Materials Literature
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Abstract Preliminary investigations to study the feasibility of using polystyrene grafted with acrylic acid to blend polystyrene (PS) and nylon 6,6 (N66) have been done. The graft copolymer (PS‐g‐AA) was synthesized by reacting polystyrene with acrylic acid in the presence of a free radical initiator using the solid p…
Highly oriented strontium barium niobate (SBN) thin films have been grown on MgO{100} substrates by pulsed-laser deposition. The films have been characterized by X-ray diffraction (XRD), scanning electron microscopy and atomic force microscopy. XRD θ–2θ scans indicate single-phase crystalline SBN layers with the {100}…
This paper presents a new foaming technology using supercritical carbon dioxide as a blowing agent to obtain large volume expansion of biodegradable polyester foams of over forty-fold. The basic approach for the promotion of a large volume expansion ratio with carbon dioxide was to prevent cell coalescence by using a…
Abstract Fourier Transform Raman spectroscopy is employed to study the mechanism of reversion and the influence of the antireversion agent, 1,3 bis(citraconimidomethyl)benzene (BCI-MX) in squalene as well as in low molecular weight synthetic polyisoprene. The formation of non-sulfidic main chain modifications, such as…
A lamellar ABA triblock copolymer brought to equilibrium in the presence of a B-compatible solvent generally swells or transforms into an A-dispersed (cylindrical or micellar) morphology, depending on solvent content. If the A blocks of the copolymer are glassy, they serve as physical cross-links and stabilize a gel n…
Ytterbium–yttrium mixed oxides, which are potential emitter materials for thermophotovoltaic energy converters, were prepared using two different synthesis methods. The results of a characterization using Raman spectroscopy and x-ray powder diffraction (XRD) are presented. The purpose of this study was to confirm whet…
The structural parameters of needle punched nonwoven composites have been examined using image analysis system. Fourteen plies of carded webs of E Glass fiber were stacked and needle punched at different punching densities of 15, 30, 45, 60, and 90 penetrations per square centimeter. The needle punched webs were forme…
In the quest to improve the thermooxidative aging of the poly(vinyl chloride)/epoxidized natural rubber (PVC/ENR) blend, nitrile rubber (NBR) was incorporated into the blend to yield a ternary blend of PVC/ENR/NBR. A Brabender Plasticorder with a mixing attachment was used to perform the melt mixing at 150°C and 50 rp…
The Gibbs phase rule relates the number of degrees of freedom to the number of components and number of phases in a system at thermodynamic equilibrium. In determining the number of components, one must determine the number of independent reactions and the number of stoichiometric constraints. Textbooks focus on the p…
A design of experiments was employed to optimize the conditions of synthesis in order to electrogenerate thick polypyrrole films suitable for application as a cathode in polymeric batteries or supercapacitors. The influence of five main variables: potential of polymerization, generation time, monomer concentration, el…
Ferroelectric domain structures of epitaxial BaBi 4 Ti 4 O 15 (BBiT) thin films with different orientations have been imaged for the first time at the nanometer scale. Using the piezoresponse mode of scanning force microscopy it was demonstrated that the spontaneous polarization of BBiT has no component along the c -a…
We suggest that the 550-nm “yellow” emission in CdWO4 is due to Bi3+ ions substituting for Cd2+ ions. The absorption band corresponding to this emission has a peak near 350 nm. This yellow emission was only observed in crystals that contained bismuth impurities. Electron paramagnetic resonace has identified two new ce…
Critical flow intensities expressed in terms of critical wall shear stresses for initiation of flow induced localized corrosion (FILC) at carbon steel under CO{sub 2} corrosion conditions (1 M NaCl, 5 bar CO{sub 2}, 80 C) were evaluated using the submerged jet impingement method. Flow independent pitting facilitates F…
The transmittance and reflectance of superconductive YBa2Cu307-δ (YBCO) thin films deposited on Si substrates have been measured in the far-infrared frequency region from 10 to 100 cm−1 (wavelength from 1000 to 100 μm) at temperatures between 10 and 300 K. The effects of interference, optical resonance, and antireflec…
Lactoferrin is an important member of the transferrin family. A characteristic property of transferrins is their ability to bind very tightly (K(app) approximately/= 10(20)) but reversibly two Fe(3+) ions. The structural consequences of binding a metal other than Fe(3+) have been examined by crystallographic analysis…
ABSTRACT Compressive properties of composite gels consisting of 13% whey protein isolate (WPI) and 10% to 30% selected milkfat fractions were investigated at different temperatures. Compressive properties of gels were significantly affected by melting properties of the filler. Maximum compressive strength of composite…
Enzyme I of the bacterial phosphoenolpyruvate:sugar phosphotransferase system can be phosphorylated by PEP on an active-site histidine residue, localized to a cleft between an alpha-helical domain and an alpha/beta domain on the amino terminal half of the protein. The phosphoryl group on the active-site histidine can…
Single crystals of Al 2 O 3 were implanted at a temperature of 25°C with magnesium ions that were accelerated at 200 keV and then annealed in oxygen gas for 15 h at 1500°C. The microstructure and composition in the implanted region were examined using analytical electron microscopy techniques, with an emphasis on iden…
Abstract Physical blends of nylon 6 (or nylon 66) homopolymer with random copolymers of nylon 6/nylon 66 or of nylon 6/nylon 12 were melt extruded into films and characterized by Differential Scanning Calorimetry (DSC) and X‐ray Diffraction (XRD) techniques. The films containing up to 50–65% of the copolymer exhibited…
Certain aspects of copper tube failure in drinking water systems are inconsistent with the “membrane cell theory” of copper pit propagation, which postulates that cathodic reactions occur immediately above the pit tubercle. To examine the basis for this theory, classic experiments of Lucey were revisited and alternati…