Materials Literature
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A series of new mono- and bi-nuclear rhenium(I) complexes, [Re(CO)3(N–N)L]ClO4 and [{Re(CO)3(N–N)}2L′][ClO4]2[where N–N = 2,2′-bipyridine (bpy) or 1,10-phenanthroline (phen) and L = 4-phenylazopyridine (phazo), 4-styrylpyridine (stypy), 4-pyridyl-2-ethylbenzene (NB); L′= 4,4′-azopyridine (azo), 1,4-bis(4-pyridyl-2-eth…
Partial discharges (PD) and the way they affect insulation quality has for decades been a rewarding subject for many researchers. There are two topics that are of particular interest to the workers in the field of PD. One is the impact of a wide variety of statistical tools on the interpretation of discharge data obta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFilm Thickness Dependent Thermal Expansion in Ultrathin Poly(methyl methacrylate) Films on SiliconWen-li Wu, John H. van Zanten, and William J. OrtsCite this: Macromolecules 1995, 28, 3, 771–774Publication Date (Print):January 1, 1995Publication History Published online1 May…
Normal corn starch was extruded with polystyrene or polymethyl methacrylate and blowing and cross-linking agents in a single screw C. W. Brabender laboratory scale extruder at 140 C barrel temperature, 140 rpm screw speed and 16% moisture content. Expansion ratio, unit density, water solubility index, spring index, co…
This work studies the fire degradation of an intumescent for mulation Polypropylene (PP)-Ammonium Polyphosphate (APP)/Pentaerythri tol (PER) using the cone calorimeter. An intumescence model is described which introduces the notion of degradation front. From the weight loss data recorded by the cone calorimeter and th…
We have studied the crystallization, crystal structure, structure morphology, and magnetic properties of R/sub 6/Fe/sub 87/Nb/sub 1/B/sub 6/ with R=Nd, Pr, Dy, Tb and Nd/sub 3.5/Fe/sub 91/Nb/sub 2/B/sub 3.5/ melt-spun ribbons with a microstructure consisting of a mixture of exchange-coupled magnetically hard (R/sub 2/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnzymic Grafting of Amylose from Poly(dimethylsiloxanes)Volker v. Braunmuehl, Gerd Jonas, and Reimund StadlerCite this: Macromolecules 1995, 28, 1, 17–24Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 1995http…
The concentration range over which a self-assembted macrocyclic structure is stable is given by the critical self-assembly concentration (lower limit) and the effective molarity for cyclisation (upper limit); the relationships between these parameters, the size of the assembly and the properties of the component inter…
To assign infrared (IR) absorption bands related to Si‐H vibrations in porous silicon, harmonic frequencies for model clusters were calculated by an ab initio molecular orbital (MO) method using a 6–31 G * basic set. Vibrations associated with a group of interest can be obtained by terminating the cluster with pseudoa…
Four homologous mesogens of the hexakis(n-alkoxy)triphenylene series (HATn, n= 4,6,9,11), have been doped with the one electron oxidant NOBF4, and the electrical conductivity measured as a function of frequency in the hexagonal columnar Dh phase. The limiting low-frequency conductivities both parallel, σ‖, and perpend…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlternating Ferro- and Antiferromagnetic Interactions in Unusual Copper(II) ChainsGiovanni De Munno, Miguel Julve, Francesc Lloret, Juan Faus, Michel Verdaguer, and Andrea CaneschiCite this: Inorg. Chem. 1995, 34, 1, 157–165Publication Date (Print):January 1, 1995Publication…
The conductivity of a polymer is determined by the availability of charge carriers and their mobility, and both terms are dominated by the trapping states in the polymer. The distribution in energy of these states may be studied by populating the states and observing the current that results from the relaxation of the…
Time-of-flight secondary ion mass spectrometry (TOF SIMS) and X-ray photoelectron spectroscopy (XPS) have been jointly used to study a two-step surface processing of AS4 carbon fiber: extraction of sizing in CH2Cl2 and functionalization with trimellitic anhydride. The combined information on molecular specificity obta…
The following theoretical equation has been obtained for measuring the rate of slow crack growth in polyethylene in terms of the crack opening displacement rate δ: δ̇=αy(1−y2)2ηdoE2α2cK4 Here δy is the yield point, K is the stress intensity, η is the intrinsic viscosity of the fibrils in the craze, E is Young's modulu…
The efficacy of various solid acid catalysts and exchanged clays in a single-pot synthesis of methyl tert-butyl ether (MTBE) from tert-butyl alcohol and methanol is investigated; dodecatungstophosphoric acid (HPA) supported on K-10 clay gives the best yield with highest selectivity for MTBE.
In reactions between the hexamolybdate [Mo6O19]2– and 1,4-diaminobenzene, terminal oxides are replaced by 4-aminophenylimido ligands and the first structurally characterised polyoxometallate to contain functionalised organoimido ligands, (Bun4)2[Mo6O17(NC6H4NH2)2]5, is also the first example of a trans-bis(imido) deri…
The main lines of a Continuum Damage Mechanics Modelling are reviewed, for applications to brittle materials treated as elastic damageable ones. The proposed damage models consider in the same framework the cases of initially isotropic materials like concrete and anisotropic composites. Attention is focused on the dam…
A series of sodium polyphosphate glasses of composition ${\mathrm{Na}}_{\mathit{n}+2}$${\mathrm{P}}_{\mathit{n}}$${\mathrm{O}}_{3\mathit{n}+1}$ have been studied using synchrotron-radiation x-ray-absorption spectroscopy. High-resolution P L-edge and K-edge x-ray appearance near-edge structure (XANES) as well as K-edge…
The time function of the Erying reaction rate theory of insulation life is modified to demonstrate a physical origin for temperature threshold. Various mechanisms by which trapped charges may be involved in degrading the polymer are examined, and incorporated into the life model through an alteration to the free energ…
Flashover mechanisms of silicone rubber used for outdoor insulation is presented and experimentally proven. A hydrophobic surface of silicone rubber wets and accumulates contaminants differently compared to conventional porcelain and glass insulators. This suggests that the flashover mechanism of silicone rubber insul…