Materials Literature
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The traditional approach used in modeling of composites reinforced by three-dimensional (3-D) braids is to assume a simple unit cell geometry of a 3-D braided structure with known fiber volume fraction and orientation. In this article, we first ex amine 3-D braiding methods in the light of braid structures, followed b…
Abstract This review presents a general picture of suspension, dispersion, and interfacial polycondensation processes employed for the preparation of beaded resins, dry powders, and high solid dispersions. The polymer systems covered include polyamides, polyesters, polycarbonates, polyurethanes, and phenol‐formaldehyd…
In high nitrogen stainless steels and nitrogen surface-doped Mo-containing alloys, nitrogen has been shown to enhance passivity. The mechanism of this apparent Mo–N synergism appeared to be twofold. First, the formation of stable surface nitrides affects a reduction in active dissolution, and, second, reactions betwee…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnexpected selectivity in the alkylation of polyazamacrocyclesWilliam J. Kruper Jr., Philip R. Rudolf, and Charles A. LanghoffCite this: J. Org. Chem. 1993, 58, 15, 3869–3876Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue…
The electrical properties of the ZnO varistors are demonstrated in this present study to be affected by the sintering temperature. The variation of the non-ohmic behavior with sintering temperature is indicated from I-V and C-V measurements to be a result of the changes of the interface defect density at the grain bou…
Perturbed-angular-correlation (PAC) spectroscopy was used to measure combined nuclear-magnetic-dipole and nuclear-electric-quadrupole interactions in rare-earth orthoferrite (REO) ceramics, R${\mathrm{FeO}}_{3}$ (R=La,Pr,Nd,...,Lu). The rare-earth orthoferrites are canted antiferromagnets that have orthorhombically di…
Abstract The morphology of the dispersed phase in immiscible polymer blends plays an important role in the determination of the final physical properties. This paper considers factors that influence the final state of deformation of the dispersed phase, and in particular, the formation of fibers and lamellae. Blends o…
A survey of the use of cyclo- and poly(phosphazenes) in fire resis tant applications is presented. Where appropriate, synthesis and commercial availability will be indicated. Two fundamentally different approaches, phosphazenes as additives or as intrinsically flame resistant materials, will be discussed. While the fo…
We present a theoretical approach for calculating the fields diffracted by gratings made of highlyconducting wires that have a rectangular shape. The fields between the wires are represented in terms of modal expansions that satisfy the approximated impedance boundary condition. Our results show thatthis procedure is…
The light protein components of silk fibroin were analyzed by Western blotting using polyclonal antibodies against two synthetic peptides that are segment of the light (L-) chain [Yamaguchi et al. (1989) J. Mol. Biol. 210, 127-139] and P25 [Chevillard et al. (1986) Sericologia 26, 435-449], respectively, and against t…
Although descriptions of the effect of stress on spontaneous magnetization within a single domain already exist, there remains no adequate mathematical model for the effects of noncoaxial magnetic field and stress on bulk magnetization in a multidomained specimen. This article addresses the problem and provides a phen…
Abstract Bifunctional telechelics with defined structure can be prepared by oligomerization of oxiranes, β‐butyrolactone and L‐lactide using aluminium Schiff's base complexes as initiators. Chiral initiator (SALCENAlCl) shows a stereoelective character leading to preferential oligomerization of one enantiomer from a r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMesomorphic form of syndiotactic polystyrene as composed of small imperfect crystals of the hexagonal (.alpha.) crystalline formFinizia Auriemma, Vittorio Petraccone, Francesco Dal Poggetto, Claudio De Rosa, Gaetano Guerra, Carla Manfredi, and Paolo CorradiniCite this: Macro…
The role of different inorganic cations of several elements and organic materials in combination with different concentrations of propargyl alcohol (PA) was investigated in an effort to control the dissolution of mild steel in boiling (102 ± 1°C) hydrochloric acid (HCl) solution. Inorganic cations of chromium (Cr6+),…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetrahedral gold cluster [Au4]2+: crystal structure of {[(tert-Bu)3PAu]4}2+(BF4-)2.2CHCl3Edgar Zeller, Holger Beruda, and Hubert SchmidbaurCite this: Inorg. Chem. 1993, 32, 15, 3203–3204Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of backbone flexibility on the transitional properties of side-chain liquid-crystalline polymersC. T. Imrie, F. E. Karasz, and G. S. AttardCite this: Macromolecules 1993, 26, 15, 3803–3810Publication Date (Print):July 1, 1993Publication History Published online1 May 2…
Crystallographers use x-ray spectra to understand the structure of solids and ergodic theorists use spectra of abstract dynamical systems for structural studies; the relation of the two is shown here.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic, photophysical, and redox properties of some meso-substituted free-base porphyrinsHarold N. Fonda, Julanna V. Gilbert, Russell A. Cormier, Julian R. Sprague, Keiko Kamioka, and John S. ConnollyCite this: J. Phys. Chem. 1993, 97, 27, 7024–7033Publication Date (P…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation M. Bousmina, R. Muller; Linear viscoelasticity in the melt of impact PMMA. Influence of concentra…
Ga2O3 is a purely n-conducting metal oxide at high temperatures. Increasing interest is being shown in this material as the basic material for gas sensors since its electrical conductivity is gas dependent. To investigate its electrical conductivity mechanism in the temperature range between 800 and 1000 °C, conductiv…