Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Well-defined graft copolymers with polyisoprene backbones and polystyrene branches, having trifunctional branch points, of the type S 2 IS 2 (H-shaped) and (SI)I(SI) (π-shaped) were synthesized by anionic polymerization high-vacuum techniques. The synthetic strategy involves the preparation of the outer parts of the m…
Dornoic acid (DA) production by Pseudo-nitzschia multiseries (Hasle) was studied at various silicate concentrations and under silicate perturbation. Both slowly dividing and non-dividing pop-ulation~ produced DA, and the production rates were inversely correlated with the ambient silicate concentrations. Production of…
A two-step, generally applicable synthetic approach for NLO side-chain aromatic polyimides was developed. This is a one-pot preparation of a preimidized, hydroxyl polyimide, followed by the covalent bonding of a chromophore onto the backbone of the polyimide via a mild post-Mitsunobu reaction. NLO side-chain aromatic…
The interlayer aluminol surface of kaolinite has been modified by the reaction of methanol, at temperatures between 200 and 270 °C, with both the dimethyl sulfoside intercalate of kaolinite (Kao–DMSO) and the N-methylformamide intercalate of kaolinite (Kao-NMF). The product was a methoxy-functionalized organomineral m…
In order for boron neutron capture therapy (BNCT) to be successful, a large number (approximately 10(9)) of 10B atoms must be delivered to each cancer cell in order to sustain a lethal 10B(n, alpha)7Li reaction. The majority of high grade gliomas express an amplified epidermal growth factor receptor (EGFR) gene, and i…
Surface structure, obtained from atomic force microscopy and X-ray reflectivity, and surface chemical analysis data, obtained from X-ray photoelectron and static secondary ion mass spectroscopy, are reported for blends of poly( p -bromostyrene) with poly(deuteriostyrene). When high speeds are used in the spin-coating…
The relationship between the fracture toughness ( G c ) and the areal density of diblock copolymer at the interface (Σ) was investigated for joints between polypropylene (PP) and polyamide-6 (PA6), two incompatible, semicrystalline polymers. Diblock copolymers were formed in situ by reaction between succinic acid grou…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSuperconductivity at 5.2 K in an Electron Donor Radical Salt of Bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) with the Novel Polyfluorinated Organic Anion SF5CH2CF2SO3-Urs Geiser, John A. Schlueter, H. Hau Wang, Aravinda M. Kini, Jack M. Williams, Paul P. Sche, Hali…
In order to study the effect of organic surface chemistry on calcite nucleation, attachment, and growth, calcium carbonate was precipitated in the presence of various ultrathin-film organosilane-modified silicon wafers. The chemistry of the aminosilane surfaces was systematically changed by the coupling of various aci…
A bicapped, highly reduced vanadylpolymolybdophosphate Keggin complex [(C2H5)3NH]5[PMoV6MoVI6O40(VIVO)2], (TEA) 1, has been prepared hydrothermally and characterized by single-crystal X-ray diffraction, IR, UV/visible, cyclic voltammetry, elemental analysis, redox titration, and 51V and 31P NMR on its degradation prod…
The syntheses of 3,4- and 4,5-diiodophthalonitriles are described. Coupling of the latter compound with Pd(PPh(3))(2)Cl(2) and 1-octyne, 1-heptyne, 1-hexyne, 1-pentyne, and 3,3-dimethyl-1-butyne gave a series of 4,5-dialkynylphthalonitriles. Hydrogenation of 4,5-bis(1-pentynyl)phthalonitrile and 4,5-bis(3,3-dimethyl-1…
Three compounds with formula [Mn(L)(2)(N(3))(2)](n)(), in which L is 4-acpy = 4-acetylpyridine (1), Etinc = ethyl isonicotinate (2), and py = pyridine (3), have been studied from the magnetic point of view. The new compound [Mn(L)(2)(N(3))(2)](n)() (2) crystallizes in the monoclinic system, space group P2(1)/a (No. 14…
The synthesis of low molecular weight (M n (NMR) < 7000 g/mol) lactic acid prepolymers by condensation polymerization of l -lactic acid was investigated. Besides the l -lactic acid polymer, hydroxyl- and carboxyl-terminated telechelic prepolymers were also prepared by the addition of small amounts of 1,4-butanediol an…
Effects of macroscopic residual stresses on fracture toughness of multilayered ceramic laminates were studied analytically and experimentally. Stress intensities for edge cracks in three‐layer, single‐edge‐notch‐bend (SENB) specimens with stepwise varying residual stresses in the absence of the crack and superimposed…
Diblock copolymers order into a variety of periodic morphologies when the constituent blocks are sufficiently incompatible. Previous studies have demonstrated that classical dispersion (spherical and cylindrical) and lamellar morphologies, as well as complex morphologies ( e.g., gyroid*, lamellar catenoid, and hexagon…
Titania coatings ranging from sub-monolayer to ≈7 nm thick have been deposited on silica by hydrolysis of titanium alkoxide precursors. Nonporous model silica particles of spherical shape were used as the support for titania. The ratio of titanium alkoxide to water and the dilution of the reactant mixture in ethanol c…
4-Nitrophenyl 4-[[2-[(2-methyl-1-oxo-2-propenyl)oxy]ethyl]oxy]benzoate (BEM) was synthesized and copolymerized with 4‘-[[[2-[(2-methyl-1-oxo-2-propenyl)oxy]ethyl]ethyl]amino]-4-nitroazobenzene (DR1M) in dioxane at 60 °C. BEM and DR1M copolymerize in a random fashion with reactivity ratios r DR1M = 0.82 and r BEM = 1.0…
We have observed what appears to be a first-order phase change from deeply supercooled liquid triphenyl phosphite at 1 atm to a rigid, “apparently” amorphous phase which we denote as the “glacial phase”. This is a new, crisper, and rather different addition to the examples of polyamorphism that have recently been stud…
Al-free Ti-β zeolite spontaneously nucleates and grows in a reaction mixture containing tetraethylammonium and fluoride ions at near neutral pH, and shows an enhanced crystallinity and thermal and hydrothermal stability as well as a significant hydrophobic character.
We use self-consistent mean field methods and analytical theory to determine the behavior of AB copolymers at the interface between two incompatible homopolymers, A and B. We calculate the reduction in interfacial tension, γ, resulting from the copolymers localizing at the A/B interface. We examine the effects of chai…