Materials Literature
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Triboelectric charging of hair modified by surface deposition of a series of monomeric and polymeric long alkyl chain quaternary ammonium salts was examined. The length of the hydrophobic alkyl chain in both monomeric and polymeric surfactants, the composition of copolymer-containing surfactant and nonsurfactant units…
Nylon 6, nylon 66, and poly(ethylene terephthalate) (PET) fibers were subjected to superheated steaming. The effects of a small amount of water vapor in superheated steam on the fine structure and dyeing behavior of the fibers were examined at varying steaming temperatures by measuring shrinkage, crystallinity, crysta…
UV‐visible, infrared, and Raman spectroscopic studies have shown that little to weak interactions occur between the halogens , , and or the interhalogens , , , and , and . The degree of dissociation of the interhalogens in have been determined to be similar to those in the nonpolar medium of . Cyclic voltammetric stud…
Testing cables in the field requires a specialized knowledge of dielectric behavior, electrical stress phenomena, safe and proper use of test equipment, and interpretation of test results. Theoretical and practical aspects of high-potential field testing of medium- and high-voltage extruded cables are discussed. The f…
The mechanical properties of ferrite filled thermoplastics at high filler loadings of 75-85% by weight are reported. Barium ferrite was used as the filler in the magnetic polymeric composites. Three types of thermoplastic elastomers, namely, styrenic, polyester-ether, and polyurethane were investigated as matrix mater…
Abstract Further studies have been carried out on the thermal behaviour of partially neutralized poly(acrylic acid), using ammonium or sodium ions as the neutralizing species. It was found that, unlike the partial poly(acrylates) of lithium, sodium or potassium, partially neutralized ammonium poly(acrylate) did not un…
The site preference of iron and cobalt atoms in Nd2(Fe,Co)14B and the local magnetic properties are examined by Mossbauer spectroscopy for specimen of (Fe1-xCox)75Nd16.5B8.5(x= 0\sim1). From the measurement of relative intensities of resonant57Fe nuclei in the six sites, it is concluded that iron atoms preferentially…
Calculations of field components for thin-film recording heads originally done with the finite difference method on a desktop computer were redone using a mainframe computer. The new computations agree much better with experimental results and give simpler, more accurate coefficients for the equations previously publi…
Precision measurements of the dispersion relations for phonons along the high-symmetry directions in gamma -Sn (Sn 0.8 In 0.2 ) have been performed at room temperature by inelastic neutron scattering. Phonon group velocities have been extracted from the data with an accuracy of 5-10%. Several abrupt changes of group v…
Abstract There is increasing demand for high temperature greases capable of operating in the range of 175–235°C. In this paper, one type of grease, polyurea, is described, and its preparation given, in terms of raw materials, temperature, solvents, base fluids including synthetics, catalysts, additives and thickeners.…
Many articles of protective clothing have become quite expensive, and consequently, there is need for reuse of those articles. One concern, however, is whether the articles require decontamination if they are splashed by a liquid or contact a hazardous gas. Concerns over contamination involve two important aspects: 1)…
Abstract Two types of polypyrazoles, unsubstituted and phenylated, were prepared by a novel synthetic route involving the cyclopolycondensation of aromatic dihydrazines and aromatic dipropynones. The polymers had inherent viscosities as high as 1.05 dL/g and were soluble in N, N ‐dimethylacetamide, chloroform (phenyla…
A new model for describing hysteresis is proposed. The magnetization is separated into reversible and irreversible parts. The irreversible part is described by a new extended Preisach diagram and the reversible part by a Langevin function. Satisfactory agreement with experiment has been obtained.
The 270 nm absorption spectra of thioformamide, CHSNH 2 and CHSND 2 , have been photographically recorded under conditions of long path length (88 m) and moderate resolution (7.5 Å/mm). The absorption was assigned to the electron promotion, n S → π* (CS), and to the electronic transition, [Formula: see text]. The spec…
High-resolution adiabatic calorimetry has been used for the study of the liquid_crystal phase transitions in mixtures of 4-n-hexyloxyphenyl-4″-n-octyloxybenzoate (), 4-n-hexyloxy-phenyl-n-decyloxybenzoate () and 4-n-hexyloxyphenyl-4″-n-dodexyl-oxybenzoate () with emphasis on the vicinity of the NAC (nematic-smectic A-…
N‐Trifluormethylformamid 1 bzw. das Hexahydropyrrolo[3,4‐d]imidazol 2 sind die Produkte der Titelreaktionen. 1 ist eine bei 116°C unzersetzt destillierbare Flüssigkeit und liegt im Unterschied zu N‐Methylformamid in unpolaren Solventien bevorzugt als E‐Isomer vor. Die praktisch quantitative Bildung von 2, dessen Struk…
Abstract Thirty‐five PVC formulations were compounded initially from which selected nontoxic formulations were subjected to studies in changes of mechanical, optical, migratory, viscosity, and toxicity properties due to gamma irradiation to 2.5 M rads. Degree of discoloration was found to vary from negligible to inten…
A mathematical treatment of the electrochemical method of hydrogen permeation is presented which gives an equation more comformable to the experimental permeation‐time transients. To verify the equation, a set of permeation‐time transients of steel membrane under various potential was determined. The meanings of the p…
Abstract The identification of office copier machines has been simplified by the computerization of their class characteristics. The class characteristics examined are paper type, type of toner, reduction/enlargement capabilities, paper supply, presence of identifying marks, fusion method, and color capabilities. Thes…
Abstract Novel poly(enonsulfides) were prepared with inherent viscosities as high as 1.35 dL/g by nucleophilic addition of various aromatic dithiols to 1,1′‐(1,3‐ or 1,4‐phenylene)bis(3‐phenyl‐2‐propyn‐1‐one) in m ‐cresol at 25–40°C. A tough clear yellow film with a tensile strength of 11,300 psi and a tensile modulus…