Materials Literature
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We have developed a novel computational scheme that allows direct numerical simulation of polymer-colloid mixtures at constant osmotic pressure. Using this technique, we have studied the entropic attraction that is caused by ideal polymers dissolved in a simple (hard-sphere) colloidal dispersion. In particular, we stu…
Abstract Weather‐induced degradation of polymer properties is caused by all the factors of weather, which include solar radiation, temperature, humidity, wind, rain, environmental pollutants, thermal cycling (cold night and hot days), and sand abrasion. Linear low‐density polyethylene (LLDPE) is exposed to natural wea…
Abstract The ambient temperature structure–property orientation behavior in two different polyureaurethane polymers (one cross‐linked and one linear) was measured by using infrared dichroism along with mechanical response. Thin films (plaques) thermally compression‐molded from TDI‐polypropylene (PO) flexible water‐blo…
Abstract The Avrami equation has been widely used to describe polymer crystallization kinetics. However, the equation accurately fits experimental data only during the early stages of the crystallization process, and is unsuccessful in describing the entire process because it does not take into account secondary cryst…
Abstract Epoxy–imide resins have been obtained through the reaction of Araldite GY 250 (diglycidylether of bisphenol‐A and epichlorohydrin; difunctional) and Araldite EPN 1138 (Novolac‐epoxy resin; polyfunctional) with bis(carboxyphthalimide)s derived from 4,4′‐diaminodiphenylsulfone, 3,3′‐diaminodiphenylsulfone, 4,4′…
Abstract Structural characteristics of the silk fibroin fiber‐modified with epoxide treatment were elucidated by refractive index measurement, differential scanning calorimetry, and thermomechanical analysis and on the basis of strength–elongation measurements. The four epoxides used were glycidol (G), ethylene glycol…
By computer simulation of the electron spin resonance spectra of even and odd isotopes of Mo 5+ in WO 3 -BaO-P 2 O 5 glasses of various compositions, the characteristics of the distributions of g values and hyperfine structure parameters have been deduced. Using these data, the characteristics of the distributions of…
By measuring the complex dielectric susceptibility over 15 decades in frequency we compare the \ensuremath{\alpha} relaxation in low-molecular-weight glass-forming liquids and polymers. To describe the scaling behavior of the \ensuremath{\alpha} relaxation, a minimal set of four parameters is necessary, the mean relax…
Two modified forms of carbon were quenched by a rapid-cooling technique from graphite sheets shock-compressed to 65 gigapascals and 3700 K. One form, ;;n-diamond," which was obtained from the most rapidly cooled part, has a crystal structure close to that of cubic diamond. The other form, found in the relatively slow-…
Absorption and luminescence spectra of phenanthrene have been investigated under pressures up to 2.4 GPa, using a diamond anvil cell. Free-exciton luminescence which is observable at ambient pressure is replaced by self-trapped-exciton luminescence at pressures higher than 1.8 GPa. From this fact it is suggested that…
[CoNd 2 (μ-C 2 H 3 O 2 ) 8 (H 2 O) 10 ] cristallise dans P1 avec a=8,243, b=10,368, c=11,497 A, α=111,64, β=107,94, γ=93,45 o , Z=1; affinement jusqu'a R=0,024. Les chaines sont construites de prismes rhomboedriques deformes [NdO 7 (OH 2 ) 2 ], chapeautes sur 3 faces, et d'octaedres CoO 6 presque reguliers
Elastic-neutron-scattering experiments, performed on a single crystal of ${\mathrm{Tl}}_{0.3}$${\mathrm{MoO}}_{3}$, show the formation of a periodic distortion below the metal-semiconductor transition at about 170 K. Similar to the isostructural blue bronzes ${\mathrm{K}}_{0.3}$${\mathrm{MoO}}_{3}$ and ${\mathrm{Rb}}_…
The kinetics of the amorphous-to-tetragonal transformation has been studied in sol-gel-derived thin films of zirconia deposited on alumina substrates. A rapid-thermal-annealing system was used which allowed good control of processing parameters such as temperature and heating rates. The effect of these two parameters…
Several physical properties of thin plasma-polymerized films have been measured using a new fiber-optic-based technique. Films of plasma-polymerized tetrafluoroethylene (PPTFE) deposited on the end of an optical fiber form an optical cavity, the reflectivity of which is very sensitive to the film thickness. The fiber…
Interest continues to grow in polymers that have inherent biological activity or polymers which are covalently attached to well known drugs. This paper provides an introduction to these types of materials and a general review of the different types of polymeric drugs, polymeric drug conjugates, polymeric prodrugs, and…
We have examined the propagation of acoustic phonons in silicon on the basis of two lattice-dynamics models: a bond-charge model and an effective-force-constant model consisting of only short-range forces. Phonon propagation is governed predominantly by phonon focusing due to elastic anisotropy and elastic scattering…
Films with a composition PbZr0.53Ti0.47O3 were prepared on different platinum bottom electrodes using a spin-coating process followed by metalorganic decomposition. The film morphology and structure were characterized by scanning electron microscopy and x-ray diffraction analysis. The morphology was strongly influence…
We have calculated total and binding energies of zinc-blende-structure boron nitride. Starting from a self-consistent-field ground-state calculation within a finite basis of Gaussian orbitals centered at the different atoms, the electron correlations were treated by applying the local ansatz. The electronic correlatio…
Theoretical modeling of surface-plasmon-enhanced polarization conversion from a diffraction grating is developed. The theory compares very favorably with data. From further modeling it is found that the transverse-magnetic mode to transverse-electric mode available from a metallized grating may approach 100% in approp…
We have performed ab initio calculations of the crystal structure and electronic structure of ${\mathrm{B}}_{6}$O using an expansion in over 11 700 plane waves. The crystal structure is compared with recent x-ray data; contour plots show the two oxygen atoms in the unit cell do not bond to each other, and the heat of…