Materials Literature
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The incorporation of titanium oxide into the interlayers of a myristic acid exchanged lithium aluminum layered double hydroxide was done by partitioning of titanium butoxide into the interlayer, followed by hydrolysis under ambient conditions. Upon excitation with near-ultraviolet radiation in the presence of viologen…
We studied the high temperature decomposition mechanism for the Fe/sub 17/Sm/sub 2/N phase using several different experimental techniques, as thermomagnetic and thermogravimetric analyses. Our results show that the decomposition occurs in a two step scheme. In the first reaction we hare the formation of SmN and a sol…
Bisphenol A polycarbonate (PC) and PET/0.6PHB polymer liquid crystal (PLC), where PET is poly(ethylene terephthalate), PHB is p -hydroxybenzoic acid, and 0.6 is the mole fraction of PHB in the copolymer, were studied along with their blends from the PC side up to 20 wt % PLC. Dielectric relaxation in the range 10 -2 −…
The fracture toughness of Zircaloy-2 cladding has been estimated by means of the recently developed pin-loading (PL) tension test. Axially notched ring specimens, cut directly from different cladding (annealed, cold-worked, hydrided, and irradiated), have been tested in a way similar to that used for compact tension s…
The effect of continuous-wave ultrasound on the viability of Escherichia coli HB101 was assessed using a 20 kHz ultrasonic processor. A standardised cell suspension of fixed concentration was used to investigate the influence of different physical and environmental conditions on ultrasound susceptibility. Cell viabili…
Block copolymers of the ABA type, where B is polybutadiene (PBD) and A is poly(ethyl methacrylate) (PEMA), poly( tert -butyl methacrylate) (P-t-BMA), poly(methyl methacrylate) (PMMA), or poly(isobornyl methacrylate) (PIBMA), have been successfully synthesized by sequential anionic polymerization of butadiene and metha…
Abstract Polyacrylamide‐starch composite was prepared by polymerization of maize or rice starch with acrylamide (Aam) using potassium permangante/citric acid initiation system. Major factors affecting the polymerization reaction were studied with a view to discover appropriate conditions for preparation of the composi…
Treatment of 4-acetylstyrene (an AB 2 monomer) with dihydridocarbonyltris(triphenylphosphine)ruthenium leads to hyperbranched poly(4-acetylstyrene) whose structure has been determined by 1 H and 13 C NMR spectroscopy. The hyperbranched material has been characterized by GPC, IR, UV, TGA, DSC, and elemental analysis. P…
A series of new FePS 3 layered intercalation compounds having the general formula Fe 1 - x PS 3 G 2 x (where G stands for a monocation) has been prepared by cation exchange with several pyridinium derivatives. The occurrence of intralayer Fe 2+ vacancies is evidenced by 57 Fe Mössbauer spectroscopy. The magnetic prope…
The goal of this work was to synthesize new molecular bricks which could be used as precursors of heterobimetallic low-dimensional compounds. Along this line, four compounds have been synthesized and structurally characterized, namely (NBu(4))(2)[Ni(Cl(2)opba)] (1), (NBu(4))(2)[Cu(Cl(2)opba)] (2), (NBu(4))(5)[Mn(Cl(2)…
Annealed interfaces between high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polypropylene (PP) and some ethylene- co -vinyl acetate (EVA) and ethylene- co -acrylic acid (EAA) copolymers were examined using optical microscopy, scanning electron microscopy (SEM), and electron microprobe analysis.…
The pressure-induced iron(II) high-spin (HS) → low-spin (LS) conversion has been investigated, by near-edge X-ray absorption (XANES) spectroscopy at room temperature, in a number of parent six-coordinate complexes of the type FeL n L‘ m (NCS) 2, viz. Fe(phen) 2 (NCS) 2 form I ( 1 ) and form II ( 2 ), Fe(py) 2 bpym(NCS…
Abstract A new type of inorganic‐organic composite has been developed using organic monomeric or polymerizable silanes (with appropriate organic groupings like double bonds or epoxides) as monomers or in situ prepared or separately added nano‐scale ceramic or metal particles. Due to the small size of the particulate p…
A method for the preparation of poly(aryl ether benzimidazoles) has been developed where the generation of an ether linkage is the polymer-forming reaction. We found that 2-(4-fluorophenyl)benzimidazoles were activated toward nucleophilic aromatic substitution with phenoxides. Facile displacement occurred at this posi…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHeterocycle-Activated Aromatic Nucleophilic Substitution of AB2 Poly(aryl ether phenylquinoxaline) Monomers. 3S. Srinivasan, R. Twieg, J. L. Hedrick, and C. J. HawkerView Author Information IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 951…
Exposing activated carbons to nitric oxide and oxygen at temperatures between 295 and 400 K leads to the conversion of the NO to NO 2 at the carbon surface and the adsorption of NO 2 . In the current study, the conversion and adsorption kinetics of the NO to NO 2 reaction were examined at total pressures between 1 and…
Carbon–carbon composites are an attractive choice for fusion reactor plasma facing components because of their low atomic number, superior thermal shock resistance, and low neutron activation. Next generation tokamak reactors such as the International Thermonuclear Experimental Reactor (ITER), will require high therma…
We followed the surface imide ring hydrolysis of fully imidized polyimide films by aqueous base solutions using Rutherford backscattering spectrometry. The hydrolysis reaction was studied using several different polyimide films including spuncast and thermally imidized PMDA-ODA, Kapton-H, and Upilex-S films. The bound…
A low pressure drop reactor was prepared by washcoating Cu ion-exchanged mordenite on a honeycomb. The reactor configuration including reaction conditions was experimentally optimized both for low-pressure drop and for high catalytic activity of the honeycomb reactor. Over 90% of NO conversion was achieved by both Cu…
Reversible formation of gold crystallites takes place in methanol-swollen cross-linked polymers of diallyldimethylammonium chloride. Metal particles are generated in air-saturated gels via the photoreduction of Au(III) complexes. Oxidation of the crystallites proceeds through a dark reaction that regenerates the Au(II…