Yong-Jun Lee、Isamu Akiba、Saburo Akiyama2002-11-12Journal of Applied Polymer Science
Abstract The effect of siloxane chain length on surface segregation of poly(methyl methacrylate)‐grafted poly(dimethyl siloxane) (PMMA‐ g ‐PDMS)/poly(2‐ethylhexyl acrylate‐ co ‐acrylic acid‐ co ‐vinyl acetate) [P(2EHA‐AA‐VAc)] blends was investigated. The blends of PMMA‐ g ‐PDMS with P(2EHA‐AA‐VAc) showed surface segr…
Phase Equilibria and ThermodynamicsAdvanced Polymer Synthesis and CharacterizationPolymer Nanocomposites and Properties
Mario Pegoraro、Alessandro Galbiati、Giuliana Ricca2002-11-12Journal of Applied Polymer Science
Abstract Polyurethane prepolymers prepared from toluene 2,4‐diisocyanate, toluene 2,6‐diisocyanate, and polypropylene glycol with a ratio between the isocyanate and hydroxyl groups equal to 2 were analyzed by 1 H nuclear magnetic resonance (NMR) spectroscopy in acetone‐d 6 . Different temperatures and concentrations w…
Polymer composites and self-healingCultural Heritage Materials AnalysisNMR spectroscopy and applications
Stephan Irle、Alf Mews、Keiji Morokuma2002-11-12The Journal of Physical Chemistry A
Changes upon oxidization of carbon nanotubes (CNTs) in structure and Raman spectra are investigated using geometry optimizations and frequency calculations with density functional theory and ONIOM(MO:MO) methods. Macrocycles consisting of six and 12 fused C 6 hexagon units, C 24 H 12 and C 48 H 24 or [6]- and [12]-cyc…
Carbon Nanotubes in CompositesGraphene research and applicationsFullerene Chemistry and Applications
Hideto Tsuji、Tamami Yamada2002-11-12Journal of Applied Polymer Science
Abstract Poly( L ‐lactide), that is, poly( L ‐lactic acid) (PLLA), poly(ε‐caprolactone) (PCL), and their blend (50/50) films containing different amounts of poly( L ‐lactide‐ co ‐ε‐caprolactone) (PLLA‐CL), were prepared by solution casting. The effects of added PLLA‐CL on the enzymatic hydrolysis of the films were inv…
biodegradable polymer synthesis and propertiesMicroplastics and Plastic PollutionMuscle metabolism and nutrition
Guo‐Li Yuan、Noriyuki Kuramoto2002-11-12Macromolecules
Water-processable molecular complexes between dextran sulfate (DSA) and polyaniline derivatives (PANIs) have been synthesized by chemical polymerization of corresponding achiral monomer in the presence of DSA. The formation of the macromolecular complex was proved by the FTIR and UV−vis spectra. Interestingly, chiral…
Organic Electronics and PhotovoltaicsConducting polymers and applicationsPolydiacetylene-based materials and applications
Elena Cariati、Dominique Roberto、Renato Ugo 等 6 位作者2002-11-12Chemistry of Materials
X-ray crystal structures, solid-state photoluminescence, and Kurtz−Perry powder second harmonic generation (SHG) efficiencies of two novel noncentrosymmetric polymeric adducts of CuI with 4-acetylpyridine, a double-stranded “stair” and a single-stranded “chain”, are reported, the latter being a rare example of a [CuX(…
Crystal structures of chemical compoundsCrystal Structures and PropertiesNonlinear Optical Materials Research
Jay A. Switzer、Run Liu、Eric W. Bohannan 等 4 位作者2002-11-12The Journal of Physical Chemistry B
Epitaxial films of cuprous oxide, Cu 2 O, are electrodeposited from aqueous solution onto single-crystalline Si(001). The epitaxial growth of Cu 2 O onto Si is an unexpected result, because there is a strong driving force for the oxidation of Si to form a native amorphous SiO 2 layer. The Cu 2 O films are single-cryst…
ZnO doping and propertiesSemiconductor materials and devicesCopper-based nanomaterials and applications
Yuichi Terazono、Brian O. Patrick、David Dolphin2002-11-12Inorganic Chemistry
Zinc(II) complexes of antipodal beta-tetrasubstituted meso-tetraphenylporphyrin with trifluoromethyl (Zn(TPP(CF(3))(4)) (1a)), bromine (Zn(TPPBr(4)) (2a)), and methyl groups (Zn(TPP(CH(3))(4)) (3a)) were synthesized in order to examine the steric and the electronic effects of trifluoromethyl groups on the macrocycle.…
Molecular Sensors and Ion DetectionPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
Xi Lin、K. C. Hass、William F. Schneider 等 4 位作者2002-11-12The Journal of Physical Chemistry B
An extensive search for stable chemisorbed SO 2 configurations on the Pt(111) surface has been performed using first-principles DFT−GGA calculations. The most energetically stable configurations, η 2 -S b,O a and η 3 -S a,O a,O a at fcc sites, where η 2 and η 3 mean that the number of atoms of the adsorbate coordinate…
Advanced Chemical Physics StudiesCatalytic Processes in Materials ScienceChalcogenide Semiconductor Thin Films
Ye Liu、Tai‐Shung Chung2002-11-12Journal of Polymer Science Part A Polymer Chemistry
Abstract Facile syntheses of hyperbranched polyimides were realized by the polymerization of A 2 + BB ′ 2 monomers, 2,2‐bis(3,4‐dicarboxylphenyl) hexafluoropropane dianhydride (6FDA) + 2,4,6‐triaminopyrimidine (TAP), performed by mixing the monomers together in N ‐methylpyrrolidone at 17% w/v concentrations with molar…
