Materials Literature
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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…
1. Survey of the Conventional Methods. 2. The Symmetric Group. 3. Applications of the Symmetric Group in Quantum chemistry. 4. The Unitary Group. 5. The Unitary Group Formulation of Quantum Chemistry. 6. Computational Applications. 7. Theoretical Organic Chemistry (A Pedagogical Chapter). 8. Symmetry-Adaptation. 9. Fr…
The anodic electropolymerisation of long-chain 3-substituted pyrroles and thiophenes gives highly conducting polymeric materials, some of which are soluble in common organic solvents in the conducting state.
The switching process of a surface stabilized ferroelectric liquid crystal cell is considered on the basis of disclination dynamics for various cell thicknesses. In this report we first summarize the surface stabilized ferroelectric liquid crystal states and their boundaries, and then examine the switching characteris…
A series of thermotropic poly(1,4-phenylene-2,5-di-n-alkoxy terephthalate)s with the length of the n-alkoxy side chains being varied between n = 2 and n = 18 carbon atoms has been examined by optical microscopy, x-ray diffraction and DSC. All members of this series have a rigid backbone with attached flexible side cha…
摘要 用x 射线粉晶衍射方法(XRD ) 研究了不同温度下脱水的蒙脱石样品, 发现经一定程度的脱水蒙脱石(00l )特征衍射会消失, 在一定条件下又可再现.讨论了其结晶学意义及可能的相变过程. Abstract Montmorillonite samples treated at different temperatures had been studied by XRD. The (00l) reflections of some samples disappeared, and reappeared under some conditions. The crystallographic significance and the…
Abstract A difference between surface and bulk morphologies of extruded low density polyethylene (LDPE) has been observed through measurement of the contact angle of glycerol on both exterior and interior surfaces of the extrudate. The sessile drop contact angle on the exterior surface of LDPE rods prepared in a Brabe…
Corrosion resistance is an important characteristic of many types of metallic and inorganic coating systems. Corrosion resistance of coatings usually involves appearance maintenance as well as protection from structural damage. Corrosion tests have been an important approach for evaluating the type and extent of damag…