Materials Literature
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Abstract ABA‐type “tapered” block copolymers of α‐methylstyrene (monomer A) and butadiene were prepared using four commercially available dilithio initiators. Polymerizations were run at 25°C in benzene solvent, or at 40°C with butadiene dissolved in neat α‐methylstyrene. Although α‐methylstyrene has a rather low ceil…
Article Crystal structure of LiH2PO4, structural topology and hydrogen bonding in the alkaline dihydrogen orthophosphates was published on October 1, 1978 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 146, issue 1-6).
Abstract Different samples of high‐density polyethylene provided different nucleation densities which were assessed by optical microscopy and light scattering. Crystallizations were carried out under controlled cooling rates using a microscope hot stage and DSC from which crystallization temperatures were obtained. It…
The Fermi surface touching the Brillouin zone boundary not only stabilises the BCC crystal structure, but also promotes ferromagnetism in Heusler alloys.
Results are presented and analyzed for mixtures of normal and deuterated polyethylene. Some of the results are used to determine single-chain radii of gyration in bulk polyethylene. The radii of gyration are found to be smaller for solution-crystallized samples than for melt-crystallized samples and smaller for slowly…
Voltage oscillations observed in switching VO2 needles are associated with traveling semiconductor domains driven by the Peltier effect at their boundaries. The model is supported by the dependence on current of the two time constants characterizing the rectangular synchronous oscillations.
Staphylococcus epidermidis ATCC 14990 possesses an l-lactate dehydrogenase dependent on nicotinamide adenine dinucleotide (NAD) which is activated by fructose 1,6-bisphosphate (fructose-1,6-P2). Molecular weight studies with purified l-lactate dehydrogenase showed that fructose-1,6-P2 is necessary to stabilise the tet…
Abstract The degradation of ammonium polymethacrylate and polymethacrylamide has been studied by a combination of thermal analysis methods (TVA and TG) and examination of volatile and involatile products by infrared analysis. It is shown that total reaction comprises an initial cyclization and further fragmentation of…
An idealized composite model of a square biaxially loaded coated fabric is proposed. The model consists of straight linearly elastic yarns embedded in a thin layer of a linearly elastic isotropic coating material with the system loaded in the plane of the membrane. Governed by the assumptions of small strains, equatio…
Heat-capacity and magnetic-susceptibility measurements at low temperatures on single crystals of RbCo${\mathrm{Cl}}_{3}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O are described here which indicate that this material is the first reported example of a magnet which can be formally described as having…
The coat protein of Bacillus subtilis spores comprises about 10% of the total dry weight of spores and 25% of the total spore protein. One protein with a molecular weight of 13,000 to 15,000 comprises a major portion of the spore coat. This mature spore coat protein has histidine at its NH2 terminus and is relatively…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT2,2,6,6-Tetramethyl-4-oxo-1-(1,1-diphenylethoxy)piperidine: synthesis and thermal stabilityJ. A. Howard and J. C. TaitCite this: J. Org. Chem. 1978, 43, 22, 4279–4283Publication Date (Print):October 1, 1978Publication History Published online1 May 2002Published inissue 1 Oct…
The compressive behavior of a rigid polyurethane foam reflects its geometric structure and the physical properties of the matrix polymer. Foam properties may be modified by the inclusion of silica particles in the polymer matrix. These silica particles alter the mechanical properties of the base polymer as well as the…
Bicrystals of niobium with symmetric tilt boundaries grown directly from the melt with bicrystal seeds have been used as a model system to measure the resistive critical current Ic as a function of the applied transverse magnetic field H and angle φ, between H and the grain boundary plane. The specimens were investiga…
Earlier Raman studies confirming the molecular dissolution of protium and Geuterium in silica have been extended to include room-temperature measurements of the vibra ional-rotational Raman bands and the temperature dependence (11-800 K) of the $Q$ bands. Observation of the $S$ bands provides evidence for ${\mathrm{H}…
The effects of deviations from an ideal lamellar structure (infinite-size clusters of parallel layers of alternating electron densities) on the small-angle scattering curve are treated with the aid of the correlation function. If surrounded by a matrix of the average electron density, reduction of the size of the clus…
Although the magnetic properties of Cr–Fe alloys have been widely studied, there are different interpretations of existing data in the literature, especially for alloys in the concentration range 10 to 25% Fe. The onset of ferromagnetism occurs somewhere in this concentration range, but there is little direct evidence…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
The curious phenomenon of shell torsion arose independently among members of two separate lineages within the Pteriomorpha (Bivalvia), the Arcidae and the Bakevelliidae. In torted bivalves the shell is twisted about the hinge axis normal to the antero-posterior direction, and the usually two-dimensional plane containi…
Polycarbonate absorbs water in two stages: in the initial period of absorption at an elevated temperature all of the water was found in an unassociated state when cooled to room temperature; and, in the second stage, most of the additional water absorbed by the polymer was identified in a separate liquid phase (cluste…