Amorphous thermoreversible gebs of atadic polystyrene
Solution dans la dicaline; le refroidissement conduit a une vitrification. Influence de la concentration du solvant sur la temperature de transition vitreuse
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Reactivity 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 measurements
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…
Helical conformations in a polyamide of the nylon-3 family
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…
Syntheses of Liquid Crystalline Phthalocyanines
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…
Electroactive copolymers of pyrrole containing covalently bound dopant ions: poly{pyrrole-co-[3-(pyrrol-1-yl)propanesulphonate]}
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.
A new and efficient biomimetic system for hydrocarbon oxidation by dioxygen using manganese porphyrins, imidazole, and zinc
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.
Dislocation cores in semiconductors. From the « shuffle or glide » dispute to the « glide and shuffle » partnership
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…
Sequence-targeted chemical modifications of nucleic acids by complementary oligonucleotides covalently linked to porphyrins
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…
Vibrational electron energy loss spectroscopic study of benzene, toluene, and pyridine adsorbed on palladium(111) at 180 K
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…
Gelation of Aluminum Hydroxide Sols
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 charge storage mechanism of conducting polymers: a voltammetric study on defined soluble oligomers of the phenylene–vinylene type
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.
Expansion of a polymer chain with excluded volume interaction
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…
Sustained catalytic homogenous oxo-transfer oxidation of alkanes. Interaction of alkyl hydroperoxides with transition metal-substituted polyoxometalates
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.
Adhesion and interface studies between copper and polyimide
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…
Polylactic acid microspheres containing quinidine base and quinidine sulphate prepared by the solvent evaporation technique. I. Methods and morphology
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…
The Unitary Group in Quantum Chemistry
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…
Soluble, conducting polymers from 3-substituted thiophenes and pyrroles
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.
Switching Process in Ferroelectric Liquid Crystals; Disclination Dynamics of the Surface Stabilized States
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…
Rigid Rod Polymers Having Flexible Side Chains. 3. Structural Investigations on a Novel Layered Mesophase Formed by Thermotropic Poly(1,4-phenylene-2,5-dialkoxy terephthalate)s
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…
DISAPPEARANCE AND REAPPEA-RANCEOFTHE(00l) REFLECTIONS OF MONT MORILLONITE
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…