Materials Literature
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Sizes and shapes of the component phases of immiscible polymer blends are strongly influenced by the viscoelastic properties of each component. For mixtures of different poly(ethylene terephthalate)s and polyamide-6 it can be established that the morphology under shear is the result of the viscosity ratio, which deter…
A convenient method for measuring the dc Kerr effect on the stage of a polarizing microscope is described. Two novel illustrations of this technique are presented: a low-field determination of the pretransitional Kerr effect in the isotropic phase of a nematic having a negative dielectric anisotropy and measurements o…
Abstract This paper presents new data on the resistance of recently developed high‐alloy stainless steels to localised corrosion in chloride solutions. Pitting potential was determined in artificial sea water, and critical pitting temperature CPT in very aggressive FeCl 3 solution. Critical crevice corrosion temperatu…
SUMMARY Dimensional changes of bovine kidney and liver tissues in the course of processing under four different schedules were measured. Shrinkage of tissues at dehydration, substitution with intermedium and paraffin infiltration stages was 1–2%, 2–5% and 5–10% respectively. There was no significant difference in fina…
Abstract The soils of Scotland are relatively young, being developed mainly on glacial drift deposited some 10 000 years ago. Only a small number of genetic soil types are represented, but this is more than compensated for by the wide variety of parent materials from which the drift ultimately derives. The major paren…
Abstract It is known that the x‐ray scattering pattern of an amorphous polymer may contain one or more halos corresponding to van der Waals spacings or larger. In this work we found that (i) the halo positions (and equivalent Bragg spacings) vary systematically with the cross‐sectional area of the polymer chain in the…
Abstract Compatible systems of total tree cubic volume, volume ratio, and stem taper curves are developed based on four well known volume equations: the constant form factor, the combined variable, Schumacher's, and Honer's. These systems are constructed to insure that the volume obtained for a portion of the tree bol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural characterization of a terbium(III) complex with 1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetraacetic acid. Lanthanide ions and the conformation of the 14-membered macrocyclesMarie Rose Spirlet, Jean Rebizant, Marie France Loncin, and Jean F. DesreuxCite this: In…
Abstract The crystalline morphology of injection‐molded polypropylene (PP), its relationship with crazing, and the effects of various impact modifiers on the morphology, crystallization, and fusion of PP have been studied. The highly oriented skin layer of an injection‐molded tensile bar after deformation was found to…
Natural (types Ia and IIa) and synthetic (type Ib) diamonds have been irradiated with energetic electrons and neutrons and then heated at temperatures up to 1400°C. Attendant changes in the infrared absorption spectra, especially above the Raman frequency (1332 cm−1), have been monitored. The most prominent absorption…
The two phosphates CsCoPO4 and CsZnPO4 are each shown to undergo two different phase transitions when heated above room temperature. The first one—form class 2 to presumably class 2 mm—is a ferroelastic to paraelastic transition, whereas the second one, occurring at a higher temperature—presumably from class 2 mm to c…
Abstract The synthesis of sulfonated poly(phenylene oxide) polymer was investigated. The poly(phenylene oxide) was synthesized through oxidative coupling from 2,6‐dimethyl‐phenol with copper (I) chloride‐pyridine catalyst and sulfonated using chlorosulfonic acid. The effects of catalyst concentration, solvent, and oth…
Sodium‐sulfate‐induced hot corrosion of preoxidized IN‐738 was studied at 975°C, with emphasis on processes occurring during the long induction period. Thermogravimetric tests were run for predetermined periods of time, after which one set of specimens was washed with water to give information about water‐soluble meta…
With the aim to develop a standard method for measurements of the polarization of ferroelectric chiral smectic C liquid crystalline materials, we have studied thin, well-aligned samples of MBRA-8 using the field-reversal method. The method also provides an estimate for the rotational viscosity and for the response tim…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTYields of glyoxal and methylglyoxal from the nitrogen oxide(NOx)-air photooxidations of toluene and m- and p-xyleneErnesto C. Tuazon, Roger. Atkinson, Helene. Mac Leod, Heinz W. Biermann, Arthur M. Winer, William P. L. Carter, and James N. PittsCite this: Environ. Sci. Techn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence and NMR studies of the conformational isomers of lanthanide complexes with an optically active polyaza polycarboxylic macrocycleHarry G. Brittain and Jean F. DesreuxCite this: Inorg. Chem. 1984, 23, 26, 4459–4466Publication Date (Print):December 1, 1984Publicati…
The influence of sulfate-reducing bacteria on the corrosion of mild steel and the effects of subsequent aeration were investigated using test vessels in which the base of the vessel was formed by steel foil test pieces. Corrosion rates were determined by weight loss measurements from foils and by electrical resistance…
The DNA sequence of the Escherichia coli metK gene has been determined. Protein sequence data for purified S-adenosylmethionine synthetase have also been obtained and confirm that metK is the structural gene for S-adenosylmethionine synthetase in E. coli. The sequence of the amino-terminal 35 residues of purified S-ad…
Abstract Melt polymerization conditions for D , L ‐lactide initiated with tetraphenyltin were studied with regard to polymer molecular weight and weight distributions. “Single” polymerization, “multiple” polymerization (four or eight reactions at the same time), and time‐dependent studies are described. Single polymer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe .pi.-.pi. interactions and bandwidths in molecular metals. A chemical, structural, photoelectron spectroscopic, and Hartree-Fock-Slater study of monomeric and cofacially joined dimeric silicon phthalocyaninesE. Ciliberto, K. A. Doris, W. J. Pietro, G. M. Reisner, D. E. E…