Materials Literature
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The low‐temperature (100° to 400°C) tetragonal to monoclinic transformation in yttria‐doped tetragonal zirconia (Y‐TZP) can be inhibited by a postsintering grinding and annealing treatment. The surface region so treated contains fine tetragonal grains which have recrystallized from the severely damaged ground surface.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe kinetics for the reaction of hypochlorite with a manganese(III) porphyrin and subsequent epoxidation of alkenes in a homogeneous solutionRobert W. Lee, Paul C. Nakagaki, and Thomas C. BruiceCite this: J. Am. Chem. Soc. 1989, 111, 4, 1368–1372Publication Date (Print):Febr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular weight distribution of a branched epoxy polymer: 1,4-butanediol diglycidyl ether with cis-1,2-cyclohexanedicarboxylic anhydrideChi Wu, Ju Zuo, and Benjamin ChuCite this: Macromolecules 1989, 22, 2, 633–639Publication Date (Print):February 1, 1989Publication History…
The type and frequency of grain boundaries, the so-called grain boundary character distribution (GBCD), has been determined in rapidly solidified and subsequently annealed Fe-6·5 mass% Si alloy ribbon by the scanning electron microscopy-electron channelling pattern (SEM-ECP) technique. High frequencies of low-angle bo…
The mechanical properties of high‐toughness magnesia‐partially‐stabilized zirconia were found to be dramatically altered by a single cooling cycle between room temperature and − 196°C. Raman spectroscopy and X‐ray diffraction were used to correlate the changes in mechanical properties with structural changes that occu…
Abstract Blends of crystallizable poly(vinyl alcohol) (PVA) with poly( N ‐vinyl‐2‐pyrrolidone) (PVP) made from aqueous solutions appear to be miscible in the whole composition range according to DSC results. A large negative value of the interaction parameter between the two polymers was found from melting point depre…
A computer model that treats ceramic‐powder matrix–ceramic whisker composites as a percolative network of whiskers has been developed. The model calculates the critical fraction of whiskers at the percolation threshold for a two‐dimensional random network of whiskers. The computed critical fraction was found to displa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid crystalline polyethers based on conformational isomerism. 2. Thermotropic polyethers and copolyethers based on 1-(4-hydroxyphenyl)-2-(2-methyl-4-hydroxyphenyl)ethane and flexible spacers containing an odd number of methylene unitsVirgil Percec and Raymond YourdCite th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility and immiscibility of polyamide blendsThomas S. EllisCite this: Macromolecules 1989, 22, 2, 742–754Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February 1989https://pubs.acs.org/doi/10.1021/ma00192a039h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical gels from PVC: aging and solvent effects on thermal behavior, swelling, and compression modulusP. H. Mutin and J. M. GuenetCite this: Macromolecules 1989, 22, 2, 843–848Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published…
We have developed a new microwave plasma torch (MW plasma jet), which can generate a pure H2 plasma jet at atmospheric pressure from the end of a center electrode with an input power above 2 kW. The electric field has maximum strength at the end of the electrodes, so the plasma is initially ignited by the electric bre…
Abstract Studies of lamellar shapes and profiles in linear polyethylene have often been implemented by microscopic examination of appropriately etched random slices through spherulitic specimens. However, since a spherulite crystallized from a bulk specimen is a three‐dimensional assembly of radially oriented lamellae…
Electrochemical noise generation during stress corrosion cracking (SCC) of high-strength aluminum AA(1) 7075-T6 alloy has been investigated in 3.5% NaCl solution under free corrosion potential. The electrochemical noise was observed as spontaneous potential fluctuations. The readings obtained were analyzed using the m…
Abstract Three series of polyurethanes, based on three polyols, diphenylmethane diisocyanate (MDI), and three chain extenders were synthesized. Polypropylene glycol (PPG) soft‐segment length (MW 1000, 2000, and 3000), soft‐segment concentration (30%, 50%, and 70%), and the type of chain extender (ethylene glycol, buta…
Abstract High-resolution transmission electron microscope images of dioctahedral mixed-layer clay structures (illite/smectite) having various substitutional and polytypic schemes were modeled using computer simulation methods. Both one- and two-dimensional calculations were performed using parameters characteristic of…
Structure-property relationships in electronic ceramic materials are reviewed to provide insight into the behaviour of capacitors, thermistors, varistors, and other electroceramic components. Rapid progress in the integration and miniaturisation of ceramic components has led to the development of multipurpose electron…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransmission electron microscopic observation of nascent polypropylene particles using a new staining methodMasahiro Kakugo, H. Sadatoshi, M. Yokoyama, and K. KojimaCite this: Macromolecules 1989, 22, 2, 547–551Publication Date (Print):February 1, 1989Publication History Pub…
X‐ray photoelectron spectroscopy and secondary ion mass spectrometry are used to study the surface chemistry of silicon single‐crystal wafers. Anhydrous and UV/ozone processes modify the surface chemistry by altering the concentration and bonding environments of the most abundant surface atoms: Si, O, C, H, and F. Anh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydroxyapatite formation in a dynamic collagen gel system: effects of type I collagen, lipids, and proteoglycansAdele L. BoskeyCite this: J. Phys. Chem. 1989, 93, 4, 1628–1633Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published ini…
An electroactive polyaniline (PAn) was successfully prepared from nonaqueous propylene carbonate (PC) solution containing acid and electrolyte . PAn deposition and the doping‐undoping process of deposited PAn film were investigated by consecutive cyclic voltammetry in various electropolymerization solutions. It is con…