Materials Literature
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Abstract The compatibility behavior of epoxidized natural rubber (ENR) at two different degrees of epoxidation with hydroxyl‐containing polymeric resins was investigated. These included Novolac and Resole resins, the cured epoxy of bisphenol A (CER), and phenoxy. For each system, compositions covering the complete ran…
Abstract In this study, immiscible blends of HDPE and an amorphous glassy polymer were compatibilized with styrene‐hydrogenated butadiene block copolymers. The glassy phase consisted of either pure PS or a miscible blend of PS and polyether copolymer (PEC); PEC is similar to poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO…
The concept of the Institutes for Advanced Optical Technologies developed out of SPIE's desire to foster increased interaction and collaboration among researchers working in emerging optical technologies. The Institutes provide a forum for experts in these areas to analyze and document the state of the art and to poin…
Abstract The kinetics of diffusion of water from different activity vapors and liquid phase have been investigated in glassy amorphous poly(aryl ether ether ketcne) (PEEK) films at the temperature of 60°C and in glassy semicrystalline PEEK sheets at different temperatures, respectively. In the case of the amorphous PE…
Abstract Crosslinking of polypropylene–polyethylene (PP‐PE) blends involving 10, 20, 30, 40, 50, 60, 70, 80, and 90% of PP with dicumylperoxide (DCP) or tert‐butyl perbenzoate (TBPB) and in the presence of coagent pentaerythritol tetrallyl ether (PETA) was investigated at 180°C. It was found that at lower concentratio…
delta 5-3-Ketosteroid isomerase (EC 5.3.3.1) of Pseudomonas testosteroni promotes the highly efficient isomerization of delta 5-3-ketosteroids to delta 4-3-ketosteroids by means of a direct and stereospecific transfer of the 4 beta-proton to the 6 beta-position, via an enolic intermediate. An acidic residue responsibl…
A biologically inert photolabile precursor of carbamoylcholine has been synthesized; it is photolyzed to carbamoylcholine, a well-characterized acetylcholine analogue, with a half-time of 40 microseconds at pH 7.0 and a quantum yield of 0.8. The compound, N-(alpha-carboxy-2-nitrobenzyl)carbamoylcholine, was synthesize…
A LEED structure analysis is performed for the W(100) c(2*2) surface reconstruction. Models with pure vertical displacements of the surface atoms can be clearly ruled out while others with predominant lateral displacements in the (11) and (01) directions result in a very good agreement with the experimental curves. Ho…
The Raman and infrared absorption spectra, optical gaps, and electron spin densities of amorphous carbon films deposited from hydrocarbon plasmas have been systematically studied as a function of deposition conditions and Raman probe wavelength. Although all other probes are consistent with a monotonic increase in int…
Abstract A dynamic crack tip shielding model has been developed to describe the brittle-ductile transition (BDT) of precracked crystals in constant strain-rate tests. Dislocations are emitted from a discrete number of sources at or near the crack tip. At the BDT the dislocations are emitted and move sufficiently rapid…
Abstract N , N ′‐bis(3,3′‐itaconimidophenyl) sulfone has been synthesized by reacting itaconic anhydride with 3,3′‐diamino diphenyl sulfone. The bisitaconimides and the intermediates were characterized by chemical analysis, IR, NMR, TG, and GPC. The degree of polymerization (DP) of the prepolymers of the bisitaconimid…
Abstract The homopolymers, poly(3,3‐bisethoxymethyl oxetane) (polyBEMO), poly(3,3‐bisazidomethyl oxetane) (polyBAMO), and triblock copolymers based on these homopolymers and a statistical copolymer center block composed of BAMO and 3‐azidomethyl‐3‐methyl oxetane AMMO were synthesized and characterized by differential…
Their Electrical
Abstract Poly(ethylene oxide) (PEO) has been covalently immobilized on poly(ethylene terephthalate) (PET) films using a radio frequency glow discharge polymer deposition process, followed by chemical coupling. Amino or hydroxyl groups were introduced onto the surface of the PET by exposing the films to allylamine and…
The breakage of nylon membrane microcapsules is proposed as a new method to study and quantify shear effects in biological systems. A critique of this method shows that a narrower particle size distribution may be an important improvement in the breakage study as well as breakage control in many bioreactor and biotech…
Abstract The strength properties of composites made of untreated cellulose fibers and linear low density polyethylene were investigated as a function of processing parameters. Studies have shown that the strength properties of composites increase with processing time and temperature. The increase in strength is accomp…
The acoustic-phonon velocities of a single crystal of BaTi${\mathrm{O}}_{3}$ have been measured as a function of pressure up to 8 GPa, including the transition pressure ${p}_{c}=2.35$ GPa, by means of Brillouin scattering technique. Only one elastic eigenmode shows an anomalous decrease on approaching ${p}_{c}$ and th…
We present photoemission spectra from the $3p$ level of Cu(100) obtained in coincidence with the ${M}_{3}\mathrm{VV}$ Auger line. The $3p$ level is narrowed from its 2.2-eV core-lifetime-broadened width to 1.0 eV, representing the intrinsic width of the $^{1}G$ Auger final state. The core line changes its energy withi…
When a bead heap is submitted to low-frequency ($\frac{\ensuremath{\omega}}{2\ensuremath{\pi}}=10\ensuremath{-}1000$ Hz) vertical vibrations at a large enough amplitude $a$, its horizontal free surface becomes unstable and a stationary state is reached. This one is characterized firstly by a free surface which is incl…
The effect of industrial beating on tensile strength properties has been compared with laboratory beating and the differences observed have been explained in terms of fibre properties. Tensile strength development is less pronounced for industrial beating than for laboratory PFI-mill beating. Beating in the laboratory…