Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of oxygen isotopic exchange over ultraviolet irradiated anatase samples and comparison with the photooxidation of isobutane into acetoneHenri Courbon, Marc Formenti, and Pierre PichatCite this: J. Phys. Chem. 1977, 81, 6, 550–554Publication Date (Print):March 1, 1977Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDomain-Boundary Structure of Styrene-Isoprene Block Copolymer Films Cast from Solutions. 2. Quantitative Estimation of the Interfacial Thickness of Lamellar Microphase SystemsTakeji Hashimoto, Akira Todo, Hideyuki Itoi, and Hiromichi KawaiCite this: Macromolecules 1977, 10,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature Dependence of Hydrogen Bonding in Toluene Diisocyanate Based PolyurethanesC.S. Paik Sung and N S SchneiderCite this: Macromolecules 1977, 10, 2, 452–458Publication Date (Print):March 1, 1977Publication History Published online1 May 2002Published inissue 1 March 1…
Summary Adsorption isotherms, the infrared spectra of adsorbed species, and the amount of hydroxyl released when oxalate is adsorbed, all indicate that adsorption of oxalate, benzoate and phosphate at low solution concentrations occurs only on A1(OH)(H 2 O) sites exposed on edge faces of the platy gibbsite crystals st…
A mathematical model is developed and methods of analysis are formulated for determining the structural response of the single-lap and symmetric-lap joints composed of generally orthotropic material systems. Analytical results are compared in both instances with experimental data and excellent correlation is seen to e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStable heptamethine pyrylium dyes that absorb in the infraredG. A. Reynolds and K. H. DrexhageCite this: J. Org. Chem. 1977, 42, 5, 885–888Publication Date (Print):March 1, 1977Publication History Published online1 May 2002Published inissue 1 March 1977https://pubs.acs.org/d…
Abstract The properties of mixtures of poly(2, 6‐dimethyl p‐phenylene oxide) and poly(styrene) have been measured by DSC, density gradient, dynamic mechanical response, and tensile testing. The mixtures are found to have single glass trasitions that vary continuously with the composition. They also have small negative…
Abstract Nylon 6 can exist in either of two stable crystal structures, the α crystal with hydrogen bonds between antiparallel chains or the γ crystal with hydrogen bonds between parallel chains. Both structures have been observed in the same highly annealed fiber, suggesting that the polymer should not be regarded as…
The effects of Dy doping and sintering parameters on the properties of BaTiO 3 ceramics were studied. The average grain size decreases with increasing Dy content and is controlled at ∼1.5 μ m by 0.8 at.% Dy. The Curie temperature change, associated with ≤1.2 at.% Dy, is <3°C. The dielectric constant is ∼2600 for sp…
Abstract The photodegradation of cellulose acetate fibers by ultraviolet light in vacuo at 77°K and at ambient temperature was studied. Three kinds of light sources with different wavelengths between 2353 and 6000 Å were employed. ESR studies at 77°K show that several kinds of free radicals are produced from cellulose…
Fluorite, halite, periclase, and sylvite have been abraded in a wind tunnel by windblown dust from the "normal" air of the intake room plus or minus introduced silt-sized particles of calcite, barite, or snow. The results indicate that the effective kinetic energy of a projectile and the bond strength of the target-ra…
The evolution of enthalpy of As 2 Se 3 glass during structural relaxation in the glass transition region was measured via differential scanning calorimetry for two types of time‐temperature programs: rate‐heating at 10 K/min following a cool at a constant rate (‐20 to ‐0.31 K/min) and isothermal annealing following a…
The first order Raman spectrum of the layer type semiconducting compound, WSe 2 , has been investigated. The frequencies of the Raman active A 1g , E 2g 1 E 1g , and E 2g 2 modes have been determined to be 253,250, 178, and 25 cm −1 respectively. Using a scaling relation the results have been compared to the values ob…
Abstract The effects of hydrostatic pressure on the shear, compressive, and tensile stress‐strain behavior of both amorphous and crystalline polymers are reviewed and illustrated. For polymers with T g near to but below ambient temperature, there is a steep increase of modulus with pressure and, above some critical pr…
In the transition between the CsCl-type and NaCl-type structures, caesium chloride retains a definite orientation relation of [110] (CsC1) || [100] (NaC1) and [001] (CsC1) || [011] (NaCl). The closest-packing planes of both structures are retained in the transition and have an approximately equal density of ions at th…
Adsorption of N 2 and water vapor was studied in completely hydrated tricalcium silicate and in fully hydrated tricalcium silicate from which Ca(OH) 2 had been extracted. Compared with results obtained using N 2 , water vapor adsorption led to increased values for small‐pore volume, peak shifts to smaller sizes, and d…
Abstract Nylon 46 was synthesized from the salt of 1,4‐diaminobutane and adipic acid. High molecular weight polymers could be obtained by reaction for 1 hr at 215°C in a closed system and at least for 1 hr in vacuo at a temperature in the range 290–305°C. The reactions at 290°C were found to have taken place in the so…
The solubilities of apatites of varying compositions were measured as a function of pH in seawater at 10° and 25°C. Wide ranges of solubilities were observed; at pH = 7.4 they ranged from 0.4 to 11 µ M PO 4 ‐P liter −1 , depending on the nature of the samples. Results are interpreted in terms of complex coatings forme…
A three-dimensional analysis is presented for high velocity impact problems. A Lagrangian finite-element technique is formulated for tetrahedron elements subjected to large strains and displacements. The effects of material strength and compressibility are included to account for elastic-plastic flow and wave propagat…
Abstract Massachusetts Institute of Technology Cambridge, Massachusetts 02.139 The phenomenology of plastic deformation in glassy polymers is described, and a theory based on a molecular model for such deformation is presented and contrasted with other published theories. A phenomenological yield criterion is presente…