Materials Literature
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The role of an initiator (perfluorooctane sulfonyl fluoride, PFOSF) in the polymerization of 1,3,5-trivinyl-1,3,5-trimethylcyclotrisiloxane (V 3 D 3 ) by hot-filament chemical vapor deposition has been demonstrated. Use of the initiator allows rapid deposition of films at significantly lower filament temperatures. Pol…
Hybrid materials constituted by polypyrrole doped with the polyoxometalate (POM) anion [SiCr(H 2 O)W 11 O 39 ] 5- were electrogenerated from acetonitrile solutions. The electrochemical behavior of the hybrid films was studied by cyclic voltammetry in three different electrolytes formed by two anions and two cations, d…
The compounds N -phenyl-4-(10-methoxy-9-anthracenylethynyl)phthalimide ( 1 ), N -phenyl-4-(4-methoxy-1-naphthylethynyl)phthalimide ( 2 ), and N -phenyl-4-(4-benzonitrileethynyl)phthalimide ( 3 ) were synthesized to probe the effect(s) of electronic subsituents on the thermal curing of aryl−ethynyl end-capped oligomers…
Polytetrafluoroethylene (PTFE) thin films were prepared from pressed powder pellets via pulsed laser deposition by using ArF (193 nm) excimer laser. The applied laser fluences were in the 1.6-10 J cm -2 range, the substrate temperature was varied between 27°C and 250°C and post-annealing of the films was carried out i…
Stress relaxation dynamics in a series of star/linear 1,4-polybutadiene blends with fixed star-arm molecular weight M a, variable linear polymer molecular weight M L, and variable star polymer volume fraction φ s are investigated. Storage and loss moduli, G ‘(ω) and G ‘ ‘(ω), obtained from small amplitude oscillatory…
This paper presents a general method for fitting interatomic potentials to partial pair correlation functions that can be obtained from diffraction experiments on pure materials or alloys. We apply this new approach to the specific case of embedded atom method-type interatomic potentials and demonstrate that it can be…
The relationship between the breakdown electric field E B (electric field corresponding to the current density 1 mA cm -2 ) and thickness d for three types of Zinc oxide (ZnO) varistors were investigated. The geometric dimensional effect, observed in these varistors, is referred to as the responsible parameter for the…
Gels of syndiotactic polystyrene with different solvents have been compared to clathrates. Wide-angle X-ray diffraction results using toluene (good solvent for sPS) and decalin (relatively poor solvent for sPS) show that the structure of the crystalline junctions of the gels is similar to that of the clathrate δ-phase…
Abstract The aim of this research was to explore the effect of shear‐controlled orientation injection molding (SCORIM) on polybutene‐1 (PB‐1). This article describes the methods and processing conditions used for injection molding and discusses the properties of the moldings. Both conventional and SCORIM have been use…
Vanadium-substituted mesoporous molecular sieves (MCM-41) were prepared and the effects of water concentration, anti-foaming agent addition, pH adjustment, and Si/surfactant mole ratio were investigated. The hydrothermal and mechanical stability were tested for the pH-adjusted sample (Si/surfactant = 3.67 and 7.34). C…
Electron spin resonance (ESR) measurements were performed on nitrogen-free diamond films grown by chemical vapor deposition and on diamond single crystals, irradiated by ${}^{17}\mathrm{O}$ ions and annealed in the temperature range $100--1400\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}.$ For those annealed in the ra…
An amorphous $2\mathrm{CdO}\ensuremath{\cdot}{\mathrm{GeO}}_{2}$ thin film with a band gap of 3.4 eV can be converted from an insulator (conductivity $\ensuremath{\sim}{10}^{\ensuremath{-}9}{\mathrm{S}\mathrm{}\mathrm{cm}}^{\ensuremath{-}1})$ into a degenerate semiconductor $(\ensuremath{\sim}{10}^{2}{\mathrm{S}\mathr…
A large number of new liquid crystals incorporating the 2,5-disubstituted thiophene ring have been prepared and their mesomorphic behaviour studied in order to systematically investigate the correlation between the molecular structure and mesomorphism of thiophene derivatives with different shapes, polarisability and…
Thermoplastic vulcanizates (TPVs), as prepared by dynamic vulcanization, are blends in which cross-linked rubber particles are finely dispersed in a thermoplastic matrix. The reported nylon-6/EPDM TPVs show significant strain recovery behavior, even though the matrix consists of semicrystalline nylon-6, which deforms…
Synthesis of a cubic ethane−silica hybrid organic−inorganic mesoporous material using a binary surfactant mixture is reported. The system consists of ethane-bridged organosilica (BTME), polyoxyethylene alkyl ether [C 12 (EO) 4; Brij 30], and the octadecyltrimethylammonium chloride (C 18 TMACl) surfactants in a basic m…
The use of a quinone functionality in the linkage unit of laterally bridged oligoporphyrins as a switch for controlling electronic coupling between the termini is examined. The quinone-bridged bisporphyrin P(2)TA-O(2) was synthesized by condensation of 2 equiv of the dione 2,3-dioxo-5,10,15,20-tetrakis(3,5-di-tert-but…
A polyalkynylene-based conducting polymer (molecular wire) has been synthesized within the Cu-functionalized mesoporous MCM-41 silica catalyst. Fluorescence and 13C solid-state NMR provided spectroscopic evidence that the synthesis of extended polymeric chains with a high degree of alignment requires homogeneously dis…
Gold clusters on the surface of MgO powder (calcined at 673 K) were prepared from adsorbed [Au(CH 3 ) 2 (acac), where acac is C 5 H 7 O 2 ] and characterized by extended X-ray absorption fine structure (EXAFS) spectroscopy and X-ray absorption near edge spectroscopy (XANES). One sample initially contained gold predomi…
Electron conduction through quasi-one-dimensional (1D) indium atomic wires on silicon (the Si(111)-4x1-In reconstruction) is clarified with the help of local structural analysis using scanning tunneling microscopy. The reconstruction has a conductance per square as high as 100 uS, with global conduction despite numero…
We study the extreme long-time behavior of the metastable phase of the three-dimensional Ising model with Glauber dynamics in an applied magnetic field and at a temperature below the critical temperature. For these simulations we use the advanced simulation method of projective dynamics. The algorithm is described in…