RNA Interference and Gene DeliveryDendrimers and Hyperbranched PolymersSynthesis and properties of polymers
Zouheir Sekkat、Daisuke Yasumatsu、Satoshi Kawata2002-11-12The Journal of Physical Chemistry B
We show that the occurrence of pure photoorientation by photoisomerization of azo dye in polymers is influenced by the polymer molecular structure, as well as by the photoisomerization quantum yields and the cis → trans thermal isomerization rate. These findings are rationalized by the study of the photoorientation of…
Photochemistry and Electron Transfer StudiesPhotochromic and Fluorescence ChemistryPhotopolymerization techniques and applications
Izabela Schmidt、Piotr J. Chmielewski、Z. Ciunik2002-11-12The Journal of Organic Chemistry
An efficient and simple method of modification of "inverted" porphyrin is provided by reactions of 5,10,15,20-tetraaryl-2-aza-21-carbaporphyrinatonickel(II) 2 with dihalogenalkanes under basic conditions. The substituents are bound to the internal carbon or external nitrogen of the inverted pyrrole depending on dihalo…
Porphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation MechanismsPorphyrin Metabolism and Disorders
Ying‐Ling Liu、Yie Chan Chiu、Chuan Shao Wu2002-11-12Journal of Applied Polymer Science
Abstract Epoxy resins containing both phosphorous and silicon were prepared via the fusion process of reacting a phosphorous diol and a silicon diol with a bisphenol‐A‐type epoxy. With various feeding ratios of the reactants, epoxy resins with different phosphorous and silicon contents were obtained. Through curing th…
Epoxy Resin Curing ProcessesFlame retardant materials and propertiesSilicone and Siloxane Chemistry
C. Vaysse、Liliane Guerlou‐Demourgues、Claude Delmas2002-11-12Inorganic Chemistry
The thermal evolution, from room temperature up to 300 degrees C, of layered double hydroxides (LDHs) with (Ni, Co) or (Ni, Fe) based slabs and containing intercalated carbonate anions, was studied. A new lamellar phase, exhibiting a 6.5-6.6 A interslab distance, was observed in the 200-260 degrees C temperature range…
Supercapacitor Materials and FabricationLayered Double Hydroxides Synthesis and ApplicationsThermal Expansion and Ionic Conductivity
Jinzhu Zhang、Xin Wang、Lude Lu 等 5 位作者2002-11-12Journal of Applied Polymer Science
Abstract High‐impact polystyrene (HIPS)/nano‐TiO 2 nanocomposites were prepared by surface pretreatment of nano‐TiO 2 with special structure dispersing agent (TAS) and master batch manufacturing technology. The results show that when the nano‐TiO 2 content is 2%, the notched impact strength, tensile strength, and elas…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesFlame retardant materials and properties
A. Zaoui、W. Sekkal2002-11-12Physical review. B, Condensed matter
Recent ultrasonic experiments on single-crystal specimens of the wurtzite $(B4)$ phase of ZnO have shown that, under pressure, this material becomes softer against shear-type acoustic distortions. In the light of these results, we have performed atomistic calculations based on an interatomic pair potential within the…
ZnO doping and propertiesHigh-pressure geophysics and materialsAcoustic Wave Resonator Technologies
Mats Johnsson、Karl W. Törnroos、P. Lemmens 等 4 位作者2002-11-12Chemistry of Materials
Two new transition-metal tellurium oxy-chlorides of the general formula Ni 5 (TeO 3 ) 4 X 2 (X = Cl, Br) have been isolated during the investigation of the ternary phase diagram NiO−NiCl 2 −TeO 2 . They crystallize in the monoclinic system, space group C 2/ c, and for the case of Ni 5 (TeO 3 ) 4 Cl 2 the unit cell is…
Magnetism in coordination complexesCrystal Structures and PropertiesAdvanced Condensed Matter Physics
Wei Liu、Jayant Kumar、Sukant K. Tripathy 等 4 位作者2002-11-12Langmuir
Peroxidase-catalyzed template-guided polymerization of aniline has been carried out in aqueous micellar solutions of surfactants, such as sodium dodecylbenzenesulfonate, (SDBS), hexadecyltrimethylammonium bromide (CTAB), and polyoxyethylene(10) isooctylphenyl ether (Triton X-100). The properties of these enzymatically…
Electrochemical sensors and biosensorsConducting polymers and applicationsElectrochemical Analysis and Applications
Tunna Baruah、Mark R. Pederson2002-11-12arXiv
Accurate density-functional based calculations have been performed on the Co_4(hmp)_4(CH_3OH)_4Cl_4 molecular magnet where hmp is deprotonated hydroxymethyl pyridine. In addition to the experimentally observed staggered geometry, we identify two isomers, referred to as eclipsed and half-staggered/half-eclipsed, that a…
Materials Science
Tunna Baruah、Mark R. Pederson、M. L. Lyn 等 4 位作者2002-11-12arXiv
Using a density-functional based algorithm, the full IR and Raman spectra are calculated for the neutral Ti_8C_12 cluster assuming geometries of Th, Td, D2d and C3v symmetry. The Th pentagonal dodecahedron is found to be dynamically unstable. The calculated properties of the relaxed structure having C3v symmetry are f…
Materials Science