Materials Literature
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Abstract The effects of pendant groups on gas transport were investigated using a series of substituted polystyrenes. Permeability coefficients were measured at 35°C and 1 atm for He, N 2 , O 2 , CH 4 , and CO 2 , and diffusion coefficients were calculated from time lag data. The absolute permeabilities for the polyst…
Structural images of the stacking faults in β‐SiC were obtained with a high‐resolution electron microscope. Stacking faults initially present in β‐SiC powder particles were eliminated as grain growth proceeded at elevated temperatures.
Diffusion of water into silica glass was measured in the temperature range of 200° to 750° by treating the glass in air containing a constant water vapor pressure and analyzing the concentration profile using a Fourier transform infrared spectrometer. In the short‐time diffusion heat treatments, the surface concentrat…
An aqueous injection molding process based on the gelling properties of certain naturally occurring polysaccharides, in particular agar, and its purified derivative, agarose, is described. The materials form nonviscous solutions at temperatures near 100°C which solidify to rigid gels upon cooling below the so‐called g…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the physical meaning of the Kwei equation for the glass transition temperature of polymer blendsAnshyang A. Lin, T. K. Kwei, and Arnost ReiserCite this: Macromolecules 1989, 22, 10, 4112–4119Publication Date (Print):October 1, 1989Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility of ammonia in pure aqueous and multicomponent solutionsS. L. Clegg and P. BrimblecombeCite this: J. Phys. Chem. 1989, 93, 20, 7237–7248Publication Date (Print):October 1, 1989Publication History Published online1 May 2002Published inissue 1 October 1989https://pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural changes of native cellulose crystals induced by annealing in aqueous alkaline and acidic solutions at high temperaturesHiroyuki Yamamoto, Fumitaka Horii, and Hisashi OdaniCite this: Macromolecules 1989, 22, 10, 4130–4132Publication Date (Print):October 1, 1989Publ…
Wave functions on a Fibonacci lattice are analyzed from the multifractal point of view. An entropy function [f(\ensuremath{\alpha})] which represents the distribution of a particle probability density is obtained exactly for the state at the center of the spectrum. Numerical calculations for other states are also pres…
Data on the hydrogen release from a-C:H induced by ion irradiation have been analyzed using a statistical model based on bulk molecular recombination. Good fits were obtained for all available data by adjusting a single parameter which is correlated to the stopping power of the projectile in the material.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVery strong binding of appropriate substrates by cyclodextrin dimersRonald Breslow, Noam Greenspoon, Tao Guo, and Ryszard ZarzyckiCite this: J. Am. Chem. Soc. 1989, 111, 21, 8296–8297Publication Date (Print):October 1, 1989Publication History Published online1 May 2002Publis…
Abstract Today, material science is directed towards the development of multifunctional and oriented structures. One example of such supramolecular systems are liquid crystalline (LC) elastomers which combine the properties of LC phase (the combination of order and mobility) with rubber elasticity, one of the most typ…
Abstract A review is presented of work carried out over the last 40 years on non-porous sorbents and on microporous shape-selective sorbents derived from palygorskite, smectite, and vermiculite. Among such materials four kinds of behavior were observed. In some systems uptake was restricted to external surfaces; in ot…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb initio calculations of polarizabilities and second hyperpolarizabilities in organic molecules with extended .pi.-electron conjugationPratibha Chopra, Louis Carlacci, Harry F. King, and Paras N. PrasadCite this: J. Phys. Chem. 1989, 93, 20, 7120–7130Publication Date (Print…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Transmission Laue diffraction photographs can be recorded with short exposure times from stationary macromolecular and small-molecule crystals. With the use of a broad wavelength band a very large number of reflections is stimulated in a single `snapshot' of large regions of reciprocal space. Processing software has b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic and Raman spectroscopic properties of oxo-bridged dinuclear iron centers in proteins and model compoundsJoann Sanders-Loehr, William D. Wheeler, Andrew K. Shiemke, Bruce A. Averill, and Thomas M. LoehrCite this: J. Am. Chem. Soc. 1989, 111, 21, 8084–8093Publicatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray diffraction study of mesophases of cetyltrimethylammonium bromide in water, formamide, and glycerolX. Auvray, C. Petipas, R. Anthore, I. Rico, and A. LattesCite this: J. Phys. Chem. 1989, 93, 21, 7458–7464Publication Date (Print):October 1, 1989Publication History Publ…
In order to study the effects of factors governing the bioabsorption rate of polylactides, implantation tests were carried out in rabbits using various samples (20 x 10 x 2 mm3) differing in their chemical composition, residual monomer content, and molecular orientation. Copolymer samples with a higher lactic acid con…
The orientation distribution function (ODF) of the crystallites of polycrystalline materials can be calculated from experimentally measured pole density distribution functions (pole figures). This procedure, called pole-figure inversion, can be achieved by the series-expansion method (harmonic method). As a consequenc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new molecular ordering in helical liquid crystalsJ. W. Goodby, M. A. Waugh, S. M. Stein, E. Chin, R. Pindak, and J. S. PatelCite this: J. Am. Chem. Soc. 1989, 111, 21, 8119–8125Publication Date (Print):October 1, 1989Publication History Published online1 May 2002Published…