Materials Literature
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A series of poly(ethylene terephthalate) fibers of various molecular weights was first drawn to a practical maximum draw ratio and then allowed to contract thermally under tension for 10, 20, and 38%. These contracted fibers exhibit a high degree of plasticity even when tested at—100°C and extension rates of 1300%/sec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDomain-Boundary Structure of Styrene-Isoprene Block Copolymer Films Cast from Toluene SolutionsTakeji Hashimoto, Kikuo Nagatoshi, Akira Todo, Hirokazu Hasegawa, and Hiromichi KawaiCite this: Macromolecules 1974, 7, 3, 364–373Publication Date (Print):May 1, 1974Publication Hi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic studies for tetraphenylporphyrincobalt(II) complexes of carbon monoxide, nitrogen oxide, molecular oxygen, methylisonitrile, and trimethyl phosphite, and a bonding model for complexes of carbon monoxide, nitrogen oxide, and molecular oxygen with cobalt(II) and…
PVT meas ure me nts we re mad e o n liquid and glassy poly(vinyl ace tate) ove r ra nges of -30 to 100 C and 0 to 800 ba r (gage press ure). Th e data we re ob tained by three diffe rent th e rmodynami c hi stories: (a) variable formation press ure. (b) co nsta nt formati on press ure at one a tm os ph e re, a nd (c)…
Human dermis was digested with pepsin under conditions that maintain the helical conformation of the bulk of the collagen.Molecules containing (rl(II1) chains were separated from [al(I)]& collagen by differential salt precipitation at pH '7.5, with the use of the peptides produced by CNBr cleavage to monitor the compo…
A new mechanism is proposed for the formation and the migration of planar defects in ABO3+x, perovskite-type compounds.
In an attempt to provide objective measures of the changes induced in chert by heat treatment, ten pairs of preforms were made, and one of each pair was heat treated, using a probable aboriginal technique. Paired bifaces were then chipped from the preforms. Differences in the flaking qualities of the heated and the un…
SUMMARY Techniques used by the authors for preparing wood samples for the scanning electron microscope are detailed. Topics covered include: procedures for cutting, cleaning, dehydrating, mounting and storage of the specimens.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure, crystal forces, and charge distribution in salts of the tetrachlorozincate anionJohn A. McGinnetyCite this: Inorg. Chem. 1974, 13, 5, 1057–1061Publication Date (Print):May 1, 1974Publication History Published online1 May 2002Published inissue 1 May 1974htt…
The interaction of graphite grains with a hot gas is investigated. Detailed computations, based on experimental data and simple theoretical models, are presented of the energy transfer by gas particle collisions and of the sputtering rates and grain lifetimes, as functions of gas temperature and grain radius. The elec…
Deformation twinning in f.o.c. crystals has been investigated by vising silver-and copper-alloy crystals, which were deformed in tension at temperatures down to 4·2°K. Problems mainly concerned are (1) the nucleation process with particular relation to cross-slip and (2) the suppression of the growth of twins in high-…
The general theory of the third-order electronic susceptibility has been specialized to some model systems in order to evaluate the associated nonlinear refractive index of solid materials. The results indicate oppositely signed terms of comparable magnitude, and it is found that the dominant positive contribution inv…
Abstract The most highly reinforcing fillers, namely carbon blacks and silicas, consist of aggregates of quasi-spherical particles fused together. In the absence of direct experimental studies with single-particle carbon blacks or silicas of high surface area, we cannot be sure if aggregated structure is essential for…
Mild plasma cleaning of metal surfaces was shown to be effective in removing organic contaminants. Auger electron spectroscopy and surface wettability measurements were used to evaluate the plasma cleaning procedure and to provide a comparison with conventional solvent cleaning methods.
The phase diagram of the Mn–Bi system near the compound MnBi was studied with single crystals in the as-grown and heat-treated states. The results show that the high-temperature phase of MnBi is in fact a separate compound with chemical formula Mn1.08Bi, when grown from a Bi-rich solution. It was found that the transf…
Dynamic compressive stress-strain data of several polymer foams obtained from uniaxial compressive tests over a wide range of loading rates are presented. For the tests with lower loading rates, an electro- hydraulically operated tester was used, while the higher rate test data were obtained by a gravity-operated drop…
The M\"ossbauer spectra produced by ${10}^{\ensuremath{-}4}$-at.% ${\mathrm{Co}}^{57}$ and 0.5-at.% ${\mathrm{Fe}}^{57}$ doped in the normal spinels ${\mathrm{Co}}_{3}$${\mathrm{O}}_{4}$, Co${\mathrm{Rh}}_{2}$${\mathrm{O}}_{4}$, Co${\mathrm{Cr}}_{2}$${\mathrm{O}}_{4}$, Co${\mathrm{Mn}}_{2}$${\mathrm{O}}_{4}$, and Zn${…
Using temperature as a pitting criterion, the effects of Mo and other supplementary alloying additions on the pit initiation resistance of wholly austenitic stainless steel containing nominally 18% Cr have been evaluated. Quantitative results for Mo, Cu, Ni, Mn, N, and Si alloy additions are presented and empirical re…
It is predicted theoretically and justified experimentally that infrared reflectances are proportional to the concentrations of the vibrational species causing them. In the binary Li 2 O-, Na 2 O-, and K 2 O-SiO 2 glasses used in this study, the reflection peaks have been assigned to vibrations of single silicon-oxyge…
The Raman spectrum of glassy carbon has been measured. Two broad lines are observed at 1340 and 1590 cm−1. These results are consistent with the turbostratic structure, which has been suggested for glassy carbon, with a particle size La of approximately 30 Å.