Materials Literature
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Abstract In this work a comparative study on the impact and tensile properties of polyester/sisal fiber reinforced composites was undertaken. The polyester matrix was used bare and modified with: (1) a silane coupling agent; (2) a flame retardant system; and (3) a blend of the silane agent and the flame retardant syst…
Morphological effects in luminescence properties of a representative semiconducting polymer, poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV), has recently attracted much attention. Previous studies indicated that short-term heat treatment of solution-cast MEH-PPV films may result in the formation…
$\ensuremath{\kappa}\text{\ensuremath{-}}{(\mathrm{BEDT}\text{\ensuremath{-}}\mathrm{TTF})}_{2}X$ salts exhibit a wide range of properties from superconductivity to magnetic ordering. The phase diagram of this system has been understood as the competition between anti-ferromagnetic insulating behavior and superconduct…
Abstract FT‐IR spectroscopy has been employed to study compatibility, melting, and crystallization of the polyethylene adipate (PEA)/cholesteryl palmitate (CP) blends. The changes in FT‐IR spectra were followed by controlled rate of heating and cooling. The bands corresponding to the crystalline structure have been as…
Mn−Al and M−Mn−Al (M = Mg, Zn, Ni, Pb, Cr) hydrotalcite-like compounds (HTlcs) were synthesized by a coprecipitation method. The hydrogenation of methyl benzoate to benzaldehyde over the calcined HTlcs was investigated. Mn 2 Al 1 catalyst calcined in N 2 gives a better performance than a conventional 10% Mn/γ-Al 2 O 3…
Antimony trioxide, lead chromate, and copper antimonite are suitable oxidants for silicon metal in time-delay compositions ignitable by shock tubing. Measured burn rates for these systems vary from 6 to 30 mm/s. Lead chromate mixtures burned fastest under comparable conditions. The latter two systems show a bimodal bu…
Abstract Meltblowing is a most versatile and cost‐effective process commercially available worldwide to produce microfiber nonwovens directly from thermoplastic resins. The new bicomponent (bico) meltblown technology opens a great possibility to make even finer microfibers by subsequently fiber splitting. Water‐disper…
We present tight-binding molecular dynamics simulations of the structural modifications that result from the ``thermal spike'' that occurs during the passage of a heavy fast ion through a thin diamond or amorphous carbon layer, and the subsequent regrowth upon cooling. The thermal spike and cooling down are simulated…
Abstract The devulcanization of resin‐cured unfilled butyl rubber with a grooved‐barrel ultrasonic reactor under various processing conditions was carried out. The experiments indicated that, because of the lower unsaturation and good thermal stability of butyl rubber, its devulcanization could be successfully accompl…
Unsaturated polyesters are synthesized in the laboratory by the condensation of saturated and unsaturated anhydrides with glycols. The condensate obtained is mixed with styrene monomer to get an unsaturated polyester resin formulation. The properties of the polyester resin synthesized are affected by the synthesis par…
The second harmonic and electro-optical responses for the water molecule in its liquid state are theoretically revised. The continuum, semicontinuum, and supermolecular solvation models are employed using quadratic response theory at the Hartree−Fock level, either in the equilibrium or nonequilibrium implementation. T…
Crowding effects relevant to the phase stability of binary mixtures of rod-like and spherical particles are investigated by means of Monte Carlo simulations in the isobaric NPT ensemble. The two types of particles are represented, respectively, by freely rotating hard spherocylinders of a moderate aspect ratio (L/sigm…
Under sufficiently crowded conditions, elongated particles spontaneously align along a common axis and separate from particles with dissimilar packing parameters. Clarifying the relevance of these entropy-driven phenomena to intact cells has required the development of theoretical approaches that tractably take into a…
Zn(II) binding by the dipyridine-containing macrocycles L1-L3 has been analyzed by means of potentiometric measurements in aqueous solutions. These ligands contain one (L1, L2) or two (L3) 2,2'-dipyridine units as an integral part of a polyamine macrocyclic framework having different dimensions and numbers of nitrogen…
This paper describes an approach to adhere retinal cells on micropatterned polyelectrolyte multilayer (PEM) lines adsorbed on poly(dimethylsiloxane) (PDMS) surfaces using microfluidic networks. PEMs were patterned on flat, oxidized PDMS surfaces by sequentially flowing polyions through a microchannel network that was…
Abstract The supermolecular structures and structural relaxation of the waste rubber–urethane composites are discussed on the basis of results of calorimetric measurements and mechanical spectroscopy. The results give a broader understanding of the relationship between processing history and morphology in the resultan…
Abstract Three epoxy compositions have been developed by using polyether amine hardeners having varying chain lengths of polyethers. Unlike normal epoxies, the compositions show low glass transition temperatures (0–45°C). Dynamic mechanical analysis and time–temperature superposition of the isotherms indicate that the…
We have measured the adiabatic second order elastic constants of two $\mathrm{Ni}\text{\ensuremath{-}}\mathrm{Mn}\text{\ensuremath{-}}\mathrm{Ga}$ magnetic shape memory crystals with different martensitic transition temperatures, using ultrasonic methods. The temperature dependence of the elastic constants has been fo…
The glide of an edge dislocation, in a random solid solution, $\mathrm{Ni}$ (1 to 8 at % $\mathrm{Al}$), is simulated by molecular dynamics (MD). An embedded atom method potential has been optimized to reproduce the relevant properties of the face centered cubic solid solution and of the $\mathrm{L}{1}_{2}$ ${\mathrm{…
Functionalization of carbon nanotubes (CNTs) is important to increase their solubility and reactivity. This paper investigates possible ways of functionalizing CNTs using the methoxy radical and the secondary butyl anion as initiators and their reactions with ethylene and epoxide, leading to polyethylene- and polyepox…