Materials Literature
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The fabrication of improved ceramic-matrix composites will require a better understanding of processing variables and how they control the development of the composite microstructure. Noninvasive, high-resolution methods of x-ray tomography have been used to measure the growth of silicon carbide in a woven Nicalon-fib…
Rubber-toughened poly(methyl methacrylate) (RTPMMA) materials were prepared by blending PMMA with multiple-phase toughening particles with radially alternating rubbery and glassy layers. The effects of particle morphology and rubbery-phase volume fraction on the tensile and fracture properties were evaluated. The prin…
The production of H 2 and CO by catalytic partial oxidation of CH 4 in air and O 2 at atmospheric pressure has been examined over Pt- and Rh-coated monoliths at residence times of less than 10 -2 sec, with a Rh-coated foam monolith giving H 2 and CO selectivities as high as 0.90 and 0.96 respectively. Studies of sever…
Abstract Reactive extrusion is the term used to denote a plastics processing method in which an extruder is used as a reactor for the continuous synthesis and modification of polymers. This paper describes the manufacture of polystyrene and styrene‐isoprene copolymers by a reactive extrusion process: anionic “living”…
A toughened thermoset generally contains elastic or thermoplastic domains dispersed in discrete form throughout the matrix resin to increase the resistance to crack-growth initiation. Fracture behavior is governed by characteristics of viscoelasticity, shear yielding, and dilatational deformation involving cavitation.…
The adsorption and reaction of CO, CO 2, NO 2, H 2 O, CH 3 OH, and C 2 H 4 were studied on clean and oxygen-precovered Au(111) surfaces. High coverages of oxygen adatoms, Θ O, up to one monolayer were formed under clean, UHV conditions by exposure of Au(111) to ozone. Neither CO nor CO 2 adsorbed on clean or oxygen-pr…
The effects of oxygen co-doping in ZnS:TmF3 and ZnS:Tm, Li thin-film electroluminescent devices are reported. Active layers are deposited in oxygen atmosphere at substrate temperatures of 200 and 300 °C. It is found that by oxygen codoping the luminance of ZnS:TmF3 and ZnS:Tm, Li devices increases, and that this pheno…
A phenomenological description of the dynamical correlations in a fluid confined between two parallel solid walls, using a generalization of Onsager's theory of fluctuations, is presented. Besides the bulk viscosity, this description involves parameters characterizing the boundary conditions. Correlations functions ob…
Here we study the interplay between wetting and phase separation for a nearly symmetric binary mixture confined in a one-dimensional (1D) or a two-dimensional (2D) capillary. It is found that near the symmetric composition, the hydrodynamics unique to bicontinuous phase separation plays a crucial role in the wetting d…
The structural properties and the phase transition between the B1 (rock salt) and B2 (CsCl) phases of NaCl have been investigated at an ab initio level. Total energy curves, obtained with periodic Hartree-Fock (HF) calculations, have been corrected a posteriori by integrating the HF charge density according to the cor…
Coherent intermediate scattering functions are measured by dynamic light scattering for several wave vectors around the structure factor peak on metastable colloidal fluids and glasses of hard spherical particles. The results are quantitatively described by a combination of the \ensuremath{\alpha} and \ensuremath{\bet…
Long-lived phosphorescence and thermoluminescence (TL) from UV-irradiated SrO powders under high vacuum are observed at low temperature. Phosphorescence decays following a t -1 law below 160 K in the time range 10-103 s. The emission spectra of phosphorescence and TL have a peak at 2.7 eV. The luminescence is quenched…
Abstract The application of photosensitive polyimides in electrical and optical interconnection technology is discussed. Critical properties of two photosensitive polyimide formulations with significantly different structural chemistries have been compared. Polyamic ester based formulations such as Selectilux® HTR3 sh…
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Abstract The character of mixing was interpreted through the energy consumption. It was correlated with the quality of mixing which is described by two parameters: average degree of dispersion and coefficient of heterogeneity. Experiments were carried out for polyethylene-based compounds with various fillers and typic…
Bulk, semiconducting GaxTe100-x (17 ≤ x ≤ 25) glasses are prepared by the meltingh quenching method and electrical resistivity measurements are carried out at high pressures up to 8 GPa and low temperatures down to 77 K in a Bridgman anvil system. It is found that all the GaxTe100-x, glasses exhibit metallization unde…
Abstract A new family of positive photosensitive polyimide (PPI) systems composed of solvent soluble polyimides (Pls) with cyclobutane (CBDA) structures and diazonaphthoquinone compounds (DNQ) has been prepared. Heat and catalytic imidizations were carried out to obtain CBDA Pls; the former was better than the latter…
Abstract An introduction to nonlinear optics (NLO) and the major challenges in the field of NLO‐properties of polymeric materials, is given in this paper. Methods for the investigation of nonlinear optical properties of [4‐(2‐methacryloxyethyl)methylamino]‐4′‐cyanoazobenzene copolymers with methyl methacrylate (MMA) a…
An inherently fringe stable interferometer, with uniform recording-plane exposure, produces transmission gratings with uniformly high efficiency. The surface-relief structures recorded in positive photoresist are ideal for their transfer into specialized candidate materials. These structures have many applications in…
The effects of the thickness, uniaxial anisotropy field, electrical resistivity and addition of other elements on the frequency dependence of permeability in Fe-Zr-N films were investigated. Film thicknesses were varied up to 8 μm. The purpose of this study was to identify the main origin of the high-frequency loss in…