Materials Literature
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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…
The gelation of aluminum hydroxide sols obtained from aluminum sec ‐butoxide has been studied as a function of the conditions of preparation, including pH, temperature, and time of aging. The preceding studies of Yoldas have been extended in more acidic conditions, up to a molar proportion of 1.12 HNO 3 per Al(OC 4 H…
The reductive charging–discharging behaviour of several newly synthesized soluble oligo-p-phenylene-vinylenes was studied by cyclic voltammetry; the results show that both the number of redox states and the magnitude of their energetic interaction depend on the chain length of the corresponding oligomer.
We present explicit values of the mean square end-to-end distance 〈R2〉 of a linear flexible chain for all values of the excluded volume parameter z>0 in space dimension 3. Our results are obtained by performing series analyses of our earlier sixth-order perturbation calculation using Borel summation technique a…
The oxo-transfer oxidation of alkanes by t-butyl hydroperoxide can be catalysed by particular transition metal-substituted heteropolytungstates; the product yields and the stabilities of these systems are higher than those of other homogenous catalytic alkane oxygenation systems reported in the literature.
The adhesion and interface structure between copper and polyimide have been studied. Polyimide films were prepared by spinning a polyamic acid solution (Du Pont PMDA-ODA) in an NMP solvent onto a Cu foil, followed by thermal curing up to 400°C. The adhesion strength was measured by a 90° peel test. The peel strength o…
D,1-polylactic acid (PLA) microspheres containing the antiarrhythmic drug, quinidine, were prepared by the solvent evaporation method. The drug was present as either the base or as the sulphate salt. A slight modification in the process resulted in high yields of free-flowing, non-aggregated microspheres. The successf…