Materials Literature
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Ethylene diamine tetra acetic acid (EDTA) is a versatile complexing agent and is being employed in decontamination formulations. The dilute chemical decontamination (DCD) process employs ion exchange resins for regeneration of complexants, collection of metal ions/active isotopes and for removal of the decontaminating…
Abstract The resonance Raman spectra of side‐on type dioxygen adducts of Mn(TMP), Mn(TPP) and Mn(OEP), where TMP, TPP and OEP denote the dianions of tetramesityl‐, tetraphenyl‐ and octaethyl‐porphines, respectively, were measured in O 2 ‐Ar(1 : 30) matrices at ca. 15 K. The bands near 990, 710 and 430 cm −1 were assig…
Contact angle measurements have been widely used1–6 to calculate the values of the dispersion force, γ d s , and polar force, γ p s , components to the total surface free energy of a material using a derivation originally proposed by Kaelble.2 In this analysis a pair of simultaneous equations is derived which for two…
Abstract Crystallization kinetics of short glass and carbon fiber composites of poly(ether ether ketone) (PEEK) under melt‐strain conditions have been obtained for the first time, using in ‐ situ wide angle X‐ray scattering, and have been correlated to a model based on the Avrami equation in order to enable minimizati…
Abstract Annealing poly(ethylene terephthalate) (PET) at high temperature results in a crystalline phase stable to 10°C higher than the temperature previously regarded as the equilibrium melting point. Melting temperatures as high as 289°C can be attained, which is equivalent to the equilibrium melting point determine…
Solutions of TeO 2 (0.001 M) in HCl over a range of concentrations are shown to contain TeCl 2 (OH) 2 in addition to TeCl 6 2− and TeCl 4 (OH) − . The hydrolysis constants for TeCl 6 2− and TeCl 4 (OH) − have been determined from a reconsideration of earlier UV-visible spectrophotometric results (1)[Formula: see text]…
A description of the design and setup of an experimental technique for measurement of the response function in shear sensitive liquid crystals has been reported. Utilizing the selective reflection characteristics of cholesteric liquid crystals, the method is capable of measuring the delay, rise, and relaxation times i…
Abstract Systematic changes of drying conditions of poly(acrylic acid) were tested to study their effect on the glass transition of the material. The materials were synthesized in two different mediums of water and benzene, respectively. The glass transition temperatures of the samples were determined by thermal analy…
A novel process for the formation of microchannels in polycrystalline diamond thin film on a single‐crystal silicon substrate is developed using anisotropic chemical etching of silicon and selective deposition of diamond. The polycrystalline diamond thin films were grown by high‐pressure microwave plasma assisted chem…
Some questions are raised regarding the model described by Crichton et al. (see ibid. vol.24, p.335-342, 1989) in which the entire volume of the void is considered to be involved in the discharge process. The commenter questions how it can be explained that an increase in the applied voltage results in an increase in…
In order to understand the behaviour of Ti–24 at.% A1–11 at.% Nb alloys during high-temperature deformation it appears relevant to have some information on the microstructures produced by high-temperature anneals of heavily deformed materials. In this work these microstructures have been studied after heat treatments…
Abstract Vesignieite, Cu 3 Ba(VO 4 ) 2 (OH) 2 , crystallizes in space group C 2 / m with a ° = 1.0270(2), b ° =0.5911(1), c ° = 0.7711(2)nm and β =116.42(3)°. The intensity data were collected with the RIGAKU RASA‐IIS single‐crystal four‐circle diffractometer. The structure was determined by Patterson and Fourier meth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of the partially substituted (phenoxy)chlorocyclotriphosphazenes by phase-transfer catalysisY. W. Chen-Yang, S. J. Cheng, and B. D. TsaiCite this: Ind. Eng. Chem. Res. 1991, 30, 6, 1314–1319Publication Date (Print):June 1, 1991Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses and properties of poly(B-vinylborazine) and poly(styrene-co-B-vinylborazine) copolymersKai Su, Edward E. Remsen, Helen M. Thompson, and Larry G. SneddonCite this: Macromolecules 1991, 24, 13, 3760–3766Publication Date (Print):June 1, 1991Publication History Publish…
Abstract Characteristic absorption of the anion radical of pyromellitimide around 715 nm was demonstrated to be particularly useful for studies on photoinduced electron transfer reactions. Charge recombination in pyromellitimide-linked porphyrin was greatly retarded in benzene due to the large energy gap and small reo…
Abstract A brief review of addition polymerization processes is presented with a summary of the key characteristics classified by kinetic mechanism (free‐radical, anionic, cationic, group transfer, or Ziegler–Natta), phase behavior, and reactor type. A practical approach to modelling in the industrial R & D enviro…
The characteristics of Positive Temperature Coefficient of Resistivity (PTCR) thermistors depend strongly on the atmosphere, especially oxygen, during the fabrication process. The PTCR jump decreases when the sample is heated in a reducing atmosphere, while it increases when the sample is heated in air. The behavior o…
Achievement of good formability in aluminium sheet requires control of the final texture. Earing in deep drawing is a common problem in aluminium sheet and can be minimised by careful texture control. In practice, this means the control of recrystallisation during thermomechanical processing as well as control of part…
Capacitor-grade polypropylene films were aged under multiple stresses (electrical, thermal, and radiation). The aging experiments were performed for both singular and simultaneous combined stresses. The polypropylene was exposed to combined neutron-gamma radiation with a total dose of 1.6*10/sup 6/ rad, electrical str…
Impurity levels in Cd-doped GaSe have been studied by using photoluminescence (PL) measurements. The PL spectra at 77 K are dominated by three new emission bands at 1.95, 1.75, and 1.62 eV. The PL intensity and the peak energy of the 1.95 and 1.62 eV emission bands are measured as a function of the temperature. It is…