Materials Literature
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Kin-ichi Sakurai, Hisanobu Wakita, Akira Kato, Kozo Nagashima; Chemical Studies of Minerals Containing Rarer Elements from the Far East. LXIII. Bastnaesite
Abstract The reactions of peroxides with polymers have been studied for some time. They form an extensive part of vulcanization technology. Two types of reactions are generally recognized, those leading to crosslinking between polymer chains and those leading to scission of the chains. Natural rubber, polybutadiene an…
Mechanical properties of single crystals of niobium have been measured in the strain-rate range 103-104 see−1 where flow is thermally activated and is probably controlled by the Peierls stress. Dislocation configurations and densities have been measured as a function of strain at strain rates of 6·5 × 103 sec−1 and 2·…
Phase equilibria were determined by standard quench methods in binary systems NIO‐B 2 O 3 , the binary join Li 2 O.B 2 O 3 ‐NiO, and three other sections through the Li 2 O.B 2 O 3 ‐B 2 O 3 ‐NiO system. The only new compound observed was 2NiO.B 2 O 3 , which is stable from 1303° to 1480°C.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymeric Schiff BasesJ. H. Hodgkin and J. HellerCite this: Macromolecules 1969, 2, 5, 556–558Publication Date (Print):September 1, 1969Publication History Published online1 May 2002Published inissue 1 September 1969https://pubs.acs.org/doi/10.1021/ma60011a023https://doi.org…
The ac magnetostriction of transformer sheet has been measured with longitudinal compression up to 2000 lbf/in2(13 800 kN.m-2). Longitudinal stress causes a sudden increase in magnetostriction, while normal stress smooths out the steplike change. Si-Fe sheet from three different manufacturers is shown to have widely v…
Following the suggestion of Scaife that the complex polarizability data ought to be used for comparing dielectric dispersion data, we constructed the mechanical analogue of the complex polarizability. The parameters used to represent the relaxation data of poly( n -hexyl methacrylate) in the two forms were determined.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular structure of diazulenetetrairon decacarbonyl in crystalline (C10H8)2Fe4(CO)10.C2H4Cl2Melvyn R. Churchill and Peter H. BirdCite this: Inorg. Chem. 1969, 8, 9, 1941–1949Publication Date (Print):September 1, 1969Publication History Published online1 May 2002Published…
Abstract Six homologs of the cellulose triester series were found to exhibit, in general, three second‐order transitions as determined dilatometrically. A parallel study of torsional modulus versus temperature revealed one glass–rubber transition, which allowed molecular assignment of one of the above. The dependence…
Abstract A combination of electron‐microscopy, light‐scattering, and stress‐birefringence studies on chemically crosslinked polyurethanes point toward the existence of rodlike regions (“bundles”), approximately 3000–8000 Å in length and involving about 5% of the volume, in which molecular orientations are correlated.…
Abstract The effect of titanium compounds on thermooxidation stability of stabilized polypropylene was studied. It was found that the presence of titanium compounds shortens the induction period of PP oxidation. This phenomenon is brought about by the thermal reactions of titanium compounds with antioxidants which tak…
Surface elastic waves have been generated at 60 MHz by magnetostrictive coupling in yttrium iron garnet (YIG). The transducers were evaporated aluminum meander lines. For a YIG plate with the (110) axis normal to the free surface and propagation along the (001) axis, maximum coupling occurred for the static field para…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsothermal diffusion in some two- and three-component systems in terms of velocity correlation functionsD. C. Douglass and H. L. FrischCite this: J. Phys. Chem. 1969, 73, 9, 3039–3047Publication Date (Print):September 1, 1969Publication History Published online1 May 2002Publ…
A polymer crystal with a noncrystalline surface layer formed by chain loops of different lengths is considered. It is assumed that the length of each loop can be changed by longitudinal diffusion of the molecule through the crystal lattice. From the condition that the free energy of the system is minimum, the loop len…
The behavior of stable cylindrical domains, under variations in temperature, has been studied in a number of the rare-earth orthoferrites from the point of view of the need for temperature control when these materials are used in propagating domain devices. Fractional changes in domain diameter from -0.60 percent/°K i…
The fracture toughness of A533 steel at room temperature, 0 deg and −70 deg F, was evaluated with 1 and 2-in-thick contoured double cantilever beam (DCB) specimens. To establish the effect of rate on thickness requirements, and to assess the strain rate sensitivity of KIc both initiation and arrest toughnesses were me…
Abstract The influences of conditioning treatments and surface topography on the heparin adsorptivity and the thromboresistance of a high‐strength, impermeable, isotropic, pyrolytic carbon were investigated. The results of the adsorption studies indicate that the adsorption of heparin on such carbon surfaces is near t…
The recoveries of activity in the presence of mixtures of several enzymes and a cellular debris were compared with the recoveries of the pure enzymes. In the acid-dissociation experiments, no interference from foreign proteins was observed nor were any cross hybrids between subunits of different enzymes found. This su…
Abstract Incongruent dissolution of aragonite and magnesium calcite
Both semiconductors and magnetic materials exhibit interesting properties that can be used in electronic devices. A material that combines these properties, i.e., a magnetic semiconductor, could show interesting cross effects, such as a large magnetoresistance, or hysteresis and the associated memory phenomena introdu…