Advanced Composite Materials Products and Manufacturers
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Materials Literature
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Electrical and optical properties of reactively evaporated indium tin oxide (ITO) films-dependence on substrate temperature and tin concentration
The dependence of the electrical and optical properties of reactively evaporated indium tin oxide films on substrate temperature and tin concentration has been studied. Films of resistivity as low as 3*10 -4 Omega cm and high visible transparency of about 91% have been obtained at higher deposition temperatures ( appr…
Method for determining the optical constants of a thin film on a transparent substrate
A method has been proposed for exact calculation of the optical parameters n and k of a thin film on a transparent substrate by simultaneously solving the equations for two of the envelopes of the transmission and reflection spectra. The singularity of the solution and the convergency area are proved, and the influenc…
Compatibility of epoxidized natural rubber with thermoplastic and thermosetting resins
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…
Morphology of HDPE/(PEC/PS) blends modified with SEBS copolymers
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…
Front Matter: Volume 10305
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…
Water sorption kinetics in poly(aryl ether ether ketone)
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…
Crosslinking of polypropylene–polyethylene blends by peroxide and the effect of pentaerythritol tetrallyl ether
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…
Kinetic and ultraviolet spectroscopic studies of active-site mutants of .DELTA.5-3-ketosteroid isomerase
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…
Synthesis, photochemistry, and biological activity of a caged photolabile acetylcholine receptor ligand
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…
LEED intensity analysis of the clean W(100) c(2 2) surface reconstruction
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…
Correlation of the optical gaps and Raman spectra of hydrogenated amorphous carbon films
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…
The brittle-ductile transition in silicon. II. Interpretation
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…
Addition polyimides. II. Synthesis and characterization of bisitaconimide prepolymers
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…
Characterization of poly(3,3‐bisethoxymethyl oxetane) and poly(3,3‐bisazidomethyl oxetane) and their block copolymers
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…
Preparation of barium titanate–polypyrrole compositions and their electrical properties
Their Electrical
Immobilization of poly(ethylene oxide) on poly(ethylene terephthalate) using a plasma polymerization process
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…
Shear breakage of nylon membrane microcapsules in a turbine reactor
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…
Thermal degradation of cellulose‐containing composites during processing
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…
Elastic Anomaly and Phase Transition of BaTiO3
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…