Materials Literature
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Abstract Solid state C-13 NMR has been used to compare the chemistry of accelerated vulcanization of natural rubber using N- t -butyl-2-benzothiazole sulfenamide in the presence and absence of carbon black. The carbon black filler has an influence on the vulcanization chemistry in addition to its accepted role in rein…
The scattering from crystals has two components, Bragg and diffuse. In the case of disordered crystalline materials, or those at high temperature, the latter contribution is considerable and contains a great deal of information about any static or thermal disorder in the system. However, interpretation of this diffuse…
Most electrooptic effects in liquid crystals require a uniform orientation of the director at the glass substrates. A new method to produce suitable alignment layers is based on the creation of anisotropic polymer films by photopolymerization with linearly polarized light. In the present paper we report on measurement…
The formation mechanism of the “grain core-grain shell” structure was investigated for the BaTiO 3 -Nb 2 O 5 -Co 3 O 4 ternary system with two different Nb/Co ratios, in terms of sintering characteristics. The temperature dependence of the dielectric constant, the densification behavior and the grain growth rate were…
Structural free volumes in the stable quasicrystalline decagonal and adjacent crystalline phases in the Al-Ni-Co, Al-Cu-Co, and Al-Ni-Fe alloy systems were studied by means of positron lifetime measurements. The comparison of different phases and different alloy systems enables an unambiguous assessment of the positro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmphidinolides O and P, novel 15-membered macrolides from the dinoflagellate Amphidinium sp.: Analysis of the relative stereochemistry and stable solution conformationMasami Ishibashi, Miho Takahashi, and Jun'ichi KobayashiCite this: J. Org. Chem. 1995, 60, 19, 6062–6066Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge-Carrier Evolution in Electrically Conducting Substituted Polymers Containing Biheterocycle/p-Phenylene Repeat UnitsAndrew D. Child, Balasubramanian Sankaran, Fernando Larmat, and John R. ReynoldsCite this: Macromolecules 1995, 28, 19, 6571–6578Publication Date (Print)…
Trivalent europium‐activated yttrium oxysulfide phosphor material prepared by a sulfide fusion method is the primary red material used extensively in color television (CTV) screens. Applying the heterogeneous nucleation theory, we discuss some new results obtained on the formation process of the yttrium oxysulfide sys…
Abstract EuCu 2 As 2 (a = 4,215(1) Å, c = 10,185(2) Å) und EuCu 2 Sb 2 (a = 4,504(1) Å, c = 10,824(2) Å) wurden durch Erhitzen entsprechender Gemenge aus CuCl und Arsen bzw. Antimon mit Europium auf ca. 900°C dargestellt und mit verd. Essigsäure von den Nebenprodukten befreit. Das Arsenid kristallisiert im ThCr 2 Si 2…
Electrochromic manganese oxide thin films were prepared by chemical vapor deposition. The source material was manganese (III) acetylacetonate. Transparent thin films were obtained at a substrate temperature above 250°C. Oxidation and reduction of the films in a propylene carbonate solution resulted in desirable change…
Abstract The crosslinking of ferroelectric liquid‐crystalline (LC) polysiloxanes — performed within the region of microphase separation — allows the preparation of LC‐elastomers which combine macroscopic form stability (insolubility) with nearly unchanged switching time (compared to the uncrosslinked polymers).
The operation of optical narrowband reflection filters based on resonance anomalies of waveguide gratings is well established for gratings of infinite extent. We investigate the properties of finite-aperture waveguide-grating resonance filters by means of rigorous electromagnetic theory and an approximate model. The r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory for the Phase Behavior of Polyolefin Blends: Application to the Polyethylene/Isotactic Polypropylene BlendJohn J. Rajasekaran, John G. Curro, and J. D. HoneycuttCite this: Macromolecules 1995, 28, 20, 6843–6853Publication Date (Print):September 1, 1995Publication Hist…
Ceramic specimens of the complex perovskite oxide Ba(Fe 1/2 Nb 1/2 )O 3 were fabricated by conventional solid state sintering. Dielectric constants were measured as a function of temperature as well as of frequency. As a result, dielectric constants showed an unusual temperature dependence. Moreover, a large dielectri…
Abstract Incorporation of rick husk ash (RHA) fillers into polypropylene affected some of the thermal properties of polypropylene composites. Addition of the black rice husk ash (BRHA) filler raised the thermal degradation temperature while maintaining the oxidative stability. The thermal degradation temperature of th…
Growth of artificial pits in the Ni/sulfuric acid system was investigated using a microprobe technique for the potential monitoring and pH measurements within the pits, as well as routine electrochemical, solution analysis, and metallographic techniques. The measured data and the observed changes in shape of the pit w…
Abstract Compatibility of natural rubber (NR)/polystyrene (PS) blend is poor and can be enhanced by the addition of a graft copolymer of natural rubber and polystyrene (NR- graft -PS). The effects of homopolymer molecular weight, copolymer molecular weight, copolymer concentration, processing conditions and mode of ad…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShear-Induced Alignment of a Hexagonal Lyotropic Liquid Crystal as Studied by Rheo-NMRMichail Lukaschek, David A. Grabowski, and Claudia SchmidtCite this: Langmuir 1995, 11, 9, 3590–3594Publication Date (Print):September 1, 1995Publication History Published online1 May 2002P…
We have tested the effect of several cations in attempts to crystallize the ligand-bound forms of the leucine/isoleucine/valine-binding protein (LIVBP) (M(r) = 36,700) and leucine-specific binding protein (LBP) (M(r) = 37,000), which act as initial periplasmic receptors for the high-affinity osmotic-shock-sensitive ac…
One of the most commonly overlooked parameters in grain boundary engineering initiatives is solute-interface interactions involving solute concentrations typically in the ppm range. In this work, experimental evidence is presented that demonstrates the significant effect of such interactions upon (1) the specific prop…