Materials Literature
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The incorporation of 38 nm titanium dioxide nanoparticles into an epoxy matrix to form a nanocomposite structure is described. The practical use of such materials has been evaluated through careful measurements of their electric strength made using recessed specimens as a function of particulate loading in comparison…
The present work investigates the breakdown characteristics of high voltage XLPE cable by the electrical trees under the AC and composite voltages formed by AC and DC voltage. The structure of the electrical trees resembles a Tree-like-Tree or a Bush type of tree structure. The importance of the Weibull parameters for…
The authors have developed solid insulated switchgear that does not use SF/sub 6/ gas at all as an insulating medium. This paper describes the insulating material technology, diagnostic technology for partial discharge, insulation technology of the vacuum disconnecting switch and aerial composite insulation technology…
Through a flame-melting/rapid-cooling process, metastable forms of solid state compounds can be discovered. We describe here an example where both slow and rapid crystallizations of a stoichiometric "KInSnSe(4)" melt give rise to kinetic forms of KInSnSe(4). These forms (alpha- and beta-) convert to the thermodynamica…
Saudi Arabia has four cables manufacturers, and one raw polymer material producer. XLPE and PVC are the most widely used materials in cable insulation industries. The severe weather environment of the Kingdom adds tremendous factors in stressing insulations and shortens their lifetime. The study presents preliminary r…
Abstract Lithium acrylate (LiAA) was in situ prepared in a chlorinated polyethylene (CPE) matrix through the neutralization of lithium hydroxide (LiOH) and acrylic acid (AA) during mixing. The obtained compounds were vulcanized with dicumyl peroxide (DCP). The in situ preparation and polymerization of LiAA were charac…
Eine denkbar einfache Methode zur Erzeugung von Einkristall-Clathraten besteht darin, einen Adsorbat-Einkristall in eine Gasatmosphäre zu bringen (siehe Bild; Rh magenta, O rot, C und H grau, N blau). Dieser Ansatz könnte zur Herstellung einer Vielzahl von niederdimensionalen Aggregatkristallen mit potenziellen Quante…
Abstract An equation based on the segmental/chain mobility in free volume theory was derived to correlate the gas permeation coefficient and the aging time. An accelerated physical aging of a fluoropolyimide was observed and employed to validate this equation. A strong thickness‐dependent aging process was found by em…
The secondary relaxation of poly(2-vinylpyridine) (PVPy) in a complex and blends with poly(4-vinylphenol) (PVPh) was studied by broadband dielectric spectroscopy. The polymer complex can be obtained by mixing PVPh and PVPy in methyl ethyl ketone as a result of the very strong hydrogen bonding between two polymers, and…
Morphology formation and deformation behaviour of asymmetric styrene/butadiene triblock copolymers (total polystyrene (PS) content ∼70%) consisting of PS outer blocks held apart by a styrene-co-butadiene random copolymer block (PS-co-PB) each were investigated. The techniques used were differential scanning calorimetr…
Abstract In this study, tetra isopropyl ortho titanate (TTIP) and polycaprolactone (PCL) were chosen as the ceramic precursor and the continuous phase, respectively, for the preparation of novel nanocomposites by using an in situ sol‐gel process. In addition, acrylic acid grafted polycaprolactone (PCL‐ g ‐AA) was inve…
Abnormal upfield shifts for the external azulene protons are seen in the 1H NMR spectra on oxidation of azuliporphyrins with copper(II) acetate to give highly distorted copper(II) complexes (see structure, brown Cu, blue N, red O, green H). These undergo demetalation with 10 % trifluoroacetic acid/chloroform to give u…
The molecular chain and lamellar crystal orientation in ultrathin films (thickness < 100 nm) of poly-(di-n-hexylsilane) (PDHS) on silicon wafer substrates have been investigated by using transmission electronic microscopy, wide-angle X-ray diffraction, atomic force microscopy, and UV absorption spectroscopy. PDHS show…
Abstract Lactide polymerization using zirconium(IV) acetylacetonate [Zr(acac) 4 ] as an initiator was investigated. In the reaction between Zr(acac) 4 and the monomer molecule, lactide deprotonation and the release of acetylacetone occurred. The structures of the obtained complexes were analyzed with high‐resolution N…
Abstract This investigation deals with the thermal or thermooxidative degradation behavior of three engineering polymers [e.g., poly(ethylene terephthalate) (PET), poly(ether sulfone) (PES), and poly(ether ether ketone) (PEEK)] by using thermogravimetry‐coupled mass spectrometry (TG‐MS) analysis. The experiments were…
The use of aqueous emulsions as the media when conducting cross-coupling reactions, instead of homogeneous solutions, produces covalently cross-linked conjugated polymer particles (see picture). The size of the spherical particles can easily be tuned over a wide range (mm to nm) by modification of the reaction conditi…
Abstract Grafted inorganic nanoparticles can greatly improve the mechanical performance of polymers. To examine the effects of the interfacial characteristics generated by the grafting polymer bonded to nanoparticle surfaces, we chemically grafted nano‐silica with different polymers and then melt‐mixed it with polypro…
The alignment of thin films of symmetric diblock copolymer of polystyrene and poly(methyl methacrylate), PS- b -PMMA, in an electric field was studied as a function of film thickness and interfacial energy using small-angle neutron scattering and transmission electron microscopy. There is a competition between the app…
The first theoretical evidence for tetracoordinate planar nonmetals hosted at the centers of square hydrometal complexes M4H4X (M=Cu, Ni; X=B, C, N, O; see picture) has been obtained by ab initio calculations. These predictions may open a new branch of chemistry of nonmetal-centered hydrometals with potential applicat…
Shell shock: Shell cross-linked (SCL) micelles (3) are prepared by polyelectrolyte complexation by using a micelle-forming cationic ABC triblock copolymer (1) in conjunction with an anionic diblock copolymer cross-linker (2). This ionic cross-linking approach involves polymeric reagents that form physical complexes ra…