Liquid crystalline polymeric phthalocyanines
The first examples of phthalocyanine linear mainchain polymers showing liquid crystal properties are described.
Materials Literature
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Catalytic activity of platinum after exchange with surface active functional groups of carbon blacks
The deposition of platinum on various carbon blacks has been carried out by forming active functional groups on the surface of the carbon support, and exchanging these active groups with different platinum complexes. Using H2PtCl6 solution, an aggregation rather than an exchange takes place. In this case, the anionic…
Structure and Defects in Sanidic Liquid Crystalline Polymers. 1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Defects in Sanidic Liquid Crystalline Polymers. 1I. G. Voigt-Martin, P. Simon, S. Bauer, and H. RingsdorfCite this: Macromolecules 1995, 28, 1, 236–242Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 Janu…
Interaction Between Wood and Synthetic Polymers
Publisher Summary This chapter describes that the structure and properties of the wood fiber-polymer matrix interphase play a major role in determining the mechanical and physical properties of the composite material. The interphase or adhesion between the fiber and the matrix has little effect on the composite stiffn…
In Vitro Study of the Anti-Leishmanial Activity of Biodegradable Nanoparticles
Leishmania are obligate intracellular parasites, responsible for leishmaniasis. Leishmaniasis are transmitted via insect vector to vertebrate hosts including humans. The infection was reproduced in vitro with promastigotes which can infect murine resident peritoneal cells. Amphotericin B was incorporated into poly(D,…
Adhesion assessment of DLC films on PET using a simple tensile tester: Comparison of different theories
The adhesion of Diamond-Like Carbon (DLC) films on Poly(ethyleneterephthalate) (PET) sheet has been characterised by tensile testing, using simple equipment. Three theoretical analyses of the tensile test are described, and their validity has been studied by calculating in three different ways the adhesion of the same…
Preparation of Amorphous Boron Nitride from the Reaction of Haloborazines with Alkali Metals and Formation of a Novel Tubular Morphology by Thermal Annealing
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of Amorphous Boron Nitride from the Reaction of Haloborazines with Alkali Metals and Formation of a Novel Tubular Morphology by Thermal AnnealingEwan J. M. Hamilton, Shawn E. Dolan, Charles M. Mann, Hendrik O. Colijn, and Sheldon G. ShoreCite this: Chem. Mater. 1…
Hydrogen Occlusion Behavior during Delayed Fracture in Cold Drawn Steel Wire and Heat Treated Steel Bar for Prestressed Concrete
Stress-relieved steel wire for prestressed concrete (PC Wire), which is produced with cold drawing, has a higher resistance to delayed fracture than steel bar for prestressed concrete (PC Bar), which is produced with heat treatment. However, the hydrogen occlusion behavior of PC Wire has not been investigated yet. To…
Concentration of Radiocarbon and Its Chemical Forms in Gaseous Effluents, Environmental Air, Nuclear Waste and Primary Water of a Pressurized Water Reactor Power Plant in Hungary
We measured airborne releases of 14 C from the Paks Pressurized Water Reactor (PWR) Nuclear Power Plant (NPP). Two continuous stack samplers collect 14 C in 14 CO 2 and 14 C n H m chemical forms. 14 C activities were measured using two techniques; environmental air samples of lower activities were analyzed by proporti…
Controlled release from poly(phosphoester) matrices
A class of biodegradable polymers, poly (phosphoesters), was studied for its potential as a matrix for controlled drug delivery. The degradability of the phosphorus ester linkage and the versatility of phosphorus-containing polymers make poly (phosphoesters) attractive candidates for development as a degradable biomat…
Temperature-programmed reduction of alumina-supported Ni–Pt systems
A series of alumina-supported nickel–platinum systems containing varying amounts of both components has been studied by temperature-programmed reduction (TPR) and oxidation (TPO), X-ray diffraction (XRD) and hydrogen chemisorption. The reduction of calcined catalyst precursors was enhanced by even a small amount of pl…
Synthesis and characterisation of ytterbium(II) alkyls
The following complexes were obtained and characterised: [Yb(CHR2)2(OEt2)2]1 from YbI2 and 2 NaCHR2; [Yb(CHR2)3Na] from Ybl2 and 3 Na(CHR2); 1 and [Yb(CHR2)(OR′)(OEt2)2] from [Yb(OR′)2(OEt2)2] and 2 K(CHR2); [Yb(CHR2)(OR′)(thf)3] from [Yb(OR′)2(thf)3] and 1 K(CHR2); [Yb(CHR2)2(tmen)] from [Yb(η-C5Me5)2(OEt2)], 2 Li(CH…
Nonlinear Oscillations of a Cluster of Bubbles in a Sound Field. Bifurcation Structure.
This paper deals numerically with nonlinear oscillations of spherical bubbles in a sound field. A Governing equation of a cluster of interacting spherical bubbles is obtained by taking account of the compressibility of a liquid. This equation includes previous results for both single bubble and two bubbles as special…
Plane-wave reflection from uniaxial chiral interface and its application to polarization transformation
Plane-wave reflection and transmission in a planar interface between air and an axially chiral uniaxial medium whose axis is parallel to the interface is considered in the present study. By finding the reflection dyadic and its eigensolutions, we demonstrate that by dimensioning the uniaxial medium in a proper way, it…
Steroidal Glycosides from Roots of Cynanchum caudatum M. II.
The roots of Cynanchum caudatum M. (Asclepiadaceae) afforded eleven new pregnane glycosides which had cynanchogenin, caudatin, 12-O-benzoyllineolon and 12-O-benzoyldeacylmetaplexigenin as the aglycone moiety and 2,6-dideoxy-3-O-methylhexopyranoses as component sugars. The structures of these compounds were elucidated…
Novel discotic liquid crystals created by electrophilic aromatic substitution
Penta-, hexa- and hepta-alkoxy derivatives of triphenylene can be smoothly mono-nitrated in high yield to give novel discotic liquid crystals with enhanced mesophase properties. We have investigated the regiochemistry of these reactions which appear to be controlled by a combination of steric and electronic factors. N…
Mechanical Characteristics of Coated Fabrics
When fabrics are coated, their deformation behaviour changes considerably. The tensile, shear, and bending properties of four typical coated fabrics have been measured using the FAST system and an Instron tensile machine. The fabrics were measured before coating, after coating and after subsequent stretching or sheari…
NMR characterization of the supported 12-heteropoly acids
Catalysts have been prepared by the incipient wetness method and characterized by 31P MAS NMR spectroscopy. Two species, i.e. the interacting molecular and the crystalline, were found in both the supported PMo12 and supported PW12 catalysts. Experimental results indicated that the interacting species are more thermall…
Synthesis of nanophase oxalate precursors of YBaCuO superconductor by coprecipitation in microemulsions
A microemulsion has been studied as a reaction medium to control the coprecipitation of oxalate precursors of the superconducting YBa2Cu3O7 -δ ceramics. The oxalate coprecipitation of Y, Ba and Cu from nitrate solution was studied on basis of computer modelling of equilibrium systems. The optimum operating conditions,…
Synthesis of Reactive Functionalized Oligo(p-phenylene sulfide)s
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Reactive Functionalized Oligo(p-phenylene sulfide)sEishun Tsuchida, Kimihisa Yamamoto, Kenichi Oyaizu, Fumiaki Suzuki, Allan S. Hay, and Zhi Yuan WangCite this: Macromolecules 1995, 28, 2, 409–416Publication Date (Print):January 1, 1995Publication History Publis…