Materials Literature
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The handedness or chirality of molecules, organisms, and elementary particles has been widely appreciated, vindicating Pasteur’s perceptive generalization, Luni-vers est dissymktrique. Ambidexterity is rare not only in biological organisms but also in molecules. One of the most striking chiral features in biopolymers…
Exact quantum molecular overlaplike and Coulomb-like self-similarity measures are studied in a selected series of molecules with the same number of electrons. It is found that quantum molecular overlap self-similarity measures can be used to estimate the concentration of electronic charge in molecules. A good linear r…
High-quality yttrium oxide thin films can be prepared from [Y(thd) 3 ] ( 1, thd = 2,2,6,6-tetramethyl-3,5-heptanedionato) under mild conditions by the catalyst-enhanced chemical vapor deposition technique using oxygen as carrier gas. Several palladium compounds, such as [Pd(acac) 2 ] (acac = 2,4-pentadionato), [Pd(η 3…
The permittivity ε′ and dielectric loss ε" for different ratios of an ethylene propylene diene monomer (EPDM)–chloroprene rubber (CR) blend ranging from 0 to 100 phr were measured over a frequency range from 400 Hz to 60 kHz. The measurements were carried out at room temperature (25°C). The values of ε′ and ε" were fo…
Oxazoline functionalized polypropylene, polyethylene, ethylene propylene copolymer (E/P), and styrene ethylene/butylene styrene copolymer (SEBS) were studied as compatibilizers in blends of polyolefins with polyesters and polyamides. The blends investigated were polypropylene/polyamide 6, polypropylene/polybutylene te…
A study of nonequilibrium melting, nonisothermal, and isothermal crystallization behavior of ethylene/1-octene (EO) random copolymers, produced using metallocene catalysts has carried out. As branch (or defect) content increases, the nonisothermal and isothermal crystallization rates, melting temperatures, and heats o…
Engineering tissues utilizing biodegradable polymer matrices is a promising approach to the treatment of a number of diseases. However, processing techniques utilized to fabricate these matrices typically involve organic solvents and/or high temperatures. Here we describe a process for fabricating matrices without the…
2-(6-Oxido-6H-dibenz 〈c,e〉〈1,2〉 oxaphosphorin-6-yl) dimethyl itaconate (ODOP-DI) was prepared by the addition reaction between 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and dimethyl itaconate while DOPO was synthesized through multistep reaction from o-phenylphenol and phosphorus trichloride. The compo…
A series of trifunctional epoxy resins were successfully synthesized by the condensation of 2,6-dimethylol-4-methylphenol with phenol , cresol, 2,6-dimethylphenol or 2-naphthol, respectively, followed by epoxidation with a halohydrin. The structures of the synthesized triphenols were characterized by elemental analysi…
Sulfur-cured unfilled natural rubber (NR) is successfully devulcanized in a continuous extrusion process under the application of high-power ultrasonic energy. The die characteristics and ultrasonic power consumption are measured. A unique correlation is found between the crosslink density and gel fraction of the devu…
The effect of heat sealing variables (platen temperature and dwell time) on seal strength of a linear low-density polyethylene (LLDPE) was examined. In order to characterize the development of interfacial strength, blown films were heat-sealed for times from 1 to 100,000 s, much longer than the typical sealing times o…
The hydrolytic depolymerization of polyethylene terephthalate (PET) with alkaline hydroxides was investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The reactions of the mixtures were conducted in their solid states under nitrogen atmosphere. The experimental results showed th…
A procedure for surface hydrolysis of poly(glycolic acid) (PGA) meshes was developed to increase cell seeding density and improve attachment of vascular smooth muscle cells. Hydrolysis of PGA in 1N NaOH transformed ester groups on the surface of PGA fibers to carboxylic acid and hydroxyl groups. After hydrolysis, the…
Engineering tissues utilizing biodegradable polymer matrices is a promising approach to the treatment of a number of diseases. However, processing techniques utilized to fabricate these matrices typically involve organic solvents and/or high temperatures. Here we describe a process for fabricating matrices without the…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionSonolytic Decomposition of Ozone in Aqueous Solution: Mass Transfer EffectsLinda K. Weavers and Michael R. HoffmannCite this: Environ. Sci. Technol. 1999, 33, 2, 372Publication Date (Web):December 4, 1998Publication History…
We study the wetting properties by water of composite surfaces constructed from solid micrometer-size magnetic particles anchored at the interface of polymer films, in relation to the structure of the surface determined by atomic force microscopy and confocal microscopy. We measure the advancing and receding contact a…
The new solid-state alkali metal gold thiocadmates Cs2Au2Cd2S4, Rb2Au2Cd2S4, and K2Au4CdS4 photoluminesce brightly. Their interrelated polymeric structures are formed by the linking of the [CdS2]2− and [CdS4]6− anions by gold atoms (see figure).
A star-shaped molecule and a layered structure are displayed by the title compound, where the layers consist of high molecular weight polymers. A core molecule that is functionalized by six hydroxyl groups acts as the initiator for the ring-opening polymerization of ε-caprolactone, leading to a six-arm star polymer. T…
Durch Bestrahlen mit Weißlicht läßt sich die Oberfläche von porösem Silicium mit Alkenen und Alkinen gezielt funktionalisieren (siehe Schema). Die Hydrosilylierung ist sehr einfach durchführbar und führt zur Bildung stabiler strukturierter Oberflächen. Diese Methode eröffnet neue Möglichkeiten zur Verwendung von porös…
Polarization holographic gratings were inscribed in azobenzene side chain polymer films. The polarization gratings were produced using two orthogonally circularly polarized beams and the resulting stable transmission gratings were studied using a low power HeNe laser. The gratings were observed to efficiently separate…