Materials Literature
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In this study, a variety of additives have been evaluated as potential fire retardants for polyureas with cone calorimetry being the method of evaluation. The additives that have been evaluated include minerals (alumina trihydrate), bromine-, nitrogen-, and phosphorus-based fire retardants. The major criteria for eval…
Solutions composed of alpha-cyclodextrin (alpha-CD), water, and various methylpyridines, in particular, 4-methylpyridine (4MP), undergo reversible liquid-solid transitions upon heating, the crystalline solid phases undergoing further phase transformations at higher temperatures. This unusual behavior has been characte…
I found this old nail (Figure 1.1) - some 135 mm long - whilst poking about among the debris from restoration work in the medieval hill-top village of San Gimignano, Tuscany. In the Middle Ages, such nails were made by hand, a blacksmith using a hammer and an anvil, in this case containing a suitable slot so that he c…
The Langmuir and Langmuir-Blodgett (LB) techniques have been applied in a novel approach to build structurally well-ordered, oriented, and organized assemblies of water-soluble single-wall carbon nanotubes (ws-SWCNTs) at the air/water and air/solid interfaces. The SWCNTs were rendered hydrophilic by complexing them wi…
Chiral microporous lanthanide silicates Na3[(Y,Ln)Si3O9]⋅3 H2O (1; Ln=Eu, Tb, Er, Ce) have enantiomeric domains that can be discriminated by means of Eu3+ photoluminescence spectroscopy. In the framework of 1 (see picture), (Si3O9)∞ spiral chains interconnect the {(Y,Ln)O6} octahedra, and channels along [100] contain…
The growth of ZnS nanoparticles by precipitation from supersaturated aqueous solution is studied by stopped-flow UV absorption spectroscopy. The average size, size distribution, and concentration of the particles are monitored within the sub-second time regime with a resolution of 1.28 ms. Particle growth at these ear…
Abstract Polyaniline (PANI) and polyaniline/fly ash (PANI/FA) composites with various concentrations of fly ash (20%, 40% and 50%) were synthesized by the process of in‐situ polymerization. The samples were characterized by powder X‐ray diffraction, thermogravimetric analysis, infrared spectroscopy, and scanning elect…
ABSTRACT: In this study, the viscoelastic properties of a low-density polyethylene (LDPE) filled with glass beads (GBs) are measured at 150 C by means of a capillary rheometer to identify the effect of the particle size on the melt viscoelasticity. The volume fraction of the GB was 8.4%. The surface of the particles h…
By transesterifying rapeseed oil with tr iethanolamine or glycerol, polyols with a hydroxyl number of 290-310 mg KOH/g were synthesized. Water-blown rigid polyurethane foams (PUFs) with an isocyanate index of 150-250 were obtained from rapeseed oil polyols. Studies on the effect of the concentration of potassium oleat…
ABSTRACT: In this article, a procedure for recycling of polypropylene (PP)-based sandwich panels is presented. PP/glass laminates as the skins and PP foam as the core material are used. The waste panel is converted into short-fiber composite material. The panel is first ground by a mill and homogenized in a mixer or a…
A series of cholesteric side chain elastomers with odd and even numbers of atoms along the spacer chain were prepared. Varying the content of odd and even spacer groups resulted in anisotropic main chain conformations changing from prolate to oblate. The conformation anisotropy was characterized by temperature-depende…
Abstract In the present work the Er‐substituted Sr hexaferrite, SrFe 12– x Er x O 19 , prepared by sol–gel self combustion and subsequent heat treatments, is investigated. The combusted powders were annealed at 800, 900 and 1000 °C for 5, 10, 20, 40, 80, 160 and 320 min. The influence of annealing temperature and time…
Abstract DFT calculations were carried out to investigate the electronic and redox properties of nitrido‐functionalized polyoxometalate species, [PW 11 O 39 (ReN)] n – ( n = 3, 4, 5) and [PW 11 O 39 (OsN)] 2– . The rhenium‐ and osmium‐nitrido effectively modify the electronic properties. The LUMOs in fully oxidized [P…
To analyze the conducting and magnetic properties near the film and substrate interface in manganites, ultrathin films $(\mathrm{thickness}\ensuremath{\le}100\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}})$ of ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ were epitaxially grown by molecular-beam epitaxy on sin…
SiO 2 has long been recognized as an inert diluent and usually used as an enhancing agent in thermoplastic polymers. Few reports are presented about its use as additive flame retardant. In this article, the flame retardant synergistic effect of SiO 2 with aluminum hydroxide (ATH) on linear low density polyethylene and…
We report that ultrathin multilayered films fabricated from plasmid DNA and synthetic polyamines undergo nanometer-scale transformations that resemble spinodal decomposition when incubated in aqueous media. The patterns and structures generated by this transformation are similar to those observed for the spinodal dewe…
Abstract The complex thermal behavior of poly( l ‐lactic acid) films crystallized from the melt, either isothermally or nonisothermally, was studied by differential scanning calorimetry (DSC), wide angle X‐ray diffraction, and small angle X‐ray scattering. The variation of the thermal behavior with crystallization tem…
ABSTRACT: In the first part of this study, fiber-reinforced microcellular foams were produced via injection molding to study their morphological properties as a function of mold temperature as well as wood, blowing agent, and coupling agent concentrations. Yellow birch wood fibers are added to a recycled postconsumer…
Using a laser monitoring observation technique, the solubilities of sodium cefotaxime (A) in binary water (B) + 2-propanol (C) solvent mixtures were determined by the synthetic method from 278.15 K to 308.15 K and in the solvent composition ( ) range from 0.025 to 1.000. The results of these measurements were correlat…
Composite films of polypyrrole-poly(vinyl sulphonic acid) (Ppy-PVS), polypyrrole-p-toluene sulphonic acid (Ppy-pTS) and polypyrrole-dodecylbenzene sulphonic acid (Ppy-DBS) were synthesized on ITO coated glass, using electrochemical polymerization. The synthesized films were characterized using electrochemical techniqu…