Materials Literature
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Regulations are continually being passed that limit the volatile organic content (VOC) of elastomer coating systems. Because of this restriction, high solids, two-component spray elastomers and coatings are attaining in creases in market interest and sales volume. As this interest grows, the research and development e…
Crystals of the 1:3 complex between antimony triiodide and sulfur, SbI3 * 3S8, are found to possess a high second-order optical nonlinearity. The powder second-harmonic generation efficiency is found to be approximately half of that of the isostructural complex of iodoform with sulfur, CHI3 * 3S8. Second-harmonic gene…
Abstract Differential scanning calorimetry (DSC) was used to study the effects of melt history on the isothermal crystallization kinetics of poly(phenylene sulfide) (PPS). Crystallization of the polymer was shown to be permanently altered by both the time and the temperature spent in the melt. Suggested explanations a…
We discuss simulations using a recently derived Monte Carlo method which generates the isoenthalpic-isotension-isobaric ensemble or HtN ensemble of classical statistical physics. This method is the Monte Carlo counterpart of the Andersen-Parrinello-Rahman HtN form of molecular dynamics. As an example of the use of HtN…
Abstract Authigenic chlorites and illites coexisting in clastic reservoir sandstones have been studied by energy dispersive X-ray spectroscopy (EDS) in the transmission electron microscope (TEM). All 16 samples studied are drill or sidewall cores from sandstones of relatively uniform age situated offshore Norway with…
Recently, we amplified the Lactobacillus bulgaricus NAD(+)-dependent D-lactate dehydrogenase gene by the polymerase chain reaction, cloned and overexpressed it in Escherichia coli (Kochhar, S., Chuard, N., and Hottinger, H. (1992) Biochem. Biophys. Res. Commun. 185, 705-712). Polymerase chain reaction-amplified DNA fr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of the porphyrin macrocycle on the spectroscopic properties and catalytic activity of electroreduced nickel(II) porphyrinsK. M. Kadish, M. M. Franzen, B. C. Han, C. Araullo-McAdams, and D. SazouCite this: Inorg. Chem. 1992, 31, 21, 4399–4403Publication Date (Print):Oc…
We investigated ${\mathrm{Pr}}_{2}$${\mathrm{BaO}}_{4}$ and ${\mathrm{PrBaO}}_{3}$ by several complementary experimental techniques. ${\mathrm{PrBaO}}_{3}$ crystallize in an orthorhombic structure. dc and ac susceptibility measurements exhibit irreversibility phenomena below ${\mathit{T}}_{\mathit{N}}$=11.7 K and reve…
The recently developed dynamic plane source (DPS) technique for simultaneous determination of the thermal properties of fast thermally conducting materials with thermal conductivities between 200 and 2 W/mK has now been extended for studying relatively slow conducting materials with thermal conductivities equal or bel…
Abstract A critical demand in environmental modeling and a desirable but elusive goal of research on the ion exchange properties of the charged solid surface has been to determine the selectivity coefficient from fundamental properties of the ions and surface. We developed a Hard and Soft Acid and Base (HSAB) Model to…
Abstract X-ray photoelectron spectroscopy (XPS) has been used to characterize the bonding state of Cu 2+ , Si 4+ , Al 3+ , and O 2− ions in structural (octahedral and interlamellar) or adsorbed position in phyllosilicates. Five smectites, 5 kaolinites, and 1 chrysocolla with Cu(II) in known positions (octahedral, inte…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation D. W. Adrian, A. J. Giacomin; The quasi‐periodic nature of a polyurethane melt in oscillatory she…
An efficient algorithm is developed to numerically compute solutions of problems related to crystal growth. The method is based on an integral equation formulation that involves an integration over the entire history of the growth. A direct calculation of this memory integral becomes more costly as time increases, but…
As a model of the bending unit of fibers, a curved beam is assumed in place of the straight beam used by many workers after van Wyk, and the compressibility of fiber assemblies is discussed on a previously established micromechanical basis. The analysis can reproduce well the real functional dependence of stress on st…
Abstract Samples of {4‐(dimethylamino) stilben Z & E 4'‐yl} dimesityl borane (BNS) were synthesised and investigated for their non‐linear optical properties. The results show that the quadratic hyperpolarisability of the Z‐isomer is smaller than that of the E‐isomer, the beta value found for the latter being as hi…
The effects of hydrostatic pressure on the dynamics and energetics of the β molecular relaxation process and on the ferroelectric (Tc ) and melting (Tm ) transition temperatures of the ferroelectric copolymer P(VDF0.7TrFE0.3) have been investigated. Pressure causes a large slowing down of the β relaxation as well as l…
Abstract Thermal decomposition of polyglycidyl azide (GAP) and bis(azidomethyl)oxetane/tetrahydrofuran copolymer (BAMO/THF) was studied by TGA and DSC in helium atmosphere, which was showing overall first‐order kinetics. The additional azide groups at terminal position in the molecular structure decomposed independent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControl of the anisotropic mechanical properties of liquid crystal polymer films by variations in their banded textureJ. Wang and M. M. LabesCite this: Macromolecules 1992, 25, 21, 5790–5793Publication Date (Print):October 1, 1992Publication History Published online1 May 200…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic and morphological studies of highly conducting ion-implanted rigid-rod and ladder polymersJohn A. Osaheni, Samson A. Jenekhe, Andrew Burns, Gang Du, Jinsoo Joo, Zhaohui Wang, Arthur J. Epstein, and Chi Shun WangCite this: Macromolecules 1992, 25, 21, 5828–5835P…
During the course of investigating dehydrogenation reactions induced by transition metals, we find that using a carrier gas containing hydrocarbons and ammonia instead of pure helium, in conjunction with a laser vaporization device, enables the facile production of metal–carbon and metal–nitrogen clusters in both the…