Materials Literature
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Abstract The influence of chemical groups regularly spaced along a polymer chain on structure and behaviour of chain folded single crystals was studied on linear aliphatic polyesters with different lengths of repeating unit. Poly(oxytetramethyleneoxysebacoyl) (or polyester 4,10), poly(oxyhexamethyleneoxysebacoyl) (or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Dynamics of Block-Copolymer Molecules in Solution. The Free-Draining LimitF. W. Wang and E. A. DiMarzioCite this: Macromolecules 1975, 8, 3, 356–360Publication Date (Print):May 1, 1975Publication History Published online1 May 2002Published inissue 1 May 1975https://pubs.…
This study reports on measurements with multiple techniques delineating the complete sequence of events from the corona streamer to the arc phase in the spark transition for large rod-to-plane air gaps applied by positive switching impulses. Observations with a image converter camera, photomultipliers, a Boys camera,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeparation of organic sulfides from aromatic concentrates by ligand exchange chromatographyJames W. Vogh and James E. DooleyCite this: Anal. Chem. 1975, 47, 6, 816–821Publication Date (Print):May 1, 1975Publication History Published online1 May 2002Published inissue 1 May 19…
Abstract An adiabatic heat capacity study of poly(diethylsiloxane) confirms that it has a single glass transition occurring at 130°K, the lowest glass transition reported to date for a high molecular weight polymer. The two previously reported glass transitions are first‐order thermodynamic peaks whose location is dep…
Abstract Total thermal analysis provides a reasonably accurate method for the identification of the polymers in tire treads or black sidewalls. DSC curves in nitrogen distinguish SBR, BR, or blends from NR or IR. T g then distinguishes between these polymers, although confusion may arise in the case of blends of SBR/B…
Efficiencies of Yb 3+ ‐Er 3+ activated up‐conversion phosphors are determined by the efficiency of the excitation process and by that of the final emission process in the Er 3+ ion. The former process is dependent on the infrared excitation density. We measured the efficiency of the emission process by excitation to s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and spectral properties of metal carbonyl derivatives of the tetrabasic, nonchelating phosphatriazaadamantane ligandM. York. Darensbourg and D. DaigleCite this: Inorg. Chem. 1975, 14, 5, 1217–1218Publication Date (Print):May 1, 1975Publication History Published onl…
Abstract A ground rice hull ash prepared by a new burning process has been found to be a moderately reinforcing filler for rubber. This filler, 85-90% amorphous silica and 10-15% carbon, is made by a controlled incineration process in which the bulk of the organic components of the rice hulls is removed, leaving the s…
The oxidation kinetics of a single crystal of SrTiO 3 were measured with a tensivolumetric system over the temperature range 700°–975° at 0.03 atm oxygen pressure. The oxidation was found to be oxygen diffusion limited with an activation energy of 14.9 ± 1.3 kcal / mole . Combining the kinetic data with relative defec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInductively coupled plasma-optical emission spectrometry. Application to the determination of alloying and impurity elements in low and high alloy steelsConstance C. Butler, Richard N. Kniseley, and Velmer A. FasselCite this: Anal. Chem. 1975, 47, 6, 825–829Publication Date…
1. A specimen of stereospecifically 2-tritiated 3-hydroxybutyric acid was prepared by hydroboration of ethyl crotonate. It was assumed that the hydroboration reaction took a syn course and hence that (2R,3S) plus (2S,3R)-3-hydroxy[2 minus 3H1]butyric acid was formed after oxidation and hydrolysis. 2. 3RS-3-Hydroxy[2 m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTManganese(II) porphyrins. Synthesis, structures, and preference for five-coordinationBarbara Gonzalez, Jay Kouba, Sharon Yee, Christopher A. Reed, John F. Kirner, and W. Robert ScheidtCite this: J. Am. Chem. Soc. 1975, 97, 11, 3247–3249Publication Date (Print):May 1, 1975Pub…
Abstract Two component interpenetrating polymer networks (IPN) of the SIN type (simultaneous interpenetrating networks), composed of a polystyrene network (crosslinked with divinyl benzene) and a polyester‐polyurethane network (crosslinked with trimethylolpropane), were made. Electron microscopy and glass‐transition m…
The emission angular distribution, total energy distribution, noise spectrum, and emitter life have been measured for the W/Zr thermal-field cathode. The results give an emitter life in excess of 1000 h at T=1350 to 1450 K, P?2×10−8 Torr, and a total current of ∼100 μA. A low-noise highly confined beam long the (100)…
The simple infinite-aperture charge-density approximation to lattice imaging is extended to include the effects of finite aperture and objective-lens spherical aberration. Images computed using these approximations are compared with images computed by the accurate N-beam technique and with experiment in order to estab…
A new technique for measuring the spectral distribution of photoionization cross sections in photoconductors is presented. The method makes use of the fact that the occupancy of an impurity level is not changed during illumination with photons of different energy if the photocurrent is kept constant. A constant photoc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of silica supported chromium ions. I. Characterization of the samplesA. Zecchina, E. Garrone, G. Ghiotti, C. Morterra, and E. BorelloCite this: J. Phys. Chem. 1975, 79, 10, 966–972Publication Date (Print):May 1, 1975Publication History Published online1 May 2002Pub…
Several aqueous dispersions of charged polystyrene spheres (mean radius =250 aa) have been studied at very low ionic strength by conventional light scattering and photon correlation spectroscopy. Plotted as a function of scattering angle, the mean scattered intensity exhibited maxima similar to those found in the stru…
Abstract Cobalt(II and III) complexes including Vitamin B12 have been investigated by X-ray photoelectron spectroscopy. Cobalt(II) and cobalt (III) complexes show the 2p1⁄2–2p3⁄2 peak separation of 16.0±0.3 eV and 15.1±0.3 eV, respectively. The data of the binding energies for Co 2p1⁄2, Co 2p3⁄2, N ls and S 2p in coba…