Lubrication by molten polymer brushes
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Electrochemical and spectroscopic properties of dimeric cofacial porphyrins with nonelectroactive metal centers. Delocalization processes in the porphyrin .pi.-cation-radical systems
The proximity of two or more porphyrins has been shown to be crucial in numerous biological processes such as electron transfer or oxygen activation. We report the electrochemical and spectroscopic (UV-vis, EPR) behavior of two families of dimeric cofacial diporphyrins, either covalently linked by two amide bridges (F…
Weakly bound complexes of carbon monoxide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWeakly bound complexes of carbon monoxideCarol A. Parish, Joseph D. Augspurger, and Clifford E. DykstraCite this: J. Phys. Chem. 1992, 96, 5, 2069–2079Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March 1992https://pu…
Cocrystallization and phase segregation of polyethylene blends. 1. Thermal and vibrational spectroscopic study by utilizing the deuteration technique
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCocrystallization and phase segregation of polyethylene blends. 1. Thermal and vibrational spectroscopic study by utilizing the deuteration techniqueKohji Tashiro, Richard S. Stein, and Shaw L. HsuCite this: Macromolecules 1992, 25, 6, 1801–1808Publication Date (Print):March…
Effect of Inclusions on Densification: II, Numerical Model
Experimental studies conducted in conjunction with a numerical analysis of strain‐rate gradients have established the origin of the damage process that occurs upon the densification of powders containing nonsintering inclusions and reinforcements. The underlying phenomenon is the development of localized compressive s…
Structure and Density of Crosslinks in Natural-Rubber Vulcanizates. A Combined Analysis by NMR Spectroscopy, Mechanical Measurements, and Rubber-Elastic Theory
Abstract 13 C-NMR MAS solid-state spectroscopy and 1 H-NMR relaxation measurements have been applied for quantitative determination of crosslink density in sulfur-accelerated NR vulcanizates. It is shown that the 13 C-NMR method is able to distinguish between monosulfidic crosslinks and polysulfldic structures; theref…
Surface modifications of polyaniline films by graft copolymerization
Macromolecules
Direct Observation of Structure Formation at the Temperature-Driven Order-To-Disorder Transition in Diblock Copolymers
The order-to-disorder transition in a nearly symmetric diblock copolymer of polystyrene/poly(cis-1,4)isoprene (Mw = 15 700) was reproducibly observed in heating and cooling runs using small-angle scattering and rheological measurements. Small-angle x-ray scattering characterizes the ordered structure as consisting of…
High-temperature crystallization and morphology of poly(aryl ether ether ketone)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-temperature crystallization and morphology of poly(aryl ether ether ketone)Andrew J. Lovinger, Steven D. Hudson, and Don D. DavisCite this: Macromolecules 1992, 25, 6, 1752–1758Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published…
Factors affecting photoinduced alignment regulation of cyclohexanecarboxylate-type nematic liquid crystals by azobenzene molecular films
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFactors affecting photoinduced alignment regulation of cyclohexanecarboxylate-type nematic liquid crystals by azobenzene molecular filmsKoso Aoki, Takahiro Seki, Yasuzo Suzuki, Takashi Tamaki, Akira Hosoki, and Kunihiro IchimuraCite this: Langmuir 1992, 8, 3, 1007–1013Public…
Preparation of group 15 (phosphorus, antimony, and bismuth) complexes of meso-tetra-p-tolylporphyrin (TTP) and x-ray crystal structure of [Sb(TTP)(OCH(CH3)2)2]Cl
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of group 15 (phosphorus, antimony, and bismuth) complexes of meso-tetra-p-tolylporphyrin (TTP) and x-ray crystal structure of [Sb(TTP)(OCH(CH3)2)2]ClTanya Barbour, Warwick J. Belcher, Penelope J. Brothers, Clifton E. F. Rickard, and David C. WareCite this: Inorg.…
Microphase separation of charged diblock copolymers: melts and solutions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrophase separation of charged diblock copolymers: melts and solutionsJ. F. Marko and Y. RabinCite this: Macromolecules 1992, 25, 5, 1503–1509Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March 1992https://pubs.acs.…
Monte Carlo simulations of the extinction rate of dense media with randomly distributed dielectric spheres based on solution of Maxwell’s equations
We present Monte Carlo simulations of the extinction rate of dense media with randomly distributed dielectric spheres that occupy up to 25% by volume and size parameter ka = 0.2. Maxwell’s equations in multiple-scattering form are solved iteratively for each realization. Convergence is demonstrated numerically by vary…
Ordering of copolymer thin films as revealed by atomic force microscopy
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdering of copolymer thin films as revealed by atomic force microscopyB. Collin, D. Chatenay, G. Coulon, D. Ausserre, and Y. GallotCite this: Macromolecules 1992, 25, 5, 1621–1622Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published i…
"Hardness profile" of a reaction path
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT"Hardness profile" of a reaction pathDipankar DattaCite this: J. Phys. Chem. 1992, 96, 6, 2409–2410Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March 1992https://pubs.acs.org/doi/10.1021/j100185a005https://doi.org/10…
Model surface studies of metal oxides: Adsorption of water and methanol on ultrathin MgO films on Mo(100)
Model surface studies of magnesium oxide have been carried out using surface sensitive techniques. Ultrathin MgO films have been synthesized under ultrahigh vacuum (UHV) conditions by thermally evaporating Mg onto Mo(100) in the presence of oxygen. Low-energy electron diffraction (LEED) studies indicate that the MgO f…
High‐Performance Polymers
The various applications of high‐performance polymers , for example in hollow‐fiber membranes (see figure) or as gears in chemical pumps, require materials with widely differing properties. An overview of the different classes of high‐performance polymers available, including polyetherketones, polysulfones, and polyam…
Luminescence and structural study of porous silicon films
The luminescence properties of 3 μm thick, strongly emitting, and highly porous silicon films were studied using a combination of photoluminescence, transmission electron microscopy, and Fourier transform infrared spectroscopy. Transmission electron micrographs indicate that these samples have structures of predominan…
Solutions of three-dimensional multiply connected and open boundary problems by BEM in three-phase combination transformers
A boundary element method (BEM) in terms of magnetic vector potential and electric scalar potential is successfully applied to three-dimensional, multiply connected, and open boundary problems caused by the heavy current of leads in a three-phase combination transformer. The quasi-frontal method is employed for the so…
SrCO3 by XPS
X-ray photoelectron spectroscopy measurements of the principal core levels of high purity strontium carbonate are presented.