Materials Literature
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The crystal and molecular structures of the β-polymorphic forms of phthalocyaninatomanganese(II), [Mn(pc)], and phthalocyaninatocobalt(II), [Co(pc)], have been determined by single-crystal X-ray diffraction methods at 295 K, and also at 116 K in the case of [Mn(pc)]. Crystals are of the monoclinic β-polymorph type, sp…
Rates of relaxation of polymer chains of high molecular weight preclude extensive configurational rearrangements of long range in the process of crystallization from a melt. Analyses of neutron scattering functions for deuterated polyethylene and polypropylene chains dispersed with the corresponding protonated host in…
The principles of forming metastable solids by rapid melt quenching are reviewed with primary emphasis on the growth of crystals into melts and glasses. Experience is reviewed which indicates that the rate of growth of crystals in pure metal melts may be limited only by the impingement frequency of atoms from the melt…
Examines the evolution of this new scientific discipline. Deals with selected solid (engineering) materials while also describing asbestos, asphalt, natural gas, cellulose, wood, reeds, lignin, paper, liquid crystals, spinels, coal tar, and coal gas and petroleum. Considers such recent materials as glassy metals, sial…
A promising alternative for hydrogen storage is storage as a metal hydride. The properties and applications of those systems which have proven or potential utility as hydrogen storage compounds are summarized. Specific systems discussed are magnesium alloy hydrides, iron-titanium alloys, titanium-chromium alloys, and…
It is shown that the “reptation” process proposed by de Gennes allows molecules to be reeled from the melt onto the crystal surface with chain folding by the force associated with crystallization at a rate that is comparable with that demanded by the observed crystallization kinetics for polyethylene fractions n= numb…
In the course of experiments using the Freedericksz transition on a planar nematic film in a magnetic field perpendicular to the limiting plates, we have observed the transient existence of a periodic roll structure very similar to published observations by Carr, and apparently similar to Williams domains. The present…
Neutron scattering experiments have been performed with n-alkane and polyethylene (PE) samples crystallized from melt and solution. Differences between different conformation models are most pronounced in the short-range order region covered by intermediate angle neutron scattering (IANS) experiments. The angular rang…
Alterations of the concentrations of certain components in a lyotropic nematic mesophase may change the sign of the anisotropy of its magnetic susceptibility, Δχ. We report here : 1) the determination of the sign of Δχ by optical observation of the textures in the presence of a magnetic field, 2) the results of an X-r…
Description This volume covers six subject areas: microstructure, fracture of thermal reactor materials, primary damage production and irradiation creep simulation, dosimetry and damage function analysis, mechanical properties and creep.
Abstract Melt blends of polycarbonate and poly(ethylene terephthalate) were prepared and examined for their transitional behavior by thermal analysis and dynamic mechanical testing. A single T g was observed for compositions containing more than 60%–70% PET by weight while compositions below this range showed two glas…
The effect of pretreatment temperature on the u.v. photo-adsorption of O2 on TiO2 has been studied by e.p.r. Different oxygen species are found if the sample is completely hydroxylated or strongly dehydroxylated, this being related to two different photo-adsorption mechanisms. O2H· and V-centres are found for the hydr…
Abstract The characterization of the gel‐water interface is considered, particularly with respect to obtaining the interfacial free energy between the gel and water, γ utilizing contact angle data. The question of contact‐angle‐induced deformation of the three‐phase region is examined and visual documentation of such…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state spectroelectrochemistry of crosslinked donor bound polymer filmsFrank B. Kaufman and Edward M. EnglerCite this: J. Am. Chem. Soc. 1979, 101, 3, 547–549Publication Date (Print):January 1, 1979Publication History Published online1 May 2002Published inissue 1 Januar…
We have obtained X-ray diffraction patterns from the mesomorphic phase of two derivatives of terphenylene. The observations agree with the structure already proposed for the mesomorphic phase of a similar molecule : the molecules are stacked in columns and the columns form a regular hexagonal array. In addition it is…
The mechanical properties of polymers are strongly influenced not only by the structure of the material but by the magnitude of the molecular orientation. Thus a great deal of interest exists in information about the molecular orientation in samples introduced by drawing or other forming processes. Several techniques…
Abstract Based on experimental data, changes of properties of plasticized PVC containing stearates of Ca, Zn, Cd, and Pb stabilizers during thermal degradation are discussed. The mechanism of action of these stabilizers is described in kinetic form.
K2SnBr 6 at room temperature, monoclinic, P2~/n, a = 10.621 (2), b = 7.427 (2), c = 7.442 (2) fi~, fl = 90.18 (2) °, D x = 3.825 Mg m -3 for Z = 2. The crystal structure is a distorted KEPtCI 6 structure. The
Published information on the performance of 90/10 copper-nickel-iron alloy in sea water environments is reviewed, covering the effect of iron content and of different heat treatments, behaviour in quiescent sea water and in polluted sea water, resistance to impingement attack (effect of water velocity), crevice corros…
Photoemission spectroscopy (u.p.s. and X.p.s.) and Auger Spectroscopy (X-ray induced) have been used to study the oxidation of clean evaporated zinc films. At 300 K, two oxygen species coexist throughout the adsorption process. The major species [O(1s) b.e. 530.0 eV] is characteristic of oxide and is considered repres…