Materials Literature
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Considering the possibility of liquid crystalline (LC) polymers at first, they seem to be difficult to achieve, because polymer chains usually adopt a statistical coil conformation, whereas LC-phases possess an orientational and/or a positional long-range order. Nevertheless, polymer chains can be combined with liquid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmino acid complexes of palladium(II). 1. NMR study of the reactions of the diaqua(ethylenediamine)palladium(II) cation with ammonia, betaine, and the amino acids +NH3(CH2)nCO2- (n = 1-3)Trevor G. Appleton, Alicia J. Bailey, Danny R. Bedgood Jr., and John R. HallCite this: I…
Abstract Ge 1– x Si x crystals were grown with the Bridgman and the Czochralski method over a wide concentration range. With the Bridgman process single crystals up to 40 at.% Si were possible. The reasons for polycrystalline growth were the permanent contact of the interface with the crucible wall in combination with…
In connection with a study of the fiber reinforcement of wood, a number of silane coupling agents were evaluated in the bonding of basalt fibers to phenolic and isocyanate resins most commonly used in wood bonding. Interfacial shear strength improvement before and after 1 h boiling in water was determined, utilizing a…
Methods have been developed for covalently linking [Mn4O2(O2CPh)6(dbm)2]2(dbmH = dibenzoylmethane) units to give a dimer and a polymer; treatment of 2 with trans-1,2-bis(4-pyridyl)ethene (bpe) or 4,4′-bipyridine (4,4′-bpy) yields [Mn4O2(O2CPh)6(dbm)2(bpe)]24 and [Mn4O2(O2CPh)6(dbm)2(4,4′-bpy)]n5, respectively.
ADVERTISEMENT RETURN TO ISSUEArticleNEXTStructural Distortion of CH3I in an Ion-Dipole Precursor ComplexWei Ping Hu and Donald G. TruhlarCite this: J. Phys. Chem. 1994, 98, 4, 1049–1052Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs.acs…
The Peierls stress is calculated for a discrete Peierls—Nabarro model of a dislocation. Unlike the original continuum model where a continuous distribution of infinitesimal dislocations was considered, the discreteness of the slip plane is maintained throughout the calculation, and the Peierls stress τp is determined…
There is ample evidence in the literature of the effects of reactor irradiation on the microstructure and corrosion behavior of zirconium alloys. Specifically, it has been shown that boiling water reactor (BWR) irradiation generally induces nodular corrosion and causes marked changes in precipitate structure and compo…
The properties of rare-earth-containing oxynitride glasses in the Ln-Si-Al-O-N systems (Ln=Dy, Er, Gd, La, Nd, Sm, Y, Yb) were investigated and the following results were obtained.(1) The glass transition temperature and the softening temperature in these glasses are in a range of 915-950°C and 960-1020°C, respectivel…
Observations of the photoredox reactivity of antimony(III) porphyrin complexes are reported. Upon irradiation with visible light under ambient conditions, a photooxidation to the corresponding dihydroxoantimony(V) porphyrins occurs. At the same time a two-electron or four-electron reduction of molecular oxygen takes p…
This paper discusses the characteristics of noise sources in Al-based thin films and their relationships to VLSI reliability. Techniques of applying noise measurements in detecting existing defects/damages in the films, determining electromigration activation energy, and predicting the time to failure of VLSI intercon…
The bond-fluctuation model of polymer chains has been used to study layers of end-grafted polymers anchoring at repulsive walls for a broad range of chain length, grafting densities and solvent quality. The dynamics of monomers and associated relaxation times are investigated and interpreted by phenomenological theori…
The motion of a single bubble is simulated directly using the full conservation equations for mass, momentum and energy when the surrounding pressure increases stepwise. The numerical results for several cases reveal that considerable distributions of temperature and concentration of vapor are formed inside the bubble…
The results of the characterization of plasma-treated polypropylene (PP) and polymethylmethacrylate (PMMA) by X-ray photoelectron spectroscopic, atomic force microscopic (AFM), and surface resistivity measurements are presented. Chemical, physical, and morphological modifications of the polymer surface were investigat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSol-gel synthesis of a siloxypolycarbosilane gel and its pyrolytic conversion to silicon oxycarbideFlorence Babonneau, Laurence Bois, Chia Yu Yang, and Leonard V. InterranteCite this: Chem. Mater. 1994, 6, 1, 51–57Publication Date (Print):January 1, 1994Publication History P…
ZrO2 coatings deposited on 316 L stainless steel sheets were synthesized by sol-gel method using Zr(OC3H7)4 as precursor and isopropanol, glacial acetic acid, and water as solvents for application with ultrasounds. Different solutions for dip-coating were prepared with compositions varying between 0.025 and 0.9 mol/dm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline aromatic polyesters containing isophthalic acidRubing Cai and Edward T. SamulskiCite this: Macromolecules 1994, 27, 1, 135–140Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs…
12 meltable substances were studied with respect to their ability to form prolonged release pellets in a melt pelletization process using a laboratory scale high shear mixer. It was found that few substances were able to pelletize a formulation with 12.5% m/m paracetamol and 87.5% m/m calcium hydrogen phosphate. Favou…
Surface modifications produced by treatments (mainly halogenation) of synthetic vulcanized styrene-butadiene rubber (SBR) leading to increased adhesion properties with polyurethane adhesives have been studied. T-peel tests, scanning electron microscopy (SEM), advancing contact angle measurements, infra-red (IR) spectr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControl of Excimer Emission and Photochemistry of Stilbene Units by Oligonucleotide HybridizationRobert L. Letsinger and Taifeng WuCite this: J. Am. Chem. Soc. 1994, 116, 2, 811–812Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Publishe…