Materials Literature
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Abstract Crosslinked cis ‐1,4‐polybutadiene (PB) rubber is known to undergo crystallization during mechanical deformation. This article presents small‐angle X‐ray scattering (SAXS), wide‐angle X‐ray scattering (WAXS), and stress‐relaxation studies of the structural development in crosslinked PB samples crystallized un…
Abstract The preparation of the addition products of H 3 PO 4 to bisphenol A based epoxy resins is described. These products are considered modifiers of the epoxy resins and for the further formation of useful networks (coatings and related products). Depending on the ratio of H 3 PO 4 to epoxy groups and other reacti…
The luminescence spectra of [(tpy)(2)Ir(CN-t-Bu)2](CF(3)SO(3)) in methylcyclohexane glass and frozen n-nonane at 15 K reveal well-resolved vibronic fine structure. The vibronic peaks are assigned by comparison with the vibrational frequencies obtained from Raman and IR spectra and those obtained using DFT electronic s…
Abstract A new liquid‐crystalline epoxy monomer (LCEM) containing central triaromatic mesogen and aliphatic spacers consisting of eight methylene units terminated with epoxy groups was synthesized and characterized by means of IR and NMR spectrometry, differential scanning calorimetry (DSC), polarized optical microsco…
Two isostructural charge-transfer salts κ-(ET) 4 [M(CN) 6 ][N(C 2 H 5 ) 4 ]·2H 2 O (ET = bis(ethylenedithio)tetrathiafulvalene and M = Co III, Fe III ) were synthesized, and their crystal structures, Raman spectra, electrical conductivities, electron spin resonance (ESR), and static magnetic susceptibilities as a func…
Abstract The effect of thermal history on the nonisothermal crystallization of poly( L ‐lactide) (PLA) was studied. The cold crystallization of PLA by heating from the glassy state was dominated by the heating rate. However, the temperature to which PLA was cooled before crystallization markedly affected the crystalli…
Abstract A fusion/extraction technique was applied for the syntheses of en solvated ( en = 1,2‐diaminoethane) sodium salts of ortho ‐chalcogenostannate anions, [Na 4 ( en ) 4 ][SnE 4 ] with E = Te ( 1 ) or Se ( 2 ), possessing homologue composition and similar crystal packing. However, further reactions of 1 and 2 wit…
AIM: Production of L-lactic acid in solid-state fermentation (SSF) using polyurethane foam (PUF) as inert support moistened with cassava bagasse starch hydrolysate. METHODS AND RESULTS: PUF impregnated with cassava bagasse starch hydrolysate as major carbon source was used for the production of L-lactic acid using Lac…
The authors investigated the polymer-mediated colloidal interactions in a good solvent wherein the particle size varies from that much smaller than the polymer radius of gyration up to macroscopic and the polymer concentration varies from that corresponding to a dilute solution to that close to a melt. At conditions d…
We present results from constant pressure molecular-dynamics simulations for a bead-spring model of a crystallizable polymer melt. Our model has two main features, a chemically realistic intrachain rigidity and a purely repulsive interaction between nonbonded monomers. By means of intrachain and interchain structure f…
We show that the intrinsic spin orbit interaction in a single plane of graphene converts the ideal two dimensional semi metallic groundstate of graphene into a quantum spin Hall (QSH) state. This novel electronic phase shares many similarities with the quantum Hall effect. It has a bulk excitation gap, but supports th…
Abstract A numerical simulation of melt spinning reveals bifurcation of dynamic solutions leading to limited spinning conditions. The bifurcation phenomenon is controlled by stress‐oriented crystallization and crystallinity‐dependent polymer viscosity. Under the conditions of bifurcation, the space of the spinning con…
Two-dimensional electrons in graphene are known to behave as massless fermions with Dirac-Weyl type linear dispersion near the Dirac crossing points. We have investigated the collective excitations of this system in the presence or absence of an external magnetic field. Unlike in the conventional two-dimensional elect…
We report on a systematic neutron powder diffraction (NPD) study of polycrystalline La(7/8)Sr(1/8)Mn(1-γ)O(3+δ) compounds. We investigated the structural and magnetic phases and transitions in the temperature range between 10 and 900 K for two different samples: an Ar-annealed sample with an orthorhombic Pbnm (Z = 4;…
Abstract The first principles calculations by using the plane‐wave pseudopotential method in the scheme of density functional theory were performed for polymorphs of ZnO: wurzite‐, zinc‐blende‐, rocksalt‐structures, and yet experimentally undiscovered CsCl‐structure. The elastic behavior and the stability of the struc…
Abstract Boehmite particles modified with organic ligands were prepared through the reaction of boehmite with acrylic acid or diethylphosphoric acid (formed in situ from triethyl phosphate). The chemical structures of these particles were determined, and it was shown that they formed stable aqueous dispersions with a…
Abstract Polyaniline (PAni) grafted nano silica were synthesized successfully by in situ polymerization of aniline (An) using ammonium persulphate (APS) as oxidant by three procedures: Firstly, γ‐(2,3‐epoxypropoxy)propyltrimethoxysilane (EPTMS) reacted with nano silica. Secondly, the EPTMS modified nano silica reacted…
We report the complete set of elastic constants and the bulk modulus for single-crystal $\mathrm{Pb}({\mathrm{Mg}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}$ (PMN) at room temperature obtained from Brillouin spectroscopy and molecular-dynamics (MD) simulations. The bulk modulus from Brillouin spectroscopy is found to…
Abstract Several new polyurethane networks based on hyperbranched polyesters (trade name Boltorn) were synthesized to investigate the influence of the hyperbranched crosslinking agent on the molecular dynamics of the linear segments containing urethane groups. For comparison, linear polyurethanes as well as polyuretha…
BACKGROUND: In microorganisms and plants, the first two reactions of arginine biosynthesis are catalyzed by N-acetylglutamate synthase (NAGS) and N-acetylglutamate kinase (NAGK). In mammals, NAGS produces an essential activator of carbamylphosphate synthetase I, the first enzyme of the urea cycle, and no functional NA…