Materials Literature
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In this article, silicone rubber/organomontmorillonite hybrid nanocomposites were prepared via a melt-intercalation process. The resulting hybrid nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The results proved that the organ…
We propose two statistical models for description the metal-insulator phase transition coupled with paramagnetic-ferromagnetic phase transition in manganites of the type La_{1-x}Sr_xMnO_3. The first one based on the competition of small polarons and delocalized carriers. In the second one the conductivity appears as a…
Polyurethanes (PUs) of a suitable molar ratio of monomers were found to have shape-memory behavior. In this study, four series of PUs were synthesized by 4,4′-diphenylmethane diisocyanate (MDI), 1,4-butanediol (BD), and various molecular weights of poly(tetramethylene oxide)glycol (PTMO) to study the influence of the…
Micelles formed from polycaprolactone-b-poly(ethylene oxide) (PCL-b-PEO) diblock copolymers were investigated as a novel drug delivery system. The affinity of the micelles for hydrophobic solubilizates was assayed by determining the partition coefficient for the lipophilic compound, pyrene, between the micelles and wa…
Shape-memory polyurethanes (PUs) were synthesized by 4,4′-diphenylmethane diisocyanate (MDI), 1,4-butanediol (BD), and poly(tetramethyl oxide)glycol (PTMO). The morphology of PUs was studied using DSC, DMA, and TEM. The results indicated that the PUs would show different morphology by changing the mol ratio of MDI and…
Ozone decomposition was investigated under reaction conditions by using Raman spectroscopy on a supported manganese oxide catalyst. An adsorbed species with a Raman signal at 884 cm - 1 was observed during reaction, and was identified as a peroxide species by a combination of in situ Raman spectroscopy and 18 O isotop…
The reactions of (por)Os(CO) (por = TPP, TTP, OEP, TMP) with nitrosoarenes (ArNO; Ar = Ph, o-tol) in refluxing toluene generate the (por)Os(ArNO)(2) complexes in 45-76% yields (TTP = 5,10,15,20-tetra-p-tolylporphyrinato dianion, TPP = 5,10,15,20-tetraphenylporphyrinato dianion, OEP = 2,3,7,8,12,13,17,18-octaethylporph…
The luminescent enhancement effect of Y(TTA) 3 Phen (TTA = thenoyltrifluoroacetone; Phen = 1,10-phenanthroline) on Eu(III) in Langmuir−Blodgett (LB) films of rare earth complexes mixing with arachidic acid (AA) in a molar ratio of 1:1 and the intermolecular energy transfer from Y(TTA) 3 Phen to Eu(TTA) 3 Phen in the f…
Transmission electron microscopy has been used in conjunction with RuO 4 staining to investigate the structure of (iPP/iPP- g -MA)−PA6 reaction bonded interfaces and microdeformation at interfaces which had failed by crack propagation along the interface. In relatively weak interfaces, the crack tip was preceded by a…
The molecular dynamics of an 1100 low molecular weight polystyrene are reexamined by photon correlation spectroscopy measurements. The new experimental data combined with recoverable creep compliance data taken previously on the same sample provides information on the local segmental motion in a wide time window of mo…
In this paper, we report on how interaction strength varies with pressure and temperature for several polyolefin mixtures. We find that the interaction energies that govern phase behavior in polymer blends are only a function of density for UCST polyolefin blends far from a critical point. As a result, the effects of…
New π-conjugated polymers constituted of a benzimidazole unit have been prepared. Palladium-catalyzed polycondensation between 4,7-dibromobenzimidazole bearing a hindered phenolic substituent (3,5-di- tert -butyl-4-hydroxyphenyl) and four kinds of diethynylaromatic compounds HC⋮C Ar C⋮CH (e.g., Ar = p -phenylene ( p -…
The Bechgaard salts, an unusual class of organic conductors, have yielded a rich variety of electronic phenomena. In particular, they exhibit low dimensionality, allowing the study of the peculiar behavior of electrons in nearly one-dimensional systems. In their Perspective, Bourbonnais and JA©rome discuss results rep…
Micromachined silicon gratings offer two great advantages to astronomical spectroscopy in the IR: (1) Photolithographic processing techniques permit the production of gratings with much larger groove constants than are possible with conventional wavelength coverage, despite the relatively small format of IR arrays. (2…
The influence of impurities on the morphology of ε-caprolactam crystals was examined in terms of molecular recognition processes at the crystal/solution interface. Summing the intermolecular interactions, using the atom−atom approximation together with the DREIDING force field provided a convergence in the lattice ene…
The space charge characteristics in cross-linking polyethylene ( LPE) are investigated under various electrical stresses from dc to power frequency. The pulsed electro-acoustic method is improved to meet the needs of measurement under ac voltages. The frequency and phase angle dependences of the space charge are studi…
A series of thin films of blends of poly(styrene- d 8 ) and poly(styrene- co - p -bromo x -styrene), where 1 ≥ x ≥ 0, cast on to silicon wafers are examined by atomic force microscopy, X-ray photoelectron spectroscopy, and static secondary ion mass spectrometry. Films deposited on wafers stripped of the native oxide a…
Intensity of the surface-enhanced Raman scattering (SERS) of 1-propanethiol adsorbed on a silver film prepared chemically has been measured over the 15−300 K surface temperature range. A reversible change in the SERS intensity with the temperature has been observed, with the intensity at 15 K being larger than that at…
Reactions of semicrystalline poly(ethylene terephthalate) (PET) film with 3-aminopropyltrialkoxysilanes at the film−solution interface and subsequent hydrolysis render silanol (Si−OH) functionality that is attached to the PET surface by amide linkages (PET−CONH(CH 2 ) 3 Si(OH) 3 ). Toluene was found to be the preferre…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTArtificial Spinning of Spider SilkAndreas Seidel, Oskar Liivak, and Lynn W. JelinskiView Author Information Center for Advanced Technology in Biotechnology, 130 Biotechnology Building, Cornell University, Ithaca, New York 14853 Cite…