Materials Literature
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Stress relaxation of model poly(dimethylsiloxane) networks with pendant chains and nearly constant cross-linking density was studied. The networks were obtained by end-linking a mixture of long chains bearing terminal reactive groups with a trifunctional cross-linker. Long poly(dimethylsiloxane) chains in the initial…
Water uptake in diglycidyl ether of butanediol (DGEB) epoxy cured with 4,4‘-diaminodiphenyl sulfone (DDS) was studied using UV reflection spectroscopy. There is a progressive shift to longer wavelength of approximately 13 nm for the DDS reflection peak at 338 nm upon exposure to water, apparently due to hydrogen bondi…
The emission and excitation properties of a SrB 4 O 7 :1% Pr 3+ powder sample and a Sr 0.7 La 0.3 Al 11.7 Mg 0.3 O 19 :3.5% Pr 3+ single crystal were investigated using x-ray and synchrotron radiation. The 4f5d states of Pr 3+ in these host lattices are at a higher energy than the 4f 2 [ 1 S 0 ] state. In the hexa-alu…
Crystals of Cu(II)(NO(3))(2)(pm)(3) (1), and two crystalline forms of Cu(II)(NO(3))(2)(H(2)O)(2)(pm)(2), (2) and (3), showed ferromagnetic, antiferromagnetic and paramagnetic interactions at extremely low temperatures, respectively. Crystal structure analyses revealed that the complexes were catena-dinitrato[mu-pyrimi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTTransmission Electron Microscopy Observations on Lamellar Melting of Cold-Crystallized Isotactic PolystyreneTianxi Liu, Juergen Petermann, Chaobin He, Zhehui Liu, and Tai-Shung ChungView Author Information Advanced Polymers and Chem…
It was shown that axial pressure strongly changes the dielectric and ferroelectric properties of Na0.5Bi0.5TiO3 ceramic. This includes: (i) the shift of rhombohedral–tetragonal phase transition to higher temperature, suppressing the dielectric dispersion, and reduction of thermal hysteresis of the electric permittivit…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTTrap State Emission from TiO2 Nanoparticles in Microemulsion SolutionsHirendra Nath Ghosh and Soumyakanti AdhikariView Author Information Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India Cite this: Langmuir 2001, 17…
Poly(styrenesulfonate) (PSS) was adsorbed reversibly from aqueous CsCl or NaCl solutions onto oppositely charged DODAB (diocatadecyldimethylammonium bromide) monolayers at the water surface. By adjusting the DODAB lateral density, the surface charge of the liquid interface is varied. The electron density profile of th…
Three-dimensional superlattices forming films oriented along the substrate and dots deposited on a film made of 8 nm cobalt nanocrystals have been fabricated. The magnetic properties of such artificial structures are compared.
Four novel low-spin bis(amine) Co(III) porphyrins [Co(TPP)(BzNH(2))(2)](SbF(6)), 1, [Co(TPP)(1-BuNH(2))(2)](SbF(6)), 2, [Co(TPP)(PhCH(2)CH(2)NH(2))(2)](SbF(6)), 3, and [Co(TPP)(1-MePipz)(2)](SbF(6)), 4, have been synthesized and characterized by low-temperature X-ray crystallography, IR, electronic, and NMR ((1)H, (13…
We analyze a self-consistent theory of crack growth controlled by a cumulative damage variable d(t) dependent on stress history, in the quasistatic regime where the sound wave velocity is taken as infinite. Depending upon the damage exponent m, which controls the rate of damage dd/dt~sigma(m) as a function of local st…
The interactions of polyaniline coatings on low-density polyethylene films with aqueous viologen solutions were investigated. The coatings were characterized by X-ray photoelectron spectroscopy, electron spin spectroscopy, UV−visible absorption spectroscopy and sheet resistance measurements. The results showed that th…
Abstract Dynamic viscoelastic measurements were made for storage ( E ′) and loss ( E ″) tensile moduli of water‐absorbable polymers such as nylon‐6, nylon‐66, poly(vinyl alcohol), ethylene–vinyl alcohol copolymers, and regenerated cellulose under the control of stepwise scanned relative humidity at constant temperatur…
Hydrostatic pressure is used to modulate the intermolecular interactions in the conjugated oligophenyl, para -hexaphenyl. These interactions affect the structural properties and also cause changes in the molecular geometry that directly alter the electronic properties. We use Raman spectroscopy to investigate the natu…
The surface modification by chemical or physical adsorption of a polyelectrolyte (polyallylamine, PAH) was established using hydrolyzed polycarbonate (PC) and poly(ethylene terephthalate) (PET) thick and thin films. Contact angle data indicated changes in the hydrophilicity of PET film surfaces in terms of the chemica…
Laser-ablated palladium, platinum, silver, and gold atoms react with molecular oxygen in excess neon during condensation at 4 K. Reaction products, M-(η 2 -OO), M-(η 2 -OO) 2 (M = Pd, Pt), PtO, PtO 2, AuO 2, M-(η 1 -OO) (M = Ag, Au), and anions Ag-(η 1 -OO) -, Au-(η 1 -OO) 2 -, are identified from isotopic shifts and…
An analysis of the mechanical properties and a detailed structural study of samples of syndiotactic polypropylene (sPP) are presented in order to clarify the origin of the elastic behavior of sPP. Samples of sPP having different stereoregularity and showing different polymorphic behavior have been analyzed. The presen…
Crystallization and melting of n -paraffins of chain lengths up to C 60 H 122 can be largely reversible, and practically no supercooling is seen in differential scanning calorimetry (DSC) and temperature-modulated DSC (TMDSC). To find the changes with chain length for this effect, polyethylene fractions of oligomers o…
The drug substance hydroxytriendione has been found to exist in three modifications, which are equal in their pharmaceutical profile and are equally stable. Thus, Form II, the polymorph thermodynamically stable at room temperature, was chosen as the solid-state form for the active pharmaceutical ingredient. Spontaneou…
A neutron diffraction study of the non-linear optical (NLO) material 4-nitro-4'-methylbenzylidene aniline (NMBA) is presented. NMBA exhibits a large macroscopic second-order NLO susceptibility, chi((2)), and this study shows that hydrogen bonding is, in part, responsible for this. No hydrogen bonding was reported in t…