Materials Literature
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Abstract We present a new method for studying the influence of flame retardants as a function of time and temperature by measuring the X‐ray absorption spectra of the corresponding additive. Here, red phosphorus in polyamide 6,6 was investigated at the phosphorus K‐edge using synchrotron radiation. The thermo‐oxidativ…
The history of organic photochromies for potential military and commercial applications, especially the efforts at NCR Corp. during 1955–1972, is recalled. Impractical then because of “fatigue,” organic photochromies are now useful for ophthalmic lenses, optical information processing, and photocontrol of physical pro…
Abstract A new series of high flow PMR‐type addition curing polyimides was developed, which employed the substitution of 2,2′‐bis(trifluoromethyl)‐4,4′‐diaminobiphenyl (BTDB) for p ‐phenylenediamine ( p ‐PDA) in a PMR‐II formulation. These thermoset polyimides, designated as 12F resins, were prepared from BTDB and the…
Growth of single bubbles in a uniformly superheated binary solution containing a non-volatile solute was studied both experimentally, using an aqueous solution of NaCl at mass fractions of 0.05 and 0.20, an initial temperature range of 40-80°C and an applied initial superheat range of 1.7-16.5°C, and theoretically, wi…
The high resolution crystal structure of crambin has been based on the crystals containing two sequence forms (the mixed form). Here, we report the crystal structure of the sequence isomer having Pro and Leu at residues 22 and 25 (the PL form). This elimination of the sequence heterogeneity resulted in a simpler struc…
Azobenzenophanes with three-carbon bridges can be photoisomerized in both trans to cis and cis to trans directions. Contrary to other aromatic azo compounds the cis, cis form is stable at room temperature with a half life of about a year.
Abstract Results of previously published work involving network analysis and accelerator intermediate analysis of cis -polyisoprene were compared to help correlate and rationalize network/chemistry relationships. Both classical chemical probe network analysis and further NMR measurements (DEPT analysis) were used as n…
Abstract Diimide‐hydrogenated polyoctenamer and polynorbornene have been characterized by FT‐infrared spectroscopy and differential scanning calorimetry (DSC). Hydrogenated polyoctenamer has been studied in comparison with hydrogenated polybutadiene and polyethylene. A crystallinity ranging from 71% to 77% was found,…
A unique system has been developed and used to determine the surface tension of free-standing films of three different liquid-crystal compounds in the smectic phases. The results obtained have been found to be in good agreement with the existing experimental data. For one of these compounds, the surface tension has al…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoatings of Aluminum Oxide and Magnesium Oxide on Carbon Fiber SurfacesYaoming Xie and Peter M. A. SherwoodCite this: Chem. Mater. 1994, 6, 5, 650–657Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 1994https://pubs.ac…
The effects of alkaline treatment on dissolved carbohydrates in suspensions of Norway spruce thermomechanical pulp (TMP) were studied by agitating 1% consistency TMP suspensions at different pH values (5.4 to 12) for 3 h at 60°, followed by acidification and centrifugation to obtain water samples for analysis. It was…
Abstract The physical structure and compatibility of solution‐cast Antheraea pernyi/Bombyx mori silk fibroin blend films were stuided by differential scanning calorimetry (DSC), thermomechanical (TMA) and thermogravimetric (TGA) analysis, dynamic viscoelastic measurement, infrared spectroscopy, and x‐ray diffractometr…
Both tourmaline group and lithium niobate crystals have been found to reaction with water, giving rise to both the pH value variation and the electric conductivity variation. The mechanism of this occurence has been analyzed.
1. A large number of invertebrates have cells that produce intracellular granules of amorphous calcium magnesium phosphates that are thought to act as ion stores or sites of metal detoxification. 2. The interatomic potentials and force constants have been calculated for these ions, and computer simulations of the crys…
β‐dicalcium silicate synthesized by thermal dissociation of hydrothermally prepared hillebrandite (Ca 2 (SiO 3 )(OH) 2 ) exhibits extremely high hydration activity. Characterization of the hydrates obtained and investigation of the hydration mechanism was carried out with the aid of trimethylsilylation analysis, 29 Si…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTricarbonyl(.eta.6-hexachlorobenzene)chromium(0)Paul G. Gassman and Paul A. DeckCite this: Organometallics 1994, 13, 5, 1934–1939Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 1994https://pubs.acs.org/doi/10.1021/om0…
It has long been recognized that Ni-Ti shape memory alloys (SMAs) behave pseudoelastically above the austenite finish temperature (A<SUB>f</SUB>) with an initially very weak strain-hardening character during the transformation. Under conditions of cyclic loading with a maximum strain, (epsilon) <SUB>max</SUB>, the cri…
BACKGROUND: Smooth muscle cell proliferation plays a major role in the genesis of restenosis after angioplasty or vascular injury. Local application of agents capable of modulating vascular responses, including smooth muscle cell proliferation, has been achieved, but difficulty in maintaining active levels locally has…
Abstract A three-dimensional modeling technique is used to characterize the structure of carbon-black aggregates. The relative positions of individual particles in aggregates are determined using transmission electron microscopy (TEM). Data are acquired from two-dimensional projections taken with the aggregates at two…
This paper examines the in situ growth and stability of a single bubble in an effective porous medium, where the pore microstructure is neglected. The main objective of the study is the effect of mass transfer and flow parameters on bubble stability. Because it is necessary for flow in both phases to be considered, th…