Materials Literature
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Abstract Fourier‐transform infrared spectroscopy has been used for the detection of conformational changes induced by plasticization in atactic poly(vinyl chloride) (PVC). The amount of short trans syndiotactic sequences decrease upon plasticization. This change depends on the amount and kind of plasticizer. Differenc…
PTCR characteristics in porous semiconducting barium titanate ceramics with Curie points from 60° to 360°C were investigated. The magnitude of the PTCR effect in these cerumics decreases self‐onsistently with increasing Curie point within this temperature range. A PTCR efSect of more than 4 orders of magnitude was ahs…
Abstract Physical Blends of ultrahigh‐molecular‐weight linear polyethylene (UHMW LPE) and normal‐molecular‐weight linear polyethylene (NMW LPE) have been evaluated in terms of melt flow rate, tensile stress‐strain behavior, heat of fusion, melting temperature, and crystallinity. The behavior of the blends is intermedi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRing size effects on the structure of macrocyclic ligand complexes: copper(II) complexes with 12-16-membered cyclic tetrathia ethersVirginia B. Pett, Leonard L. Diaddario Jr., Edward R. Dockal, Peter W. Corfield, Christopher Ceccarelli, Milton D. Glick, L. A. Ochrymowycz, an…
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Tensile properties of native cotton cellulose having various water contents from 0% to 50% in weight were measured. X-ray diffraction patterns of samples containing sorbed water were also measured. The dimensional change of the cross section of a single fiber was observed under a microscope. The amount of bound water…
Article The structural properties of synthetic Sr-åkermanite, Sr2MgSi2O7 was published on November 1, 1983 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 163, issue 1-4).
This paper surveys the temperature, microstructural and environmental variations of the fracture properties of ferroelectric ceramics. Earlier work shows that fracture toughness decreases on heating through the Curie temperature. There is also anomalous behavior in the strength at small crack sizes, indicative of a gr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA carbon-bonded tris(2,2'-bipyridine)iridium(III) complex: (2,2'-bipyridinyl-C3,N')bis(2,2'-bipyridine-N,N')iridium(III) perchlorate-water (3/1)G. Nord, A. C. Hazell, R. G. Hazell, and O. FarverCite this: Inorg. Chem. 1983, 22, 23, 3429–3434Publication Date (Print):November…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman scattering by molecules adsorbed on aqueous copper colloidsJ. A. Creighton, M. S. Alvarez, D. A. Weitz, S. Garoff, and M. W. KimCite this: J. Phys. Chem. 1983, 87, 24, 4793–4799Publication Date (Print):November 1, 1983Publication History Published onli…
Some of device applications of the Pb(Mg1/3Nb2/3)O3-based electrostrictors are reviewed, including displacement transducers for controlling optical pathlength (sensitive AC interferometer, bistable optical device and deformable mirror), and mechanical position actuators (micro-angle adjusting device and servovalve fla…
Abstract Although most triglyceride oils contain only double bond functionality, a few oils such as castor oil, vernonia oil, lesquerella oil, etc., contain other functional groups. These functional groups include hydroxy and epoxy groups, permitting the easy formation of polyesters and/or polyurethanes. In addition t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox chemistry of metalloporphyrins in aqueous solutionA. Harriman, M. C. Richoux, and P. NetaCite this: J. Phys. Chem. 1983, 87, 24, 4957–4965Publication Date (Print):November 1, 1983Publication History Published online1 May 2002Published inissue 1 November 1983https://doi…
The reaction sequence in the formation of Pb(Zr 0.6 Ti 0.4 )O 3 (PZT 60/40) was investigated as a function of PbO and ZrO 2 raw material variations, using powder X‐ray diffraction. Particular emphasis was placed on the final stages of reaction in the formation of PZT solid solution. Based on the present work, a more d…
The elastic strain associated with the field-induced transition from an antiferroelectric phase to a ferroelectric one has been measured at several temperatures in a PZT-family ceramic Pb0·99Nb0·02 [(Zr0·6Sn0·4)0·94Ti0·06]0·98 O3. Reproducible large strain change of about Δℓ/ℓ∼ due to the forced transition may be prom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular photochemical electron transfer. 2. Fluorescence studies of linked porphyrin-quinone compoundsAleksander Siemiarczuk, Alan R. McIntosh, Te Fu Ho, Martin J. Stillman, Kenneth J. Roach, Alan C. Weedon, James R. Bolton, and John S. ConnollyCite this: J. Am. Chem.…
The plasma etching of the type H Kapton polyimide film has been studied in a parallel plate reactor with two different gas mixtures; and . High etching rate (0.5–3 μm/min) has been obtained in both cases. At a pressure of 0.2 Torr an anomalous loading effect is observed which is attributed to the nitrogen released by…
A modified indentation technique for measuring toughness is described. The method retains the elastic/plastic basis of previous contact fracture descriptions but eliminates explicit reference to residual stress parameters in the toughness formulation. Accordingly, improved correlations between indentation data and “co…
A short review is presented of the theoretical background of a physical model for the quantification of Auger electron spectroscopy (AES) for surface analysis. The recent studies on the data-base for the inelastic mean free paths (IMFP) by Seah and Dench and systematic calculations of the backscattering factors ( R )…
Sodium azide undergoes a transition from a high-temperature rhombohedral phase to a low-temperature monoclinic phase at 292.2 K. Results of x-ray diffraction studies of the low-temperature phase are reported which indicate that the transition is of the elastic type with the order parameter corresponding to a linear co…