Materials Literature
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Abstract The relations between the adjoint group and the additive group of a radical ring and its nilpotency are investigated. It is shown that certain finiteness conditions carry over from the adjoint group to the additive group and that the converse holds for the class of minimax groups.
We describe the effects of yarn twist on the structure, properties, and production of a T/C composite yarn. The results show that yarn twist in the special structure of a composite yarn is very critical, and good properties of 19.7 tex T/C composite yam such as high skein strength, good abrasion resistance, and low ir…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDescription of Phase Behavior of Polymer Blends by Different Equation-of-State Theories. 1. Phase Diagrams and Thermodynamic Reasons for Mixing and DemixingBernd Rudolf and Hans-Joachim CantowCite this: Macromolecules 1995, 28, 19, 6586–6594Publication Date (Print):September…
Abstract The sodium salts of carboxylic acids and other weak acids are routinely used as nucleation agents for injection moldable poly(ethylene terephthalate) (PET) resins. One of the primary drawbacks accompanying their use is the degradation of the PET resulting from the attack of the ester by the sodium carboxylate…
Abstract Activated carbons were prepared by ZnCl 2 /CO 2 activation of the chips of oil trunk. The surface area and the nature of the porosity of the resulting activated carbons were found to be related to the concentration of the impergnated zinc solution to the precursor. It is possible to prepare activated carbons…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiodegradation of the cross-linked cationic poly(amino acid) hydrogels by proteolytic enzymesHiroyuki Yamamoto and Yuuki HirataCite this: Macromolecules 1995, 28, 20, 6701–6704Publication Date (Print):September 1, 1995Publication History Published online1 May 2002Published i…
We present a new method to determine the Flory–Huggins polymer–polymer interaction parameter and self- (or tracer) diffusion coefficients in a ternary polymer solution made of two monodisperse polymers and a solvent by quasielastic light scattering (QELS). Previously proposed methods based on the random phase approxim…
The shrinkage process of large pores during hot isostatic pressing (HIP) of presintered Al 2 O 3 and Al 2 O 3 ‐ZrO 2 ceramics has been investigated. Large pores were observed to collapse by grain‐boundary sliding, and then small pores resulting from the misfit of flowed grains disappeared, mainly by diffusion. Due to…
Abstract Recent developments in characterization techniques have permitted estimation of the crosslink density attained in dynamically vulcanized thermoplastic elastomers. The range of techniques available for investigation of the phase morphology of this type of TPE has also increased. The characterization of experim…
Article The Role of Macromolecular Entanglements in the Gel Spinning Process and Properties of High Performance Polyacrylonitrile Fibers was published on September 1, 1995 in the journal Journal of Polymer Engineering (volume 15, issue 3-4).
Scattering of a two-dimensional, spatially partially coherent electromagnetic field by a two-dimensionally-modulated microstructured medium is treated exactly by means of the coherent-mode representation of the cross-spectral density tensor and a rigorous diffraction theory for fully coherent fields. An explicit metho…
Abstract The Carrión lacustrine basin (≈10 km 2 ), central Spain, is filled with Neogene-Quaternary sediments (20–25 m thick) rich in palygorskite. Two clay units of ∼15 m thick are of particular interest in the basin. The lower one contains over 75% phyllosilicates (palygorskite up to 90%, smectites and illite) in ma…
Electric impedance of nematic liquid crystal (5CB) cells has been measured to detect ion behavior. The experimental and theoretical results show that a single type of ion carries a current in 5CB. The thickness of double layer at the surface becomes thinner with decrease in the frequency.
Particulates and fibers of ≤10 μm dimensions are important in many human–environment interactions. Two examples are asbestos fibers in the lung and particulate generation from orthopaedic implants. In this article, methods of producing fibers made from evaporated metal and oxide films using microfabrication techniques…
Abstract Taking into account the coordination chemistry of divalent palladium and nickel, two new cellulose solvents have been developed. Pd‐en is an aqueous solution of the ethylenediamine palladium complex [(en)Pd(OH) 2 ]. Low molecular diols are deprotonated twice in Pd‐en and form a five membered chelate ring with…
Mit „nackten”︁ Fluorid‐Ionen – eingesetzt als Tetramethylammonium‐ oder 1,1,3,3,5,5‐Hexamethylpiperidiniumfluorid – gelingt die Synthese des Fluorocarbonats (Fluorformiats) [FCO 2 ] – . Dieses Anion hat eine außerordentlich schwache C‐F‐Bindung. Zu seiner Charakterisierung dienten 13 C‐Festkörper‐NMR‐, IR‐ und Raman‐S…
Luminescence spectra and their variation with temperature have been investigated for solid films of poly(methylphenylsilane) and its branched analogs. Introduction of branching points to the polymers enhances the broad luminescence band in the visible region while suppressing the sharp UV luminescence band due to the…
Abstract Tribological studies have been carried out on Nylon 6,6 with particular emphasis placed on the examination of the effect of water on this polymer. An examination of the sliding frictional behaviour of Nylon 6,6 against a steel substrate shows that the friction decreases with increasing load, probably due to t…
A method is presented that allows the calculation of phase diagrams (spinodal, binodal, and tie lines) of quaternary mixtures on the basis of the Gibbs energy of mixing ΔG. No derivatives of ΔG with respect to the composition variables are required. This method is particularly useful in cases where the composition dep…
The effects of a long-range repulsive interaction on the phenomena of Ostwald ripening are studied. Beginning with a Langevin description, interface equations describing both the growth and motion of droplets are derived and solved numerically. Two noncoarsening and one coarsening regimes are found. In the noncoarseni…