Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphological variations in polymer blends made in electric fieldsGanesh Venugopal, Sonja Krause, and Gary E. WnekCite this: Chem. Mater. 1992, 4, 6, 1334–1343Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibration between the fluorescent and zwitterionic phantom states in alkyl-substituted tetraphenylethylenesJangseok Ma and Matthew B. ZimmtCite this: J. Am. Chem. Soc. 1992, 114, 24, 9723–9724Publication Date (Print):November 1, 1992Publication History Published online1…
Abstract Polyamide‐6 (PA‐6) and sulfonated polystyrene (SPS) interact strongly in solution. Thus, solution blends of PA‐6 and SPS (sulfonation levels from 0 to 12.3 mol%) in m ‐cresol form clear, hazy, or gelled solutions–depending on the ratio of amide (A) to sulfonic acid (S) groups (A/S). NMR studies show that the…
Abstract Foam extrusion of a series of dynamically vulcanized polypropylene (PP)/ethylene-propylene-diene terpolymer (EPDM) blends (commercially available Santoprene) by using chemical blowing agents have been studied. Results suggest that foaming occurs only within the thermoplastic phase and for each composition the…
Measurements of spin-resolved elastic electron-sodium scattering have been carried out at incident energies of 4.1 and 12.1 eV, and the ratio of triplet to singlet scattering cross sections has been obtained at each energy. The ratio is used to provide a determination of not only the magnitudes of the triplet and sing…
We present analytic calculations of minor hysteresis loops obtained when a sample is subjected to a time-varying field B(t)=${\mathit{B}}_{\mathrm{dc}}$+${\mathit{B}}_{\mathrm{ac}}$ cos\ensuremath{\omega}t. We enumerate eight classes of minor hysteresis loops, and calculations are done within the critical-state model…
Semicrystalline structures involving molecular packing and optimized chain conformations of three polyimides have been obtained with the charmm molecular-dynamics program, and their densities calculated. An eclipsed conformation of face-to-face stacking of polymer chains with a relative shift is observed, and the shif…
Experimental results of the effects of cold work on the corrosion of mild steel in a simulated, aqueous sour gas well environment are reported. The steel was cold rolled from 10% to 70% in increments of 10%. Detailed electrochemical kinetic analysis of the experimental data was conducted in an attempt to understand th…
SUMMARY Fast secondary electrons (FSE), which result from inelastic scattering of incident electrons, are known to generate a significant number of X‐rays for light elements, and also to degrade the spatial resolution of X‐ray microanalysis in thin foils. A Monte Carlo program simulating the generation and diffusion o…
An inorganic chemistry experiment has been developed combining two topics usually included in inorganic chemistry: heteropoly ions and mechanisms of oxidation-reduction reactions of transition metal ions.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControlled structure methacrylic copolymers as dispersants for ceramics processingH. S. Al-Lami, N. C. Billingham, and P. D. CalvertCite this: Chem. Mater. 1992, 4, 6, 1200–1207Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published i…
The deposition of hydrogenated amorphous silicon and diamond can be achieved using plasma‐enhanced chemical vapor deposition. In order to optimize the deposition process and thus the property profiles of the materials obtained it is important that the gas‐phase and surface reactions are understood. The modeling method…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDegradation of poly(vinyl chloride) with increased thermal stabilityMikael Rogestedt and Thomas HjertbergCite this: Macromolecules 1992, 25, 23, 6332–6340Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November 1992h…
Abstract An overview is given on auto‐photosensitive polyimides as introduced for the first time in 1985. It is shown how development proceeded and how the chemical basis of auto‐photosensitive polyimides was extended beyond BTDA. Novel “photosensitizer tetracarboxylic dianhydrides” like 2,3,6,7‐thioxanthonetetracarbo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifference ultraviolet spectroscopic studies on the binding of lanthanides to human serum transferrinWesley R. Harris and Yong ChenCite this: Inorg. Chem. 1992, 31, 24, 5001–5006Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published…
A model-based approach to the first-principles study of ferroelectric phase transitions is described. Formal relationships of the various possible models to the full crystal Hamiltonian and connections to phenomenological models in the literature are examined. Specific considerations for application to the perovskite…
Phosphorylation of glial fibrillary acidic protein (GFAP) induces disassembly of the filaments. An amino-terminal fragment of bovine GFAP (G-Hf) was produced by lysylendopeptidase digestion. G-Hf formed ribbon-like filaments in the presence of GFAP even in low ionic strength, whereas the fragment itself did not form a…
Crack tip shielding is evaluated for observed transformation zones in Ce‐TZP/Al 2 O 3 composites, in which the transformation zone sizes were changed significantly by varying the sintering temperature to control the transformation yield stress. The calculated shielding effects are consistent with an observed insensiti…
Potentiodynamic polarization curves were measured for Type AISI 304 and 316 stainless steels in solution at 4, 20, and 40°C. The pitting potentials decreased with increasing temperature. A positive effect on the inhibition of passivity breakdown was found in the presence of molybdenum. Surface enhanced Raman spectrosc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel mixed-valence selenium(IV)/selenium(VI) oxo compound: crystal structure determination and x-ray absorption near edge structure study of erbium selenite(IV) selenate(VI) hydrate, Er(SeO3)(SeO4)1/2.cntdot.H2ORussell E. Morris, Angus P. Wilkinson, and Anthony K. Cheetha…