Materials Literature
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Abstract The anionic polymerization of a bridged bicyclic lactam, 2‐azabicyclo[2,2,1]heptan‐3‐one (ABHO), was carried out in bulk and in solution under various reaction conditions. In general bulk polymerization of ABHO was superior to solution polymerization in conversion and degree of polymerization. The resulting p…
Abstract At low temperatures TbPO 4 undergoes two successive phase transitions. Antiferromagnetic ordering along the tetragonal c ‐axis at T N1 = 2.28 K is followed below T N2 = 2.13 K by a structure of lower symmetry where the moments are tilted off the c ‐axis by about 20°. The B‐T phase diagram ( B along c ) is det…
The physical properties of cotton and polyester/cotton blend yams sized with several two-component size formulations were evaluated. The sizing systems included starch/polyvinyl alcohol, starch/polyester, and polyvinyl alcohol/polyester. The yams were evaluated by means of tensile tests and by measurements of rupture…
The minimal conditions under which a surface mode of the Bleustein–Gulyaev type can be made to propagate in a ferromagnetic substrate are established within the framework of a fully nonlinear, rotationally invariant, and thermodynamically admissible continuum theory of deformable ferromagnets. It is sufficient that th…
A ternary metal-nucleotide complex, Na2[Cu(5’-IMP)2(im)o,8(H20)l,2(H20)2h]as~ 1be2e.n4 pHr2ep0a,r ed and its structure analyzed by X-ray diffraction (5’-IMP = inosine 5’-monophos hate; im = imidazole). The complex crystallizes in space group C222, with a = 8.733 (4) A, b = 23.213 (5) A, c = 21.489 (6) 1, and Z = 4. Th…
The question of coexistence of cubic-to-tetragonal structural transition and both paramagnetic-to-ferromagnetic and -antiferromagnetic transitions in a twofold-degenerate band is studied under the Hartree-Fock approximation of the Hubbard Hamiltonian. The phase diagrams for both the transitions have been worked out at…
Abstract Copolymers from styrene and a mixture of p ‐ and m ‐chloromethylstyrene were reacted with sodium cyclopentadienide in THF and precipitated in methanol at temperatures lower than −20°C to obtain soluble cyclopentadienylated polymers. Due to extensive gelation, the content of cyclopentadienyl groups could not b…
Abstract The kinetics of the thermal cis-to-trans isomerization of N,N′-diacylindigos(DAI) in various solvents and under high pressures has been studied. N,N′-Dibenzoylindigos(DBI) isomerize about 10 times slower than molecules not having a benzene ring in the acyl groups. The values of the activation volumes were abo…
Abstract The studies of the rapid precipitation of magnesium hydroxide, from aqueous solutions of different concentrations by sodium, calcium and ammonium hydroxides, are analysed. The kinetics of nucleation and microcrystallite formation during the induction periods and the kinetics of crystal growth (onto the microc…
Single crystals of hydrogen bis(phthalo-cyaninato)neodymium(III) have been synthesized by electrochemical means. The crystals are semiconductors and follow Curie-Weiss behavior.
It has been suggested that the sigma phase and its preliminary phases are responsible for intergranular corrosion of molybdenum-containing austenitic stainless steels in such environments as 65 wt% boiling nitric acid when the material is heat treated or when ferrite is introduced by welding. In this paper, data obtai…
Negative corona discharge from multiple interacting points has been investigated with emphasis on the role of negative streamers in causing spark breakdown. The interaction among the evenly spaced bright discharge spots existing along a negative corona wire was simulated with a multiple point electrode whose point-to-…
An account is given of a study of the dimensional changes of plain weft knitted fabrics made from 12s, 16s, and 22s grasicrimp yam, brought about by various processes of relaxation including dry relaxation, wet relaxation, and tumble drying. In the dry relaxed state, the nature of knitted loop depends on the yarn's ph…
Abstract Using previously published data and a few new data the compositions of protopyroxene, orthopyroxene, and pigeonite, coexisting with liquid in the system CaO-MgO-SiO 2 , are reviewed and shown to depend subtly on the number and nature of the coexisting phases such as forsterite, silica, other pyroxene, and liq…
Hydroxyl terminated natural rubber (HTNR) was prepared by the depolymerization of masticated natural rubber in the presence of H2O2 in toluene. Probable mechanisms leading to the formation of side reaction products are proposed based on the analytical data. A comparative study of some formulation variables was made fo…
The effect of an electric field on the measured order parameter of a liquid crystal is considered. It is pointed out that an external field may influence the apparent degree of order by changing the microscopic order parameter, and by quenching director fluctuations. In nematic liquid crystal the latter dominates, but…
(TMPTF)2SbF6 shows an anomaly on the temperature dependence of its electrical conductivity at 154K and at low temperature an antiferromagnetic ground state. On the other hand (TMTTF)2AsF6 ground state is non-magnetic. He present the spectroscopic and magnetic studies of these two salts and of their alloys (TMTTF)2 (Sb…
The origin of the dark region in LPE grown GaP crystals associated with macrostep is investigated by observation of photoluminescence (PL) image and spatially resolved photolumenescence (SRPL) spectroscopy. PL image from the cleaved surface of undoped, N, S, and Zn doped layers showed that the dark region appeared onl…
Abstract Bubble distribution in shaped sapphire crystals grown by Stepanov technique is found to depend on the field of velocities of the melt flows between the top surface of a die and the crystallization front. A die design defining the flows in the meniscus is a tool for control over the bubble distribution.
Three luminescence transitions in the 476 nm excited spectrum of Cs2NaTmCl6 between 7200–4100cm-1 are assigned to the 3 H 4 → 3 F 4, 3 H 5 and 3 F 4 → 3 H 6 transitions of TmCl3- 6. A crystal field analysis of the energy levels of this anion is given.