Materials Literature
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A simple sequential scheme is developed for the efficient removal and classification of dyes from 1–cm to 2–cm lengths of nylon, polyacrylonitrile and polyester fibres.
During a series of experiments aimed at developing a better understanding of the basic mechanisms of electrical treeing in polymer insulations, the dependence nce of the dc conductivity of polyethyle ( with and without additives) on temperature and field strength was examined. It was discovered that all additives, and…
The dynamic mechanical and dielectric relaxations of plasticized and un-plasticized cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate were characterized. Three relaxations common to all compositions were found (α, β, and γ), while a fourth (5) was observed only in cellulose acetate butyra…
Two isozymes of NADP+-specific isocitrate dehydrogenase [ICDH; EC 1.1.1.42] were confirmed to be present in an obligately psychrophilic marine bacterium, Vibrio sp., strain ABE-1, on the basis of the temperature-activity curve and electrophoretic mobilities. These isozymes were separated and purified about 170-fold fo…
We present a theoretical study of the propagation of magnetoelastic waves in a ferromagnetic film bonded to a nonmagnetic substrate. We find magnetoelastic waves which correspond to both Rayleigh waves and Love waves modified by the magnetoelastic interaction. Deviations from the elastic-wave characteristics are found…
Abstract Infrared spectroscopy and differential scanning calorimetry were used to study the imidization and crosslinking kinetics of norbornenyl‐capped addition type of polyimide resins (designated PMR for polymerization of monomer reactants). The spectral and thermal analyses were performed on resin specimens that ha…
In order to gain a better understanding of the change in the film composition as a function of the Cr content of an alloy or the electrode potential, surface analyses by modulation spectroscopy were performed on a series of Fe‐Cr alloys (5–70 weight percent Cr), pure Cr, and pure Fe at various anodic potentials in an…
Abstract The accomplishments of Borden Award Winner John K. Gillham and his colleagues using Torsional Braid Analysis (TBA) and Differential Scanning Calorimetry (DSC) to investigate the T g and T > T g or T u regions of anionic and thermal poly styrenes (PS) are evaluated and related to work on PS and other polyme…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhthalocyanine thin films as semiconductor electrodesFu-Ren Fan and Larry R. FaulknerCite this: J. Am. Chem. Soc. 1979, 101, 17, 4779–4787Publication Date (Print):August 1, 1979Publication History Published online1 May 2002Published inissue 1 August 1979https://pubs.acs.org/…
The electronic band structure of zinc-blende CuCl is computed using a self-consistent, first-principles, all-electron approach. The calculated energy levels agree with photoemission results and support a minimum-direct-gap interpretation of the optical data. Contrary to the indirect model proposed by Rusakov and used…
High-resolution c-axis images of the biopyribole minerals anthophyllite [(Mg,Fe)' Si8Orr(OH)rl, jimthompsonite [(Mg,Fe),oSi,rOrr(OH)o], and chesterite [(Mg'Fe),rSiro O'4(OH)61 have been produced in the transmission electron microscope. Interpretation of the images has been confirmed by dynamical electron di-ffraction…
The dislocation theory of the liquid state is refined by an accurate assessment of the interaction energy between dislocations. This shows a screening phenomenon which gives a first-order transition rather than the second-order transition of simpler theories. Within this framework, a theory of glass is constructed in…
Abstract The calcination of synthetic hydrotalcites of different compositions gave aluminium magnesium double oxides with strong basic sites and a high catalytic activity towards the polymerization of β-propiolactone. The strong basic sites were determined and compared with the apparent polymerization rates, suggestin…
Abstract— Ab initio configuration interaction wavefunctions and energies are reported for the ground state and many low‐lying excited singlet and triplet states of ethyl pheophorbide a (Et‐Pheo a ) and ethyl chlorophyllide a (Et‐Chl a), and are employed in an analysis of the electronic absorption spectra of these syst…
An indexed powder pattern is reported for Mg2Na4O10Si3. The unit cell is orthorhombic, a = 10.584 (7), b = 14.328 (7), c = 10.457 (7) Å. Transition to a cubic phase, a = 7.440 Å, occurs at 918 K. A Na-deficient tetragonal phase was also observed.
This paper reports some irradiation effects and recovery behavior of neutron irradiated boron carbide pellets that were used as control rod elements in the Enrico Fermi Fast Breeder Reactor. Measurements were carried out on changes in lattice parameters, thermal expansion, helium release, elastic moduli and microstruc…
BaSb 2 Se 4 crystallizes in the monoclinic system, space group P2 1 /n, with a = 923.7 ± 0.8 pm, b = 2076 ± 3 pm, c = 855.1 ± 0.8 pm, β = 91.2 ± 0.1°. One half of the Sb atoms form ψ-tetrahedra with three neighbouring selenium atoms, the other half forms ψ-trigonal bipyramids with four selenium atoms. These polyhedra…
Abstract Fourier transform infrared spectroscopy (FT‐IR) has been applied to the study of the molecular mechanisms of transitions of atactic polystyrene above T g . Intensity measurements of vibrational modes as a function of temperature revealed two transitions above T g , which are designated as T u and T ′ u . T ′…
The hardening of iron-chromium alloys containing more than 13 wt-%Cr in the temperature range 550–800°C is well known and is ascribed to the formation of σ-FeCr. Severe embrittlement at lower temperatures, commonly referred to as ‘475°C embrittlement’, is less well understood and has been variously ascribed to σ-phase…
Abstract The reflection spectra of Bi 12 GeO 20 and Bi 12 SiO 20 single crystals are studied in the spectral region 50 to 1000 cm −1 at 90 and 300K. Both the single crystals are found to exhibit several reflection bands which are ascribed to the interaction of electromagnetic radiation with normal modes of F‐symmetry…