Materials Literature
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Abstract The application of titanate coupling agents for the surface modification of mica filler and its reinforcement in polypropylene (PP) has been directed towards improvement in mechanical properties. Four titanate coupling agents, namely neoalkoxy tri(dioctylpyrophosphato) titanate (C 1 ), neoalkoxy trineodecanoy…
Acid oxalate reagent was used at various concentrations, pH values, shaking times, and soil to solution ratios to find the optimum conditions for the extraction of Al, Fe, and Si from short‐range‐order materials in soils and stream‐bed deposits. The optimum conditions vary with the nature of the soil sample and its co…
The stress corrosion cracking (SCC) of AISI(1) 304 and AISI 316 austenitic stainless steels in 0.82 kmol/m3 HCl and H2SO4 solutions has been investigated as functions of stress and solution temperature by using the constant load method. It is found that the stress vs time-to-failure curves for both alloys are divided…
Abstract The impact fracture energy ( G c ) for a polypropylene homopolymer and a copolymer with and without calcium carbonate fillers was measured over a range of temperatures between −40°C and 40°C using fracture mechanics principles. The fillers studied were Omyacarb (∼2.7 μm) and Winnofil (∼75 nm) and 10% by weigh…
Abstract Fourier‐transform infrared (FTIR) spectroscopy was used to examine the interactions in miscible blends of a styrene (92%)/acrylic acid (8%) copolymer (SAA8) with poly(methyl methacrylate) (PMMA). From the residue or interaction spectra and shifts of carbonyl and carboxylic acid stretching bands, it is conclud…
The relation between the motion of charges in an electrode gap and the current induced in the external circuit is described on the basis of energy considerations and on the basis of the Ramo-Shockley theory. It is shown that both approaches are applicable, and mutually consistent, not only for gas-filled gaps but, if…
Hole drift mobilities have been measured in films of solid solutions of trans-1,2-bis (9H-carbazole-9-yl) cyclobutane (DCZB) in various polymer binders. The hole drift mobilities differ by more than two orders of magnitude depending on the polymer binder used. In poly (methacrylates) films the hole drift mobility is l…
Abstract N‐substituted maleimides have been investigated as thermal stabilizers for rigid polyvinylchloride (PVC) at 180°C in air by measuring the rate of dehydrochlorination and the extent of discoloration of the polymer. The results reveal the higher stabilizing efficiency of these products relative to basic lead ca…
Electrochromic thin films of polyaniline were prepared by electropolymerization of aniline from an acidic aqueous solution on platinum and conducting glass surfaces. An in situ FTIR spectroelectrochemical technique was used to investigate structural changes of the film during oxidation and reduction. Coloring (oxidati…
The effect of YO 1.5 dopant on unit‐cell parameters of ZrO 2 (YO 1.5 =0 to 14.6 mol%) were examined by the X‐ray whole‐powder‐pattern decom‐position technique. The unit cell of monoclinic ZrO 2 has the largest expansion along the direction perpen‐dicular to (100). The rate of increase of the unit‐cell volume of monocl…
A previously reported lattice-dynamical model of β -cristobalite [Hua, Welberry, Withers & Thompson (1988). J. Appl. Cryst. 21 , 458–465], which assumed the Wyckoff C 9 structure but gave a satisfactory qualitative description of observed diffuse intensity in electron diffraction patterns, is shown to give atomic…
In situ measurements of electrostrictive strain and effective dielectric constant for two ferroelectric relaxor materials, lead magnesium niobate–lead titanate (0.9PMN · 0.1PT) and lead lanthanum zirconate titanate (PLZT 9.5/65/35), were performed in the temperature ranges near their respective mean Curie points under…
Coherent sidebranching of deep cells has been observed experimentally in the vicinity of the cell to dendrite transition. We propose that this phenomenon results from an oscillatory instability of deep cells, where cell widths and tip positions oscillate coherently in phase. We perform a linear-stability analysis of a…
Compositions to yield solid solutions were prepared by coprecipitation and firing. Fine active clusters of nickel were obtained by reduction. Phase changes were followed by thermal analysis, X‐rays, electron microscopy, surface area measurements, and reforming methane with CO 2 . Nickel on periclase remained active ov…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of pressure on crystallization in poly(ethylene terephthalate)P. J. Phillips and H. T. TsengCite this: Macromolecules 1989, 22, 4, 1649–1655Publication Date (Print):April 1, 1989Publication History Published online1 May 2002Published inissue 1 April 1989https://pub…
We consider a semi-flexible chain adsorbed on a wall by a constant external field, h , or a short-range surface potential, V s . When the amplitude of h or V is decreased the system undergoes an unbinding transition; the properties of such transitions are studied here through various analytical and numerical methods (…
Using a new experimental technique, we have measured the fourth moment of the current distribution in two-dimensional random resistor networks. The fourth moment is proportional to relative resistance fluctuations in a network of noisy resistors, and, until now, noise measurements provided the only experimental probe…
Abstract Synchrotron x‐radiation has been used to follow the development of low‐angle diffraction in sharp fractions of polyethylene. The polymer is shown to crystallize in very thin lamellae which rapidly thicken in a single step to twice, three times, or four times the original thickness. This dramatic refolding is…
An in situ study of prismatic glide in beryllium is made to provide a simple model for understanding the anomalous increase in elastic limit as a function of temperature. This effect is also observed in several ordered alloys such as superalloys. In this paper, Part I, the mechanism controlling the deformation is stud…
A glucose dehydrogenase gene was isolated from Bacillus megaterium IWG3, and its nucleotide sequence was identified. The amino acid sequence of the enzyme deduced from the nucleotide sequence is very similar to the protein sequence of the enzyme from B. megaterium M1286 reported by Jany et al. (Jany, K.-D., Ulmer, W.,…