Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPalladium-catalyzed reaction of 5-methylene-1,3-dioxolan-2-ones. A new access to and reactivity of oxatrimethylenemethane-palladiumKouichi Ohe, Hideki Matsuda, Toshihisa Ishihara, Sensuke Ogoshi, Naoto Chatani, and Shinji MuraiCite this: J. Org. Chem. 1993, 58, 5, 1173–1177P…
A series of N, N-di-n-alkyl-N,N-dimethylammonium bromides was synthesized and characterized. Its thermotropic liquid-crystalline behaviour was studied by differential scanning calorimetry, polarizing optical microscopy and X-ray diffraction. A novel smectic mesophase was thus identified, in which the lateral packing o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFoam breakdown by hydrophobic particles and nonpolar oilRobert Aveyard, Philip Cooper, Paul D. I. Fletcher, and Christine E. RutherfordCite this: Langmuir 1993, 9, 2, 604–613Publication Date (Print):February 1, 1993Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface chemistry of boron oxidation. 2. The reactions of boron oxides B2O2 and B2O3 with boron films grown on tantalum(110)Yajun Wang and Michael TrenaryCite this: Chem. Mater. 1993, 5, 2, 199–205Publication Date (Print):February 1, 1993Publication History Published online1…
Composite films of carbon and SiO 2 were prepared by a rf cosputtering technique and their photoluminescence and absorption spectra were measured. A strong and broad photoluminescence peak located around 2.2 eV (visible to the naked eye) was observed for the samples with relatively low carbon concentrations. The blue…
Light-scattering and transmission properties of aligned nematic droplets dispersed in a solid polymer are studied. Theoretical evaluations of the differential and total cross sections are performed in the anomalous diffraction approximation. The corresponding attenuation coefficients are calculated in a single scatter…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular alignment of polymer liquid crystals in shear flows. 1. Spectrographic birefringence technique, steady-state orientation, and normal stress behavior in poly(benzyl glutamate) solutionsK. Hongladarom, W. R. Burghardt, S. G. Baek, S. Cementwala, and J. J. MagdaCite t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic mechanical relaxations of ethylene ionomersHitoshi Tachino, Hisaaki Hara, Eisaku Hirasawa, Shoichi Kutsumizu, Kenji Tadano, and Shinichi YanoCite this: Macromolecules 1993, 26, 4, 752–757Publication Date (Print):February 1, 1993Publication History Published online1 M…
The flow of a periodic suspension of two-dimensional viscous drops between two parallel plane walls is considered, and a framework for performing dynamic simulations with suspensions of increasingly complex structure is developed. The computations are based on an improved implementation of the boundary integral method…
The in vitro hydrolytic degradation of 2-0 size PDS monofilament suture was studied for the purpose of revealing its morphologic structure and degradation mechanism. The sutures were immersed in phosphate buffer of pH 7.44 for up to 120 days at 37 degrees C. These hydrolyzed sutures were examined by the changes in ten…
Abstract Incomplete and imperfect data characterize the problem of constructing electron density representations from experimental information. One fundamental concern is identification of the proper protocol for including new information at any stage of a density reconstruction. An axiomatic approach developed in oth…
The description of molecular shape is important in the analysis of protein-protein and protein-ligand interactions. We describe volumetric and surface-based techniques for computing shape properties of molecular surfaces. The surface is defined as an isocontour of an approximate electron density function. Each techniq…
This is a review of quantum chemical, statistical‐mechanical, electrostatic, and crystal chemical studies of phyllosilicates. Atomic‐level studies have examined the structure and bonding within phyllosilicate layers, the effects of cation substitution on bonding and charge distribution, the structure of water, and the…
Abstract The effects of cryogenically ground rubber tires (CGT) on some of the mechanical properties of blends with linear low density polyethylene (LLDPE) and high density polyethylene (HDPE) are presented. Precoating the CGT particles with an ethylene‐acrylic acid copolymer is shown to overcome most of the deleterio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of the mesogenic properties of monomeric, dimeric, and side-chain polymeric liquid crystalsC. T. Imrie, F. E. Karasz, and G. S. AttardCite this: Macromolecules 1993, 26, 3, 545–550Publication Date (Print):February 1, 1993Publication History Published online1 May 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultiphase structure of segmented polyurethanes: effects of hard-segment flexibilityYingjie Li, Zhiyong Ren, Ming Zhao, Huichang Yang, and Benjamin ChuCite this: Macromolecules 1993, 26, 4, 612–622Publication Date (Print):February 1, 1993Publication History Published online1…
A hierarchical structural classification is developed for the copper oxysalt minerals, based on the polymerization of coordination polyhedra of higher bond valences, and focusing specifically on [3]-, [4]-, [5]- and [6]-coordinate polyhedra. The nature of copper oxysalt structures is complicated by the extremely disto…
The PEEK glass transition (alpha-relaxation) is studied as a function of polymer semicrystalline morphology, characterized by small-angle X-ray scattering. An inverse relationship is observed between glass transition temperature and amorphous interlayer thickness. This is interpreted in terms of configurational entrop…
Muscle cramps induced by voluntary contraction and by electrical stimulation of the peripheral nerve were studied electrophysiologically in 10 healthy subjects. The aim was to verify that cramps can be evoked by electrical stimulation of peripheral nerve and to clarify the physiological mechanism responsible by analyz…
94 Monomeric units make up 1, the largest pure hydrocarbon yet characterized (C1134H1146). The compound which, thanks to its di-tert-butyl-phenyl groups, is extremely soluble in pentane (!) was obtained from the monodendron precursor and triiodobenzene with a Pd catalyst in 37% yield. Elemental analysis and 1H NMR spe…