Materials Literature
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Abstract Copolymerization of various monoisocyanates with ethylene oxide was attempted in relation to the alternate copolymerization of phenyl isocyanate with ethylene oxide by triethylaluminum catalyst. It was found that aliphatic and alicyclic isocyanates are not copolymerizable at all while many of aromatic isocyan…
Abstract A differential scanning calorimeter has been used to measure the heat capacity of both melt and solution crystallized samples of isotactic polypropylene from 200 to 500°K. An estimate has been made of heat capacity values below 200°K. Values of the heat capacity, entropy, enthalpy, and free energy have been e…
"The Space Dependence of Reactor Noise-II Calculations." Nuclear Science and Engineering, 39(3), pp. 413–414
Decarboxyschizopelt-Säure liefert bei der Entmethylierung mit Bortribromid Di-O-desmethyl-decarboxyschizopelt-Säure, die eine positive Gibbssche Reaktion zeigt. Daraus folgt für Schizopeltsäure Struktur 1 (1.6-Dimethoxy-3.8-dimethyl-7-methoxycarbonyl-dibenzofuran-4-carbonsäure).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Time on Infrared Spectra of Epoxy PyrolyzatesEugene CerceoCite this: Ind. Eng. Chem. Prod. Res. Dev. 1970, 9, 1, 96–100Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Published inissue 1 March 1970https://pubs.acs.org/doi/10.1021…
Raman spectra, with polarizations, are given for a series of B2O3–Bi2O3–Al2O3 glasses in the composition range 0–96 wt% Bi2O3. The spectra of the mixed glasses are different from that of B2O3 except at the lowest Bi2O3 concentration. The low-wavenumber region of the mixed glasses changes in a systematic fashion, with…
The problem of a uniformly moving circular surface load of a general orientation on an elastic half space for two types of load distribution, viz., “uniform” and “hemispherical,” is considered. The solutions have been obtained in integral form. The displacements on the surface of the half space, in the case in which t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic Synthesis of Lactic Acid from Acetaldehyde, Carbon Monoxide, and WaterS. K. Bhattacharyya, S. K. Palit, and A. R. DasCite this: Ind. Eng. Chem. Prod. Res. Dev. 1970, 9, 1, 92–95Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Publ…
The kinetics of burnout of natural organic matter in building clays were investigated. The results indicate that burnout occurs in two stages for extruded bodies. The temperature dependence of the reaction rate during the first stage was the same as that for the diffusivity of an O 2 /CO/CO 2 gas mixture. It is, there…
The absolute thermoelectric power S and the electrical resistivity p of polycrystalline samples were determined between 80°K and 580°K for Cr[sbnd]V alloys with up to 77 at. % V and between 300° and 750°K for Cr[sbnd]Mn alloys with up to 10 at. % Mn respectively. S of all alloys is positive. The resistivity and the th…
Recent advances in the study of microwave ferrites and garnets have resulted in a better understanding of the relationship between magnetic properties and the fundamental crystal structure. This article presents a review of the way in which the crystal structure of microwave garnets may be designed in order to realize…
The EPR spectrum of O2 impurity in solid N2 has been observed at K band and at X band. The results are consistent with the specific-heat results for this system and indicate that the Σ3 state is split in zero field by 105 ± 15 GHz. A small temperature-dependent splitting of the upper doublet is indicated by the result…
Molecular weights and grafting frequencies of graft copolymers prepared with ferrous ammonium sulfate-hydrogen peroxide initiation showed a dependence on granule swelling similar to that found with ceric ammonium nitrate (increased swelling of starch granules decreased the number of grafted polyacrylonitrile chains an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilk-Like Fiber K-6 (Chinon)S. MorimotoCite this: Ind. Eng. Chem. 1970, 62, 3, 23–32Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Published inissue 1 March 1970https://pubs.acs.org/doi/10.1021/ie50723a006https://doi.org/10.1021/ie50723a0…
Transmission electron microscopy has been used to characterize the microstructure of polycrystalline molybdenum irradiated at elevated temperatures (> 0·3T m). Irradiation at 700°c produces dislocation loops within the grains and denuded zones along grain boundaries, while irradiation at 1000°c results in generally lo…
The ND1 centre is produced in natural and synthetic diamond by primary radiation damage, but only occurs in strength when substantial concentrations of nitrogen are present in the lattice. The optical absorption associated with this centre consists of a sharp no-phonon line at 3.149 ev (80 degrees K) and phonon-assist…
Abstract The “cuticle,” which revests the starfish tube foot, has been studied by electron microscopy and the findings correlated with histochemical observations. The “cuticle” is composed by two distinct zones; an outer zone including numerous microvilli, which extend from the inner zone into and through a fibrillar…
A simple model is presented for studying the impact between a rigid sphere and a thin layer of relatively soft material supported on a rigid substrate. By assuming that the major loss of energy during impact is due to the plastic deformation of the layer, an approximate analysis is made for computing the energy loss f…
Sharp-line luminescence has been observed for ${\mathrm{Re}}^{4+}$ ($5{d}^{3}$) in single crystals of ${\mathrm{Cs}}_{2}$Zr${\mathrm{Cl}}_{6}$ and ${\mathrm{Cs}}_{2}$Hf${\mathrm{Cl}}_{6}$ at low temperature. Well-resolved vibronic structure is seen, forming nearly perfect mirror symmetry between emission and absorptio…
We present a study of the optical absorption spectrum of ErCrO3 as a function of temperature and magnetic field. Three types of processes are observed: (1) creation of a Cr+3 R-line exciton, (2) excitation of the Kramers-split Er+3 single-ion states, and (3) the simultaneous excitation of a Cr+3 exciton and a spin-fli…