Materials Literature
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Composites consisting of synthetic polymers and natural organic fillers have many applications. Plant-based materials, particularly wood, are used as fillers. Most frequently they are added to the polymer in the shape of wood flour or wood fibres. This type of polymer composite allows the possibility of modifying the…
Graft copolymers of silk sericin (SS) and methyl methacrylate (MMA) using ceric ammonium nitrate (CAN) as initiator have been synthesized under nitrogen atmosphere in aqueous media. Graft copolymers (SS-g-PMMA) were characterized by Fourier transform infrared (FTIR) spectrometry and scanning electron microscopy (SEM).…
The synthesis and mesophase characterization of a homologous series of five‐ring bent‐core compounds derived from 5‐methoxyisophthalic acid are described. Most of the compounds exhibit a polar antiferroelectric smectic C phase. Replacement of the terminal n‐alkoxy chains by n‐alkyl carboxylate groups, not only destabi…
Abstract We have integrated scientific research of polymer blends on the base of poly‐3‐hydroxybutyrate (PHB and its copolymers) with bench testing in blend preparation by both solvent casting and melt extrusion. As a second component, we have used traditional synthetic macromolecules with various hydrophilicity degre…
Pr-doped (1- x )BaTiO 3 – x CaTiO 3 ( x =0.20–1.0) ceramics were prepared by a solid-state reaction technique. Their structures were found to be a pure tetragonal phase for x ≤0.23, coexisting tetragonal and orthorhombic phases for x =0.25 to 0.90, and a pure orthorhombic phase for x ≥0.90, respectively. A large elect…
High-temperature electrical conductivities and leakage current behaviors of Dy-doped, and Dy and Mn codoped BaTiO 3 were investigated as a function of Ba/Ti ratio. Dy-doped BaTiO 3 specimens showed higher leakage currents under a continuously applied dc field stress at 150°C than undoped BaTiO 3 . The highest initial…
A brightness-enhanced transflective liquid crystal display having a single-cell gap was demonstrated in a vertically aligned (VA) configuration with a patterned retardation layer. The photopatterned retarder was made of a UV-polymerizable liquid crystal (LC) through a single patterning process. The homeotropic LC alig…
A new shear tester of woven fabrics based on the trellis shear model is described. The tester can be used to carry out shear deformation experiments under quite low tensile stresses. The values of shear rigidity tested on the new tester were compared with those tested on the uniaxial tensile tester and the KES (Kawaba…
We report on measurements of visible extinction spectra of semicontinuous silver nanoshells grown on colloidal silica spheres. We find that thin, fractal shells below the percolation threshold exhibit geometrically tunable plasmon resonances. A modified scaling theory approach is used to model the dielectric response…
Abstract New composites coupling the alloy and nanocomposite technologies have been successfully produced with regular co rotating twin screw extruder. These new composites, Polyamide(PA6)/Polyolefin(PO)/compatibilizer/nanoclay, have been blown to end up with monolayer films. The thermo mechanical performances of thes…
In the present study, the fcc→fct martensitic transformation and antiferromagnetic transition of the Mn82.2Ni17.8 alloy are studied by electric resistance measurement, dynamic mechanical analyzer, and transmission electron microscopy. The magnetic-field-induced strain associated with antiferromagnetic-order twin marte…
The bismuthinite - aikinite (Bi<sub>2</sub>S<sub>3</sub> - CuPbBiS<sub>3</sub>) series<sup> </sup>of ordered derivatives (superstructures) is based on the incremental<sup> </sup>Bi + vacancy <img src="http://canmin.geoscienceworld.org/math/rarr.gif" alt="->" style="width: 13px; height: 7px; border-width: 0px"/> Pb + C…
A novel method for the preparation of CuS nanoparticles based on the fast nucleation of the sulphide has been developed. The particles have been synthesized by reaction of thioacetic acid with water and copper carboxylates (acetate, propionate) in the corresponding carboxylic acid (acetic, propionic) as a solvent. The…
The phase structures, and dielectric and piezoelectric properties of three series of ceramic compositions in the Pb(Ni1∕3Nb2∕3)O3–Pb(Zn1∕3Nb2∕3)O3–PbTiO3 ternary system have been systematically investigated. The existence of the morphotropic phase boundary (MPB) line is proposed and a wide linear MPB region is verifie…
A novel soluble fluorinated polyimide containing a photosensitive chalcone unit in the main chain was investigated as a thermally stable photoalignment material for liquid crystals. A defect-free homogeneous alignment of liquid crystals was induced on the surface of a polymer film after exposure to linearly polarized…
The structural characteristics of alpha-helices in poly-alanine-based peptides have been investigated via molecular dynamics simulation with the goal of understanding the basic features of peptide simulations within the context of a model system, classical molecular dynamics with generalized Born (GB) solvation, and t…
Abstract New steroidal glycosides, stalagmosides I–V ( 1 – 5 ) and indicosides I and II ( 7 and 8 ), together with the known compounds carumbelloside III, lasianthoside A, and lasianthoside B, were isolated from whole plants of Caralluma stalagmifera and Caralluma indica , respectively. Their structures were elucidate…
The hydrothermal oxidation behavior of silicon nitride was studied as a function of vapor velocity in the range of 1–35 cm/s, at atmospheric pressure and ∼100% H 2 O, using a custom‐designed hydrothermal apparatus. At lower velocities, silicon nitride showed a marginal weight gain during early exposure times followed…
The results of direct measurements of the magnetic field induced entropy change in the Ni _{2.19} Mn _{0.81} Ga alloy are presented. It is shown that the largest entropy change in the magnetic field 2.6 T is equal to 11 J/kgK. The experimental data are compared with the theoretical results, obtained with the help of t…
This study focuses on the phase transformation induced during mixing fixed quantities of MoO 3 and Al 2 O 3 or aluminum powder (2, 3, 4, 5, 10, 20, 40, 50%). Different solid solutions were identified by x-ray powder diffraction, FTIR, and DTA. In the Al 2 O 3 concentration range 2–20%, the only phase present besides M…