Materials Literature
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Abstract Insertion poly(methyl acrylate) and poly(methyl methacrylate) were prepared from monomers adsorbed in monolayers on the surface of montmorillonite clay, both in the presence and in the absence of bifunctional crosslinkers (ethylene glycol dimethacrylate and tetramethylene glycol dimethacrylate). The insertion…
The kinetics of the highly endothermic reactions between carbon and silica were investigated quantitatively for four compressed powder silica-carbon systems and for one charred, silica-reinforced, phenolic resin system. Measurements were made in the temperature range 1300°-1600°C. The reaction kinetics data obtained w…
The transmission characteristics of Fabry-Perot type aluminum-magnesium fluoride-aluminum interference filters for the wavelength region 1700 A to 2400 A are described. Typical peak transmissions of 0.25 with bandpasses <300 A are obtained with first-order filters on fused silica substrates. Secondorder filters give n…
In the ordered MnAl crystal containing magnetic atoms which are coupled ferromagnetically, stacking faults are postulated through which an antiferromagnetic coupling exists between the atoms on either side of the fault. These account for the anomalous magnetic behavior of fine MnAl powder. Such faults give rise to a d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Solution to the Structural Dilemma of Co4(CO)12Based on Valence Tautomerism and Steric NonrigidityF. A. CottonCite this: Inorg. Chem. 1966, 5, 6, 1083–1085Publication Date (Print):June 1, 1966Publication History Published online1 May 2002Published inissue 1 June 1966https:…
It is shown that the well-known Erginsoy's formula for scattering of electrons by neutral impurity is not valid for the electron scattering by neutralized acceptors in germanium or silicon. An alternative formula based on the positron-hydrogen scattering picture is presented and compared with the cyclotron resonance o…
Abstract Observation of optical interference fringes at the tip of a crack in a glassy polymer allows the construction of the configurations of the crack tip and the craze that precedes it. The craze extends 25 μ beyond the crack tip in poly(methyl methacrylate) and 550 μ beyond the tip in the polystyrene studied. The…
A method is presented for calculating the isotropic elastic moduli of ceramic powder from the compressibility and the Debye temperature. Young's and shear moduli of polycrystalline MgO, Al 2 O 3 , BeO, and TiO 2 were computed from compressibility and Debye temperature data by the present method and compared with value…
Crop loss due to soil salinization is an increasing threat to agriculture worldwide. This review provides an overview of cellular and physiological mechanisms in plant responses to salt. We place cellular responses in a time- and tissue-dependent context ...Read More
Two methods used to synthesize high‐purity ferroelectric titanate powders in controlled, narrow size distributions, with average particle diameters <1000 A, were: (1) isothermal pyrolysis of barium titanyl oxalate or mixed calcium‐barium titanyl oxalates as low as 550° and 825°C, respectively, average particle size…
The cell wall of the freshwater diatom Navicula pelliculosa (Bréb.) Hilse is composed of the silica shell and an organic skin which surrounds it. Isolated skins can be prepared by first removing the contents of the cell by mechanical shaking, followed by a posttreatment of these isolated cell walls with HF vapor to re…
Abstract A melt can readily solidify to a glass with a three‐dimensional or two‐dimensional network, or a chain structure, provided that an irregular bonding system can be formed by virtue of free rotation about the bonds between a central atom and the ligands which function as bridging atoms. Such an irregular struct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkylation of Isobutane with 1-Butene Using Sulfuric Acid as Catalyst at High Rates of AgitationJ. F. Mosby and L. F. AlbrightCite this: Ind. Eng. Chem. Prod. Res. Dev. 1966, 5, 2, 183–190Publication Date (Print):June 1, 1966Publication History Published online1 May 2002Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties and Applications of trans-1,4-PolyisopreneE. G. Kent and F. B. SwinneyCite this: Ind. Eng. Chem. Prod. Res. Dev. 1966, 5, 2, 134–138Publication Date (Print):June 1, 1966Publication History Published online1 May 2002Published inissue 1 June 1966https://pubs.acs.org…
Experimental results are reported on the formation of deformation twins in rhenium single crystals, deformed in tension at room temperature. The twinning shear is large (∼0·6), in agreement with some earlier results for similar twins in zirconium. Low shear twins of the type, which are generally a feature of the defor…
Heterogeneity effect on multilayer composite cylindrical shell stability under axial compression
Abstract Commercial thermoplastics may be classified by the types of rate curves obtained on thermal oxidation. The rate of oxidation of an acrylonitrile‐butadiene‐styrene plastic is affected by sample thickness and appears to be diffusion‐controlled. Pigmentation increases the reaction rate of this compound in all th…
Seeding of supercooled polyethylene melt and solution with extended chain single crystals did not markedly decrease the degree of supercooling necessary to initiate crystal growth.induced with these nuclei.An analysis of the first traces of crystal growth allowed some conclusion about nucleation and growth mechanism.I…
Rods impacting a rigid target at velocities sufficient to produce several percent axial strain are found to buckle plastically with a fairly reproducible wavelength. This phenomenon is investigated for materials which exhibit strain-hardening, a property which is crucial to the theory. The buckling motion is treated a…
Abstract Replicas of fracture surfaces of fractions of linear polyethylene, which were crystallized at elevated temperatures for extended time periods, were examined by electron microscopy. Striated. lamella‐type crystallites were observed for all molecular weights over the range 3.2 × 10 3 −5.7 × 10 5 . In agreement…