Materials Literature
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The phase morphology of PC/ABS blends can be significantly affected by its processing conditions. Blends prepared in a mixing chamber at different conditions show a strong influence of mixing time and temperature on its morphology. The blend morphology changes from a well-dispersed PC phase surrounded by the ABS matri…
The geometry of crambin, a protein with 46 residues, was determined by ab initio HF/4-21G geometry optimization. The results are compared with the crystal structure of the compound and with HF/4-21G φ,ψ-conformational geometry maps calculated for the model dipeptide N -acetyl- N ‘-methylalaninamide. Root-mean-square (…
Abstract
The molecular orientation at the surface of polyimide (PI) alignment layers used for liquid crystal displays has been determined using X-ray absorption spectroscopy (NEXAFS). The second moments of the orientation distribution function obtained from a detailed analysis reveal that, upon rubbing, the PI substrates devel…
The adhesion strength of various photosensitive epoxies with copper or FR4 substrate was measured by the stud pull testing method. The adhesion strength was around 35–60 kg/cm2 for photosensitive epoxy/copper laminate and 60–105 kg/cm2 for photosensitive epoxy/FR-4 laminate. A high adhesion strength of metal/photosens…
Abstract
The crystal structures of inorganic compounds comprising cationic complexes containing oxygen atoms coordinated tetrahedrally to metal atoms, or oxocentred groups [OM4], are considered. The linking of the [OM4] tetrahedra in the structures has been analysed and cationic complexes of different structures have been iden…
Hyperbranched dendritic polyamine consisting of primary, secondary (a nonbranching junction), and tertiary (a branching junction) amino moieties was produced by Pd-catalyzed decarboxylative ring-opening polymerization of 5-methyleneperhydro-1,3-oxazin-2-one ( 2 ) at 25 °C with the aid of benzylamine as the initiator.…
Basic advances and prospects of further research in the field of the chemistry of nanoparticles are considered. The principal factors determining the unusual physicochemical properties of semiconductor nanoparticles are discussed. It is pointed out that the kinetics of chemical transformations on the surface and in th…
The mechanical properties and morphology of polypropylene/wood flour (PP/WF) composites with different impact modifiers and maleated polypropylene (MAPP) as a compatibilizer have been studied. Two different ethylene/propylene/diene terpolymers (EPDM) and one maleated styrene–ethylene/butylene–styrene triblock copolyme…
The adsorption of methyl radicals has been studied by X-ray photoelectron spectroscopy and temperature-programmed desorption (TPD) on a clean Ni(100) surface, Ni(100) with a chemisorbed oxygen overlayer, and Ni(100) with a NiO(111) oxide overlayer. Methyl radical dosing at surface temperatures of 120−170 K produces ca…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDifferential Scanning Calorimetry Evidence for the Existence of a First-Order Thermal Transition in Ultraoriented at-Poly(acrylonitrile)Daisuke Sawai, Tetsuo Kanamoto, and Roger S. PorterView Author Information Department of Applied…
The crystal structure of yeast thymidylate kinase (TmpK) complexed with the bisubstrate inhibitor P1-(5'-adenosyl) P5-(5'-thymidyl) pentaphosphate (TP5A) was determined at 2.0 A resolution. In this complex, TmpK adopts a closed conformation with a region (LID) of the protein closing upon the substrate and forming a he…
The hydrolytic depolymerization of poly(ethylene terephthalate) (PET) was carried out in a stirred batch reactor at 235, 250, and 265 °C above its melting point and under autogenous pressure. The solid products which were mainly composed of terephthalic acid were analyzed by potentiometric titration and elemental anal…
A systematic study on the effect of various substituents at the 7- and/or 8-position on the redox properties of isoalloxazines (flavins) is reported. The redox properties of these flavin derivatives were studied by cyclic voltammetry in 100 mM, pH 7.4 HEPES and 200 mM, pH 10 borate buffers. The magnitude and direction…
Calmodulin (CaM) is an essential protein that exerts exquisite spatial and temporal control over diverse eukaryotic processes. Although the two half-molecule domains of CaM each have two EF-hands and bind two calcium ions cooperatively, they have distinct roles in activation of some targets. Interdomain interactions m…
A medium described by an imaginary potential (or imaginary (refractive index) ), that varies sinusoidally in one direction, acts as a volume grating for plane waves incident on it obliquely or normally. Two peculiar features are identified. First, if the potential is weak, so that there are only two significant diffra…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHeterogeneous Oxidation of Allylic and Benzylic Alcohols Catalyzed by Ru−Al−Mg Hydrotalcites in the Presence of Molecular OxygenKiyotomi Kaneda, Toyokazu Yamashita, Tsuyoshi Matsushita, and Kohki EbitaniView Author Information Department of Chemical Science and Enginee…
Reactions of VCl 3 (THF) 3, bpy, and NaO 2 CR (R = Et, Ph; bpy = 2,2‘-bipyridine) in a 1:1:3 ratio in Me 2 CO give [V 4 O 2 (O 2 CR) 7 (bpy) 2 ](ClO 4 ) (R = Et, 1; R = Ph, 4 ) following addition of NBu n 4 ClO 4 . Use of 4,4‘-dimethyl- or 5,5‘-dimethylbipyridine (4,4‘-Me 2 bpy and 5,5‘-Me 2 bpy, respectively) and R =…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTElectropolymerization of Acenaphtho[1,2-k]fluoranthene Derivatives: Formation of a New Conductive Electroactive Electrochromic Hydrocarbon Ladder PolymerJeff D. Debad and Allen J. BardView Author Information Department of Chemistry and Biochemistry The University of Te…