Materials Literature
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Abstract The transport properties of water in neat poly(aryl‐ether‐ether‐ketone) (PEEK) coupons (2 to 6 mm thick) were investigated by gravimetric and mass spectrometric methods. The solubility of water increases from 0.44 wt.% at 35°C to 0.55 wt.% at 95°C; the temperature coefficient is 8 kJ/mol (1.9 kcal/mol). The d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTpH dependence of surface-enhanced Raman scattering spectra from 2,2'-bipyridine adsorbed on silver colloidsMunsok. Kim and Koichi. ItohCite this: J. Phys. Chem. 1987, 91, 1, 126–131Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Publishe…
The hydrogen absorption/desorption (HAD) behaviours of alloys based on Nd 15 Fe 77 B 8 (Neomax composition) and the stoichiometric phase Nd 2 Fe 14 B have been examined in an attempt to relate these effects to the microstructures of these alloys. The HAD processes were studied by microbalance, Differential Thermal Ana…
A test cycle with electrical, thermal and combined stresses has been performed on models of XLPE insulated: cables in order to characterize this type of cable from the viewpoint of endurance to combined stresses. For this purpose the method of Combined Analysis of experimental data has been used, thus permitting the g…
Characteristic features of the liquid-liquid phase separation process in polymer systems are presented, followed by a concise review of existing studies on phase-separation kinetics in polymer solutions and mixtures. Brief discussions have been made on two selective topics in this field, i.e., applicability of Cahn's…
High temperature embrittlement due to helium is controlled by helium-assisted cavity formation on grain boundaries. The basic mechanisms, underlying this process are discussed: bubble nucleation and growth, bubble-void conversion and void growth, crack formation by void coalescence. Differences between the microstruct…
Water absorption experiments have been carried out on three DGEBA type epoxy resins. A reactive diluent added to the resin increased water permeation, while a monomer that expanded on cure decreased it. Exposure at 97% relative humidity (RH) gave results that closely paralleled those obtained by water immersion, thoug…
A new method for preparing homogeneous cordierite ceramics by a sol-gel process is described. Reactive and fine cordierite-type amorphous powder with high homogeneity was prepared by the sol-gel method. The hydrolysis of metal alkoxides used as starting materials was controlled. Namely, Si(OC2H5)4, with a hydrolysis r…
Description Thirty-one papers cover several interrelated investigations: mechanical properties of porous coatings and substrates; characterizations of pore dimensions; biodegradation and biological analysis; performance in human and laboratory animals; modeling and implant fixation; and systems for future applications.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation, spectroscopic properties, and electrochemical properties of two oligomeric silicon phthalocyaninesDavid W. DeWulf, Jonathan K. Leland, Bob L. Wheeler, Allen J. Bard, Daniel A. Batzel, David R. Dininny, and Malcolm KenneyCite this: Inorg. Chem. 1987, 26, 2, 266–270…
For the numerical calculation of the interfacial energy between (111) fcc and (110) bcc planes by Gotoh and Arai, a geometrical interpretation based on the atomic structure is presented. The relationships of Nishiyama-Wassermann (N-W) and Kurdjumov-Sachs (K-S) are explained by the configuration of bcc and fcc atoms wh…
Solution dans la dicaline; le refroidissement conduit a une vitrification. Influence de la concentration du solvant sur la temperature de transition vitreuse
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactivity of carboxylic acid and ester groups in the functionalized interfacial region of "polyethylene carboxylic acid" (PE-CO2H) its derivatives: differentiation of the functional groups into shallow and deep subsets based on a comparison of contact angle and ATR-IR measu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHelical conformations in a polyamide of the nylon-3 familyJ. M. Fernandez-Santin, S. Munoz-Guerra, A. Rodriguez-Galan, J. Aymami, J. Lloveras, J. A. Subirana, E. Giralt, and M. PtakCite this: Macromolecules 1987, 20, 1, 62–68Publication Date (Print):January 1, 1987Publicatio…
All articles of this category The syntheses of peripherally substituted metal phthalocyanines (C 8 H 17 OCH 2 ) 8 PcM with M = Co, Ni and Pb are described. The macrocycle (C 8 H 17 OCH 2 ) 8 PcCo is reacted with sodium cyanide under oxidative conditions to give the cyano-bridged compound [(C 8 H 17 OCH 2 ) 8 PcCoCN] n…
A self-doped electroactive copolymer, poly{pyrrole-co-[3-(pyrrol-1-yl)propanesulphonate]}, in which the charge balancing counterion is covalently attached to the polymer chain, has been synthesized and cation controlled charge transport parameters have been evaluated.
Epoxidation of alkenes and hydroxylation of alkanes by dioxygen and Zn as a reducing agent, with good yields (up to 50%) based on Zn and rates (up to 200 turnovers of the catalyst per hour), were achieved by using manganese porphyrin catalysts in the presence of 1-methylimidazole and acetic acid.
Possible geometrical structures for dislocation cores in elementary and compound semiconductors are shown and discussed in the light of a review of recent work in HREM and core energy calculations. It appears that partial dislocations have complex cores, with an average glide character, but containing a number of shuf…
Oligo-heptathymidylates covalently linked to porphyrins bind to complementary sequences and can induce local damages on the target molecule. In dark reactions, iron porphyrin derivatives exhibited various chemical reactivities resulting in base oxidation, crosslinking and chain scission reactions. Reactions induced by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational electron energy loss spectroscopic study of benzene, toluene, and pyridine adsorbed on palladium(111) at 180 KV. H. Grassian and E. L. MuettertiesCite this: J. Phys. Chem. 1987, 91, 2, 389–396Publication Date (Print):January 1, 1987Publication History Published o…