Materials Literature
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Abstract Mathematical models developed describe the unfolding of polymeric crystals in the presence of a solvent followed by their subsequent disentanglement. A thermodynamic model considering the free energy changes during crystal unfolding was proposed to obtain an expression for the unfolding rate. A simplified ver…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTProperties and Crystalline Structures of Syndiotactic Poly(propylene-co-1-butene)Naofumi Naga, Kooji Mizunuma, Hajime Sadatoshi, and Masahiro KakugoView Author Information Petrochemicals Research Laboratory, Sumitomo Chemical Co. Lt…
Abstract There has been much interest in the rare specimen of beidellite from the Black Jack Mine, Florida Mountain, Idaho. A variety of aluminous clays exists along veins such as the Black Jack vein, in rhyolite and latite flows, and in near-surface ash beds, often containing less than 1.0% MgO and 0.5% Na 2 0. Assoc…
The static and dynamic properties of three randomly branched systems under good solvent conditions have been investigated by light scattering. Despite large differences in the topology and chemical structure of these systems one common scaled particle scattering function ( P ( qR g )) is obtained for the probed q rang…
This paper describes the development of an automated sample translatory type apparatus capable of measuring the magnetocaloric effect of potential magnetic refrigerants over the temperature range 10 to 325 K in applied fields of up to 9 T. A Quantum Design® Physical Property Measurement System has been used as the hos…
Abstract The use of intrinsically conductive polymers in welding of plastics and composites offers the possibility of developing new welding methods. Intrinsically conductive polyaniline (PANI) composite gaskets were used to microwave weld high density polyethylene (HDPE) bars. Two composite gaskets were made from a m…
Abstract Deactivation of free radicals, hydroperoxides and harmful solar radiation are the principal mechanisms increasing stability of commodity and engineering polymers. The stabilization process is accompanied by transformations of individual additives. New compounds influence specifically the integral protecting m…
The flexoelectro-optic effect in short-pitch cholesterics [1] is analysed in terms of applied electric field strengths and material parameters such as the two flexoelectric coefficients es and eb and the three elastic constants. Starting from the free energy density of the uniformly lying-helix (ULH) configuration, in…
The electrical and superconducting properties of hexagonal alkali tungsten bronzes A x WO 3 (A = K, Rb, Cs) were examined by calculating the electronic band structure of a representative hexagonal tungsten bronze and analyzing reported crystal structures of A x WO 3 (A = K, Rb, Cs). These bronzes possess one-dimension…
Dielectric and piezoelectric properties of 0.02Pb(Y 2/3 W 1/3 )O 3 0.98Pb(Zr0.52Ti0.48)O3 ceramics doped with additives (Nb 2 O 5 , La 2 O 3 , MnO 2 , and Fe 2 O 3 ) were investigated. The grain sizes of these ceramics decreased with increasing amounts of additives. For additions of MnO 2 and Fe 2 O 3 , dielectric los…
A study has been made of Hertzian contact damage in porous and dense liquid‐phase‐sintered aluminas. Indentation stressstrain curves show increasing nonlinearity as the materials become more porous, illustrating an increasing component of “quasi‐plasticity” in the contact damage. Observations of the surface and subsur…
The cellulose synthesis inhibitor 2,6-dichlorobenzonitrile (DCB) and the DCB analogs 2-chloro-6-fluorobenzonitrile, 3-amino-2,6-dichlorobenzonitrile, and 5-dimethylamino-naphthalene-1-sulfonyl-(3-cyano-2, 4-dichloro)aniline (DCBF) inhibited extracellular adhesive production in the marine diatom Achnanthes longipes, re…
This paper introduces the concept of JetRing spinning, a new spinning technique that incorporates features of both ring and air-jet spinning systems. In JetRing spinning, a single air jet is used below the yarn-forming zone of a conventional ring spinning system; this jet acts in a way similar to the first jet in air-…
The isothermal isotopic exchange reaction of 18 O 2 with 16 O of chromium(VI) oxide supported on zirconia, alumina, and titania has been investigated with in situ laser Raman spectroscopy. The isotopic exchange reaction is dependent on the support type, the Cr loading, and the reaction temperature. Complete isotopic e…
The complexation of poly(styrene- co -vinylphenol) (STVPh) and poly(styrene- co -vinylpyridine) (STVPy) in nonaqueous solution was investigated with emphasis on the effect of the hydroxyl and pyridyl contents in the component polymers. Viscometry, nonradiative energy transfer fluorospectroscopy, and dynamic laser ligh…
The influence of N‐heterocyclics, viz. imidazole (IA), benzimidazole (BIA) and 2‐methyl imidazole (MIA) on the corrosion and hydrogen permeation through mild steel in 1 N H 2 SO 4 and in 1N HC1 has been studied using weight loss and various corrosion monitoring techniques. Imidazole and benzimidazole inhibit the corro…
The paper introduces a new physical approach to account for the effect of reduced air density on the flashover voltage and critical leakage current of polluted high voltage insulators. The analysis starts by updating the mathematical model, previously established, of power frequency flashover of polluted insulators at…
Homopolymers of 1,4,8-trioxa[4.6]spiro-9-undecanone (TOSUO) and block copolymers of TOSUO and ε-caprolactone (ε-CL) have been synthesized with aluminum isopropoxide as an initiator in toluene at 25 °C. The homopolymerization is first order with respect to both monomer and initiator, and the end-group analysis agrees w…
The absorption and conduction currents in synthetic insulating polymers, viz., polyethylene, polypropylene, polyethylene-terephthalate and polyvinylidenefluoride, with dc fields may be electronic or ionic both and it may be difficult to determine their origins unambiguously. The charges which are present in the bulk o…
A theory has been developed to calculate microstreaming velocity inside and outside an isolated air bubble in a liquid produced by a bubble-scattered sound field, taking account of two predominant modes of the bubble’s motion: a monopole (pulsation), and a dipole (translational harmonic vibrations). It has been demons…