Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntrazeolite site-selective far-IR cation probeGeoffrey A. Ozin, Mark D. Baker, John Godber, and Caroline J. GilCite this: J. Phys. Chem. 1989, 93, 8, 2899–2908Publication Date (Print):April 1, 1989Publication History Published online1 May 2002Published inissue 1 April 1989h…
Abstract Amino resins can be applied as well materials for the microencapsulation of drugs, agrochemicals, adhesives, and dyestuff systems for pressure‐sensitive copying paper. The microencapsulation is carried out with unmodified or modified, etherified or non‐etherified amino resins, in most cases with addition of w…
Time evolution of domain patterns in a quenched ferroelectric triglycine sulphate (TGS) crystal is investigated in real time and in real space. The effect of applying an electric field after quenching is studied. The characteristic length, defined as a mean domain width, is found to obey the power law with respect to…
Anodic alumina films prepared in phosphoric, oxalic, sulphuric and chromic acids have been examined using magic-angle spinning nuclear magnetic resonance. Whilst only hexacoordinated aluminium is observed in films formed in chromic acid, tetra-, penta- and hexacoordination is observed in films formed in oxalic and sul…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of ring strain and steric hindrance in a new method for the synthesis of macrocyclic and high-polymeric phosphazenesIan Manners, Geoffrey H. Riding, Jeffrey A. Dodge, and Harry R. AllcockCite this: J. Am. Chem. Soc. 1989, 111, 8, 3067–3069Publication Date (Print):April…
Abstract The tensile drawing behavior of poly( L ‐lactide) has been studied in order to obtain high strength fibers. Elongational viscosity measurements indicated that the hot drawing can take place in two temperature regions with different activation energies. Up to 180°C, the deformation proceeds in the semicrystall…
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…