Materials Literature
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Novel thermotropic, metallomesogenic polymers with a poly(ferrocenylsilane) main chain and 4-pentoxy-4′-hydroxyhexanoxyazobenzene or 4-pentoxy-4′-hydroxy-undecyloxyazobenzene acrylate side chains have been prepared; each material displays a nematic mesophase.
Abstract The mechanical properties and gas/water permeabilities of extrudates of low density polyethylene (LDPE), wheat starch and ethylene acrylic acid (EAA) or polycaprolactone (PCL) were studied after their conditioning at various relative humidities. Satisfactory agreement was found between the experimental values…
The results of a structural analysis by x-ray diffraction on fiber samples of the nematic mesophase with cybotactic groups of poly(urethane-ester) TDI-${\mathrm{C}}_{2}$ ${\mathrm{C}}_{6}$ , TDI-${\mathrm{C}}_{6}$ ${\mathrm{C}}_{4}$ , TDI-${\mathrm{C}}_{6}$ ${\mathrm{C}}_{6}$ , TDI-${\mathrm{C}}_{6}$ ${\mathrm{C}}_{8}…
Ab initio calculations, including the electron correlation effects via the Møller–Plesset partitioning, of the static longitudinal polarizability (αL), first and second hyperpolarizabilities (βL and γL) of small push-pull molecules have been carried out with the 6-31G and 6-31G* basis sets. Two types of conjugated seg…
Heteroatomic cages (BN/2NN/2) with borons and nitrogens fully replacing alternant sets of carbons in cages are built graph-theoretically and investigated via the semiempirical MNDO Hamiltonian. The comparison with their parent carbon cages CN is made in terms both of electronic and of geometric changes. Infinite class…
The total rate constant for the NH 2 + NO reaction has been measured in the temperature range 305−1037 K using a laser photolysis mass spectrometric technique by probing the rates of H 2 O formation and NO decay. A weighted least-squares analysis of our data gives the following total rate constant expression: k t = 8.…
Samples Lan+1NinO3n+1–δ(n=2,3) have been prepared by two different methods, which lead to different oxygen stoichiometry values. Materials obtained by the citrate route always show higher content of Ni3+ , which can be rationalized by the high reactivity and the original morphology of the precursors obtained by this m…
In Volume 1 Preface Introduction Description of Pharmacological Classifications, I.K.M. Morton A to M In Volume 2 N to Z In Volume 3 Name Index Molecular Formula Index Chemical Abstracts Service Registry Number Index Type of Compound Index
A variable-temperature and -pressure, multiple-field 17 O NMR study has been performed on the gadolinium(III) complexes of an ethoxybenzyl (L 1 ) and symmetric (L 2 ) and asymmetric (L 3 ) mono(methylamide) derivatives of (carboxymethyl)iminobis(ethylenenitrilo)tetraacetate (dtpa) in order to study water exchange and…
The investigation identifies the two main types of pollen sedimentation in the Rhône delta, and presents synthetic pollen spectra in terms of ecological groups in order to predict the pollen source areas. Two different domains are studied: the lagoonal zone occupied by the Vaccarès where atmospheric pollen imput predo…
This paper presents experimental and theoretical results to explain the phenomenon of sudden flashover on artificially contaminated nonceramic insulators. A sudden flashover in this paper is defined as a flashover occurring on a partially contaminated insulator, and which is preceded by little or no surface discharge…
Recently there has been substantial interest in the formation of transient Fe-Al interfacial layers during hot-dip galvanizing and galvannealing. These layers delay the formation of Fe-Zn intermetallic compounds by preventing the interdiffusion of Zn and Fe. Despite the industrial importance of this inhibition phenome…
In situ silica reinforcement of styrene–butadiene rubber (SBR) has been achieved by a sol–gel process using tetraethoxysilane (TEOS). SBR was sulfur-cured and the sol–gel reaction of TEOS was carried out in TEOS or in a TEOS–tetrahydrofuran (THF) mixture. The in situ silica was filled homogeneously in the rubber matri…
Raman spectra of the following binary molten salt systems have been measured: (a) YBr 3 –ABr (A = Li, K, Cs) at temperatures up to 920 °C and at different compositions; (b) YF 3 –KF at temperatures up to 1000 °C and compositions up to 50% YF 3 . The spectral changes occurring upon melting of Cs 2 NaYBr 6 , YBr 3 and K…
Design of cast blasting rounds and optimization of the blasting process has taken on a new and much greater importance with the emergence of overburden casting operations involving thousands of tons of explosives in each blast. This paper addresses the fundamentals of blast design and optimization for explosive fragme…
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Abstract Some properties of the tensor algebra on manifolds are discussed with respect to the classical tensor algebra of continuum mechanics. Basic definitions and relations of linear maps are briefly recalled and applied to tensor spaces, where special attention is focused to the definition of dual and transposed ma…
Recent studies have proposed that a near-interface conformation of PMMA in PMMA/metal substrate systems is different from the bulk polymer. High-resolution XPS analysis using monochromated X-ray sources has shown that PMMA interactions with metal oxide substrates are determined by the acido-basic nature of the substra…
Some solid-state pharmaceutical properties and the solid-state thermal stability of the model dipeptides aspartame (APM) and aspartylphenylalanine (AP), have been investigated. Studies by differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), high-performance liquid chromatography, powder X-ray d…
The effect of applied hydrostatic pressure (up to 275 MPa) on the photophysical properties of the cuprous iodide cluster Cu 4 I 4 py 4 ( I ) in room temperature solutions has been examined. Although there was little pressure effect on emission spectra or lifetimes under conditions where the solutions remained fluid, d…