Materials Literature
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Polarization-dependent low-frequency off-resonant Raman scattering has been studied from various commercially available filter glass samples, which contain ${\mathrm{CdS}}_{x}{\mathrm{Se}}_{1\ensuremath{-}x}$ nanoparticles embedded in a glass matrix. In order to distinguish the confined acoustic phonons from the glass…
The reaction of ZnO and tetramethylthiuram disulfide (TMTD) was reinvestigated in detail. Under conditions where evaporation of volatiles is possible, TMTD and an excess of ZnO are found to produce bis(dimethyldithiocarbamato)zinc(II) (ZDMC) in limiting amounts close to 60 mol %, irrespective of the ratio between ZnO…
The title complex, zinc mercury tetrathiocyanate, [ZnHg(SCN) 4 ] n , consists of slightly flattened ZnN 4 and HgS 4 tetrahedra linked by -S=C=N- bridges to form infinite three-dimensional -Hg-S=C=N-Zn- networks. This structural feature contributes to the physical and chemical stability and the non-linear optical prope…
Soil burial degradation behavior of miscible blend systems of poly(vinyl alcohol) (PVA)/partially deacetylated chitin (1), PVA/chitin-graft-poly(2-methyl-2-oxazoline) (2), and PVA/chitin-graft-poly(2-ethyl-2-oxazoline) (3) was investigated in comparison with the case of a pure PVA film. The degradation of the blend fi…
This article describes the synthesis and characterization of a polymer-bound nonhalogen fire retardant (NHFR). The reactive fire retardant used in this study is 2-carboxyethyl(phenylphosphinic) acid (CEPP); the polymer is poly(ethylene terephthalate) (PET). Fire-retardant and other modifiers of polymer properties must…
Different approaches to control the molecular weight of hyperbranched poly(siloxysilane) have been explored. Because the intramolecular hydrosilylation competitively consumes the vinyl groups of the monomer and other oligomeric intermediates, the conventional single-batch bulk process generally affords polymer with a…
The mechanisms by which macromolecular impurities degrade the diffraction properties of protein crystals have been investigated using X-ray topography, high-resolution diffraction line shape measurements, crystallographic data collection, chemical analysis, and two-photon excitation fluorescence microscopy. Hen egg-wh…
Through time-dependent gas transport properties, we have investigated the physical aging process of amorphous glassy polymer films made from a polynorbornene. By combining the concepts of free volume and the kinetic theory of glass stabilization, it was found that the time dependence of the gas permeability could be r…
A band structure calculation based on the X-ray structure analysis reveals that pressure raises quasi one-dimensionality of the Fermi surface of the title compound. A 2 k F lattice modulation is observed with a wave vector q 3 ′ =(2/3 0 0.29) at 10.7 kbar and room temperature. This is the first observation of pressure…
The growth at room temperature of Pd on an atomically flat MgO(001) surface has been investigated by grazing incidence x-ray scattering. The structure and morphology of deposits in the range 0.2 to 183 monolayers (ML) were analyzed in situ, in ultrahigh vacuum (UHV). The growth proceeds by nucleation, growth, and coal…
In a previous article, the processing of nanocomposite materials of plasticized poly(vinyl chloride) (pPVC) reinforced by cellulose crystalline whiskers was presented as well as preliminary dynamic mechanical measurements. The purpose of the present work is to evaluate the possible change of molecular dynamic of poly(…
Localized electronic states corresponding to \ensuremath{\pi} electrons in hydrogenated amorphous carbon have been investigated using photoluminescence (PL) and optical-absorption spectroscopies. Carbon films contain \ensuremath{\pi}-bonded ``grains'' with different configurations which spatially confine photogenerate…
Permanganic reagents, developed for revealing semicrystalline morphology in olefin polymers under the electron microscope, have been modified by changing the water content to give the best resolution of detail in different polyethylene specimens. An optimum reagent is chosen to characterize a special feature of polyet…
In the present computational study, we focus on graphene ribbons with zigzag edge atoms with their unsaturated bonds either dangling or terminated by various adsorbates (H, O, or Cs). Using this system as a test case, we discuss the two important contributions to the work function---the first one being an anisotropic…
Ordered poly(ethylene)-poly(vinylcyclohexane) (PE-PVCH) block copolymers are employed to study the crystallization of tethered PE in confined geometries. The high Tg of the PVCH component of these materials forces PE chains to crystallize in well-defined geometries dictated by the mesophase structure of the block copo…
The structure and morphology of Ag deposits grown at room temperature on high-quality MgO(001) surfaces have been investigated in situ, from 0.2 to 300 equivalent monolayers (ML) of Ag deposited. Surface x-ray diffraction and grazing incidence small angle x-ray scattering parallel and perpendicular to the surface were…
The equilibrium phase behavior of water (nonsolvent)-DMF (solvent)-PVDF system at 25°C was investigated via both theoretical and experimental approaches. Using binary interaction parameters, χij, obtained previously, the theoretical phase boundaries were computed and were found to match closely the measured binodal an…
Recent measurements have shown that the inorganic clathrate Sr8Ga16Ge30 has good thermoelectric properties. This discovery has caused intense experimental activity to synthesize and test other compounds in this class. It has been conjectured that clathrates may be good thermoelectrics if they satisfy several condition…
Steam-exploded fibers from Yellow poplar (Liriodendron tulipifera) wood were assessed in terms of their thermal stability characteristics, their impact on torque during melt processing of a thermoplastic cellulose ester (plasticized CAB) matrix, their fiber–matrix adhesion and dispersion in composites, and their mecha…
A series of shape-memorized crosslinked ester-type polyurethanes (PUs), based on different compositions of 4,4′-diphenyl methane diisocyanate (MDI), poly(butylene adipate) glycol (PBAG) with different molecular weight (MW) and trimethylol propane (TMP), were synthesized. The morphology of samples was investigated by u…