations interesting for real applications occur at high voltages. In this work, new class silicone-based with increased are synthesized starting from polymethylvinylsiloxane thioacetic acid via photo-induced thiol-ene reaction, whereby polar thioacetate groups...

A series of new azomethine dimers was synthesized by the condensation reaction flexible bis-benzaldehydes with four aromatic amines containing phenyl, naphthyl, anthracene and pyrene groups. Their right structure confirmed FTIR 1H-NMR spectroscopy their thermal properties were investigated thermogravimetric analysis, differential scanning calorimetry polarized light optical microscopy. view on photophysical behavior gained UV-vis photoluminescence spectroscopy. The presented liquid...

The preparation, characterisation, thermotropic and optical properties of low-molecular azomethines with or without methoxy side group are described in this paper. azomethine compounds were synthesised by condensation reaction o-dianisidine/benzidine para-halogen substituted benzaldehyde. Their analysed differential scanning calorimetry, thermogravimetry analysis, polarised microscopy, X-ray diffraction spectroscopy. present liquid crystalline behaviour large mesophase range high thermal...

We report the preparation and thermotropic characterization of a novel polymer-dispersed liquid crystal (PDLC) system based on polysulfone (PSU) UDEL-1700 as polymer matrix 4-[4-(n-butyloxy)phenylene-imino-methylidene]benzonitrile crystal. PDLC films have been prepared using thermal-induced phase separation (TIPS) technique, with different compositions in two components. A detailed optical polarized microscopy differential scanning calorimetry study has carried out to evaluate correlation...

The synthesis of three novel tetracyclosiloxane monomers modified either with a nitroaniline (NA) or Disperse Red 1 (DR1) push-pull group and their ring opening polymerization reaction in the presence tetramethylammonium hydroxide are presented. prepared polymers were characterized by different spectral methods gel permeation chromatography. For crystalline monomers, structures further proven single crystal X-ray diffraction. Dynamic scanning calorimetry shows that carry NA groups have glass...

The liquid crystalline (LC) behavior of a literature-reported asymmetric azomethine compound (4-[4-(n-butyloxy)-benzylideneimino]-chlorobenzene, Cl.O4) was investigated by using optical polarized light microscopy, differential scanning calorimetry and medium-wide angle X-ray diffraction. FTIR in attenuated total internal reflection configuration employed to study the microstructural changes occurring during phase transitions azomethine. Spectral modifications, associated with molecular...

AbstractThe liquid crystalline behavior of an azomethine, namely 4-chlorobenzylidene-4-n-butoxyaniline (M), was investigated by using optical polarized light microscopy, differential scanning calorimetry, thermo-optical analysis and powder X-ray diffraction at temperature. Fourier transform infrared spectroscopy (FTIR), in attenuated total internal reflection configuration, employed order to analyze the microstructural changes occurring during azomethine phase transitions. Specific sensitive...

A new series of thermotropic polyazomethines (PAMs) containing flexible spacers in the main chain and side methoxy groups on mesogenic core has been synthesised by solution polycondensation reaction o-dianisidine with α,ω-bis(4-formylphenoxy)-alkanes. model compound was also condensation p-butoxybenzaldehyde, order to accomplish structural characterisation for a better understanding polymer properties. Chemical structure studied polymers confirmed Fourier transform infrared spectroscopy...

ABSTRACT A synthetic strategy to polydimethylsiloxanes and polymethylsiloxanes containing thiol functions as end‐ or side‐groups, respectively, is presented. Such polymers are important starting materials for elastomeric networks postpolymerization modifications. The synthesis starts either with vinyl end‐functionalized polymethylvinylsiloxanes. groups reacted thioacetic acid a acid/butanethiol mixture via UV‐initiated thiol‐ene reaction form the respective thioester quantitatively within...

Organic–inorganic hybrid materials have been obtained by impregnating a mesomorphic polyazomethine into porous inorganic matrix of zinc oxide (ZnO), tin dioxide (SnO 2 ), or mixed ZnO/SnO . The has magnetron sputtering technique and proved very high crystallinity degree. resulting were characterized from morphological optical points view scanning electron microscopy, atomic force ultraviolet-visible photoluminescence spectroscopy. itself exhibited highly rough surface, which became smoother...

A mixture of polymeric complexes based on the reaction between Re(CO)5Cl and porous network coming from coupling melamine benzene-1,3,5-tricarboxaldehyde was obtained characterized by FTIR, NMR, SEM, XPS, ICP, XRD, cyclic voltammetry (CV). The formed rhenium-based hybrid material reveals a noticeable capability CO2 absorption. gas absorption amount measured at 295 K close to 44 cm3/g 1 atm. An interesting catalytic activity for reduction (CO2RR) is observed, resulting in turn over-number...

ATR-FTIR spectroscopy was first used as an important and complementary technique to investigate the phase transition of two phosphorus-containing diesters, representing a pioneering study on organophosphorus-based liquid crystals.

Main-chain azomethine liquid crystal (LC) polymers varying in spacer length were studied using differential scanning calorimetry and polarizing optical microscopy. The nematic droplets appearing across the isotropic-nematic phase transition during cooling polymer melt treated statistically their size distributions described with equation based on principles of irreversible thermodynamics. Kinetics ordered growth was analytically universal law for cluster growth. Analysis mean LC droplet...

The development of novel functional dielectric materials can open the doors to major technological innovations with societal impact. Stretchable capacitors transduce electrical into mechanical energy or vice-versa. Over last 20 years, they have received significant interest from academia and industry. However, this technology still needs both improved dielectrics as well conductive elastomers achieve desired low driving voltage realize devices attractively high sensitivity. currently most...