Materials Literature
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X-ray diffraction measurements have been carried out on the nematic phase of nBABA (n = 1 to 9). Our results show that this nematic phase is a fibre type one having in addition to the orientational long range order, two types of short range orders, (SROs): (i) one dimensional correlations of the molecular dimers along…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarizability of polyethyleneR. H. Boyd and L. KesnerCite this: Macromolecules 1987, 20, 8, 1802–1806Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987https://pubs.acs.org/doi/10.1021/ma00174a017https://doi.o…
Abstract α, β‐Bis(hydroxyphenol) tetramethyl bisphenol‐A polysulfone (PSUT) was synthesized by two different methods, one using a strong base, the other using a weak base. The bifunctional polysulfone containing tetramethyl bisphenol‐A chain ends was exploited as a model telechelic that can be used for the preparation…
AC impedance spectroscopy is applied to monitoring the chemical-physical condition of polymer dispersed liquid crystals (PDLC). The results define an approach for non-destructive evaluation as the PDLC is designed into informational displays. Response. functions are linked to electrical properties of the constituents…
The presence of an amorphous thermal oxide film on an aluminum surface causes continuous incremental structural changes in a subsequently grown amorphous anodic oxide. This has been studied by measurement of oxide dissolution rates and by DTA analysis of stripped films. Thin films of thermal + anodic oxide have the sa…
Bidri vessels have been manufactured in India from at least the seventeenth century until the present day and are known to be made of a zinc alloy, decorated with inlays of silver, brass or, occasionally, gold. The inlays contrast strikingly with the matt black patina of the vessel. It is this patina, easily damaged b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSignificance of entropic factors in mechanical deformation of polymeric glassesRobert R. Matheson Jr.Cite this: Macromolecules 1987, 20, 8, 1847–1851Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987https://pu…
Abstract An approach for modeling and simulation of multifilament melt spinning of poly(ethylene terephthalate) fibers is presented. It is shown that the quench conditions seen by the filaments within a bundle are not identical but differ for different rows of filaments. This, in turn, affects the spun fiber propertie…
An analysis of the physics of cementation processes (metal displacement) is presented. Hydrogen,H+, and hydride, H-, ions are shown to be the key intermediate species in cementation processes. The possibility of either diffusional transport of noble species or migrational transport of hydrogen species is suggested, an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal desorption behavior of aliphatic and aromatic hydrocarbons loaded on activated carbonPaul K. T. Liu, Steve M. Feltch, and Norman J. WagnerCite this: Ind. Eng. Chem. Res. 1987, 26, 8, 1540–1545Publication Date (Print):August 1, 1987Publication History Published online…
The chemistry subsequent to the dielectric breakdown of SF6 under "mild" conditions has been modeled on the basis of known or estimated chemical kinetic data for the neutral reactive species postulated to be formed in the breakdown process. The emphasis is on the significance of S2FlO as an end product of dielectric b…
An analytic derivation is given of rules exactly describing the hierarchical band clustering in the spectrum of Harper's equation for various incommensurate systems. These rules, involving transformations of the incommensurability parameter phi , are shown to apply exactly for arbitrary coupling strength. The approach…
We have developed a new method to prepare lead iron niobate, Pb(Fe1/2Nb1/2)O3, by using organometallic precursors. The metal-containing sol was prepared by hydrolysis of the metal alkoxides. Homogeneous mixing of the constituents is achieved at the molecular level and densification of the ceramic occurs at temperature…
The adsorption mechanism of silane coupling agent on the colloidal silica surface is studied with spin-labeled silane coupling agent using ESR method. The density of the adsorbed silane molecules was determined to be approximately 1.5-2 molecules per 100 A2 of the silica surface in 95% ethanol solution. In addition, E…
Insulating systems employing polyethylene terephthalate and polypropylene were tested for dielectric strength and time-to -break under pulsed and ramped voltages in the pulsewidth range of 0.2 to 5 μs with risetimes of 20 ns to 5 ps at a repetition rate of 500 pps. The dependence of dielectric strength and time-to-bre…
Abstract The kinetics of interfacial polycondensation of bisphenol A with isophthaloyl chloride and terephthaloyl chloride in dichloromethane with triethylbenzylammonium chloride (TEBAC) as the catalyst was investigated via measurements of bisphenolate concentration by UV. The reaction was found to be second order wit…
The conducting polymer field has continued its rapid expansion during the past 10 years since the discovery that an organic polymer, polyacetylene, could be doped to the metallic regime. A number of new conducting polymers have since been synthesized and many chemical, structural and physical studies have helped in el…
The corrosion behavior of carbon steel, austenitic stainless steels, Ni-base alloys, and nickel In hot, concentrated caustic soda solutions at the active potential range was investigated. The corrosion rate obtained in the boiling solution was larger than that in the hydrogen-saturated solution of the same concentrati…
Films of the transparent conductor indium‐tin‐oxide (ITO) have been deposited successfully by direct thermal evaporation of metallic indium and tin in an oxygen ambient. Various techniques, such as scanning and transmission electron microscopy, x‐ray diffraction, electron microprobe analysis, Hall measurements, and op…
We describe parallel optical XOR and XNOR logic gates implemented with ferroelectric liquid-crystal (FLC) electro-optic elements to yield naturally a logic in which the binary gate outputs are indicated by two orthogonal polarizations of transmitted light. These gates absorb no power from the incident light beam and h…