Materials Literature
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Abstract Liquid crystalline polymer reinforced plastics were prepared by compounding (PHB/PEN/PET) blends. A fibrillar PHB structure was formed in situ in the PEN/PET matrix under a high elongational flow field during melt‐spinning of the composite fibers. The formation of PHB microfibrils in the composite fiber with…
Abstract Poly( n ‐butyl methacrylate) (PBMA)–polyaniline (PANI) composite films were obtained by extrusion by use of two methods: the first method consisted of polymerizing a thin layer of PANI, with Cl − as dopant, on the extruded film of PBMA; the second method was based on blends of PBMA and PANI produced by the ex…
Syntheses of buergerinin F (1) and buergerinin G (2) were carried out to establish the absolute stereochemistry of these natural products. A linear sequence was used to synthesize 1 in 15 steps and 9% overall yield from thymidine. Subsequent oxidation of 1 with ruthenium tetroxide afforded 2 in 77% yield.
Magnetic thin films composed of hexacyanochromate-based magnets, MII1.5[CrIII(CN)6].ZH2O (M = Co, Ni, Cu), were prepared on a transparent Nafion membrane by an ion-exchange process and their Faraday spectra were observed in the visible region.
The Pr 0.5 Ca 0.5 Mn 1− x Cr x O 3 series has been investigated up to x = 0.5. For low doping content ( x ≤ 0.04), the introduction of Cr 3+ favours the creation of ferromagnetic (FM) regions leading to phase-separation phenomena. Steps in the magnetic and transport properties measured versus field are observed and th…
Abstract The effects of styrene content, layer thickness, and temperature on the adhesion of ethylene–styrene copolymers (ES) to low‐density polyethylene (LDPE) were examined by measuring the delamination toughness of LDPE/ES microlayers in the T‐peel test. Delamination toughness at ambient temperature decreased with…
Abstract The quantum chemical tool crystal orbital Hamilton population (COHP) has been used for the analysis of bonding within metallic systems to predict the tendency for ferromagnetic and antiferromagnetic order. In these materials, the preference of bonding interactions and avoidance of antibonding interactions is…
We have performed classical molecular-dynamics simulations of the fragmentation collisions of neutral fullerenes $({\mathrm{C}}_{24},$ ${\mathrm{C}}_{60},$ ${\mathrm{C}}_{100},$ and ${\mathrm{C}}_{240})$ with a hard wall. The interactions between the carbon atoms are modeled by a Tersoff potential and the position of…
Abstract Irradiation of thin films of poly(ferrocenylmethylphenylsilane) ([Fe( η 5 ‐C 5 H 4 ) 2 SiMePh] n ) cast from chloroform solution with UV light leads to photooxidation of ferrocene centers in the polymer main chain. The extent of the polymer oxidation can be controlled in the range ca. 0–5% by the duration of…
Thermoresponsive nanocomposite thin films composed of alternating layers of silica and polymerized N-isopropylacrylamide (NIPAM) or NIPAM plus dodecyl methacrylate (DM) hydrogels were prepared by surfactant-directed evaporation-induced self-assembly (EISA). During EISA, the organic monomers partition within the hydrop…
First-principles molecular dynamics and quantum Monte Carlo techniques are employed to gain insight into the effect of preparation conditions on the structural and optical properties of silicon nanoparticles. Our results demonstrate that (i) kinetically limited nanostructures form different core structures than bulk-d…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTInfluence of Cross-Link Density on the Thermal Properties of Thin Polymer Network FilmsJoseph L. Lenhart and Wen-li WuView Author Information Sandia National Laboratories, P.O. Box 5800, MS 1411, Albuquerque, New Mexico 87185, and Polymers Division, National Institute of Standa…
In order to investigate the relationship between the crystal structure and electronic properties, crystal structure analysis of the organic superconductor $\ensuremath{\alpha}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}{\mathrm{NH}}_{4}\mathrm{Hg}(\mathrm{SCN}{)}_{4},$ where BEDT-TTF is the abbreviati…
Abstract Comprehensive modeling studies were used to describe the kinetics of the solid‐state polymerization (SSP) of poly(ethylene terephthalate). The validity of the model was confirmed by the successful fitting of the experimental results for molecular weight increases, at temperatures ranging from 180 to 230°C and…
Abstract The effect of filler loading on the cure time ( t 90 ) and swelling behaviour of SMR L/ENR 25 and SMR L/SBR blends has been studied. Carbon black (N330), silica (Vulcasil C) and calcium carbonate were used as fillers and the loading range was from 0 to 40 phr. Results show that for SMR L/ENR 25 blends the cur…
We present a method for calculating the inverse of the dielectric matrix in a solid using a band Lanczos algorithm. The method produces a multi-pole approximation for the inverse dielectric matrix with an arbitrary number of poles. We discuss how this approximation can be used to calculate the screened Coulomb interac…
SrF 2 and BaF 2 crystals, doped with the Yb 3+ ions, have been investigated by electron paramagnetic resonance and optical spectroscopy. As-grown crystals of SrF 2 and BaF 2 show the two paramagnetic centres for the cubic (T c ) and trigonal (T 4 ) symmetries of the Yb 3+ ions. Empirical diagrams of the energy levels…
We have used a new method to fabricate photochromic Langmuir–Blodgett (LB) films from a pure azobenzene derivative. The films are used to photoregulate nematic liquid crystals in the host–guest cell (LCD cell). We have demonstrated that the photoresponsiveness of the LCD cell is well determined by phototriggering the…
We present a model for interacting polar-polarizable molecules. Exotic collective effects are recognized as being due to supramolecular interactions: in attractive lattices, bistable behavior is found, and, for proper molecular orientation, multielectron transfer represents the primary photoexcitation event.
Abstract Surface treatment using alkaline solutions was attempted to enhance the surface hydrophilicity and enzymatic hydrolyzability of hydrophobic poly( L ‐lactide) [ie poly( L ‐lactic acid) (PLLA) and poly(ε‐caprolactone) (PCL). The alkaline treatment was performed by immersing the PLLA and PCL films in 0.01 and 4…