Materials Literature
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Abstract The thermal stability and degradation kinetics of several polystyrenes and styrene–alkyl methacrylate copolymers and terpolymers with a number‐average molecular weight ( M̄ n ) of 6000–250,000 g/mole have been studied using dynamic thermogravimetry (TG). The degradation kinetics of each polymer sample have be…
Abstract Small‐angle x‐ray scattering (SAXS) of isotropic or uniaxially oriented nylon 6 was investigated as a function of thermal and mechanical history. In addition to the peak position and linewidth of the SAXS maximum, the integrated SAXS intensity was measured. It was found that the radial intensity distributions…
Abstract Ultraoriented films of high density polyethylene (HDPE) have been prepared in continuous lengths by a new method, solid state coextrusion, through conical dies of extrusion draw ratios up to 36. Preformed HDPE billets ∽7 cm long and ∽1 cm in diameter of duPont Alathon 7050R, M w = 59,000, M n = 19,900, were s…
The thermoluminescence kinetics have been determined for the 13 glow peaks contained in the glow curves obtained from LiF TLD-100 after exposure to 60Co irradiations. The glow curves were constructed from measurements made with recently developed equipment for recording emission spectra at closely spaced temperature i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT(3-Methyl-3-methoxy-1-butynyl)copper, a useful reagent for the generation of mixed cupratesE. J. Corey, David Floyd, and Bruce H. LipshutzCite this: J. Org. Chem. 1978, 43, 17, 3418–3420Publication Date (Print):August 1, 1978Publication History Published online1 May 2002Publ…
Lead-zirconate–lead-titanate (PZT) thin films with perovskite and pyrochlore structures were successfully fabricated on several kinds of substrates by rf diode sputtering. Semiquantitative compositional analysis of the deposited thin films were made with Auger electron spectroscopy (AES). The films were deposited from…
It has been shown that the sensitization of Type 304 stainless steel occurs at temperatures well below the normal isothermal temperature range for sensitization. A prerequisite for this low temperature sensitization (LTS) is the presence of chromium carbide nuclei along grain boundaries. This paper shows that the ther…
Abstract An experimental study was carried out to investigate the effects of titanate coupling agents on the rheological properties of p articulate‐filled polyolefin melts. Inorganic fillers used were CaCO 3 , talc, and fiberglass, and polyolefins used were high‐density polyethylene (HOPE) and polypropylene (PP). It w…
Abstract Ethanol was catalytically produced in the CO–H2 reaction under atmospheric pressure and at 150–250 °C over rhodium crystallite catalysts prepared from Rh carbonyl cluster compounds highly dispersed on La2O3, TiO2, and ZrO2. The activity and selectivity of ethanol formation depend on the kind of metal carbonyl…
In the present study, the correlation between fractional ionic character and dielectric constants is applied to predict the magnitudes of the static dielectric constant ε0 of the several alkaline-earth-chalcogenide solids. The calculated values of ε0, together with the other known experimental data of these solids, ar…
Abstract The thermodynamic theory of the elastic and dielectric properties of ammonium dihydrogen phosphate is developed on the basis of the improper phase transition. By the representation analysis the transformation properties of the two‐component order parameter are investigated and the thermodynamic potential of t…
The influence of a small pretilt on the voltage dependence of the capacitance ( C - V ) of non-twisting liquid crystal cells is described. Calculated C - V curves were fitted to the observed ones by adjusting the value of a single parameter, the pretilt angle; the magnitudes of the pretilt angle obtained in this way w…
A series of eight alkyl bis(biguanide) analogues of alexidine, N,N''''-1,6-hexanediyl bis[N'-(2-ethylhexyl)imidodicarbonimidic diamide] (1), was prepared. Five of these analogues constituted a series isolipophilic with 1 but with varying bridge length between biguanide moieties. The compounds were evaluated in vitro f…
Abstract Die Inhibitionswirkungen von Propan(1,3)‐biphosphonsäure und Hexan(1,6)‐biphosphonsäure auf die Korrosion von hochreinem Eisen (polykristallin, rekristallisiert) in wäßrigen Sulfatlösungen im Bereich 4 ≤pH ≤6 in Abwesenheit und Gegen wart von Sauerstoff wurde bei T = 298 K untersucht. Es wurden stationäre und…
1. The shells of specimens of Semibalanus balanoides and Balanus balanus were loaded in compression. For shells of similar mass or pseudovolume (1 χ b χ h), B. balanus was about four times as strong as S. balanoides. 2. The morphology of the shell plates and their junctions is described. The shell of B. balanus is mec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigher coordinate cyanide and isocyanide complexes. 7. Synthesis and characterization of seven-coordinate molybdenum(II) and tungsten(II) isocyanide complexesChiu T. Lam, Miroslav Novotny, David L. Lewis, and Stephen J. LippardCite this: Inorg. Chem. 1978, 17, 8, 2127–2133Pu…
The properties of a particle undergoing translational diffusion in one dimension, in the presence of a cosine potential, are investigated. Translational order parameters are defined and the neutron incoherent scattering law is calculated. The simple diffusion model and the jump model between equidistant sites are foun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilities of carbonium ions in solution. 8. Heats of ionization of some simple alkyl halides in superacidic mediaEdward M. Arnett and Craig PetroCite this: J. Am. Chem. Soc. 1978, 100, 17, 5408–5416Publication Date (Print):August 1, 1978Publication History Published online…
The breakdown threshold and two-photon absorption coefficient are measured in diamond with picosecond pulses at 1.06 and 0.53 μm. The rms breakdown threshold at 1.06 μm is 21.5 MV/cm. The two-photon absorption coefficient at 0.53 μm is less than2.6 \times 10^{-4}cm/MW.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(carbon monofluoride): a solid, layered fluorocarbonPeter Kamarchik, Jr. and John L. MargraveCite this: Acc. Chem. Res. 1978, 11, 8, 296–300Publication Date (Print):August 1, 1978Publication History Published online1 May 2002Published inissue 1 August 1978https://pubs.ac…