Materials Literature
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Abstract The hole transport of trans ‐1,2‐biscarbazolylcyclobutane (CB) doped poly(bisphenol A carbonate) (PC) film has been investigated in the CB concentration range of 3.8 × 10 −4 mol cm −3 (12 wt%) to 1.6 × 10 −3 mol cm −3 (51 wt%). The hole mobility increased drastically with increasing CB concentration. The hole…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution-crosslinked networks. 3. Dielectric normal mode process of guest polyisoprene in natural rubber networksBeng Teik Poh, Keiichiro Adachi, and Tadao KotakaCite this: Macromolecules 1987, 20, 10, 2574–2579Publication Date (Print):October 1, 1987Publication History Publ…
A transmission-electron-microscopy study has been made of early stages in the development of irradiation damage in copper-germanium alloys irradiated at temperatures from 355 K to 623 K to fast neutron doses between 1021 n m−2 and 2 × 1022 n m−2 (E > 1 MeV). The various components of the damage microstructures are ana…
Softening of thermoplastic polyurethanes (TPU) in a simulated body environment (37 degrees C n-saline) was studied as a function of composition, structure and resultant morphology of these (AB)n type block copolymers. The structural variations were attempted by changing chemical composition and molecular weight of bot…
The absorption of H 2 O on stepped and planar surfaces of SrTiO 3 (100) has been studied using soft X-ray photoemission. Valence band spectra indicate that H 2 O dissociates on the stepped surface, with an initial sticking coefficient approaching unity. In contrast, H 2 O adsorbs molecularly on the planar surface, at…
The structural and bonding properties of Ti-6Al-4V adherends, prepared by chromic acid anodization (CAA), were studied as a function of exposure in high-temperature environments such as vacuum, air, boiling and pressurized water, and steam. Subsequent to the environmental exposure, bonds were produced and the adhesive…
Abstract Polyurethane elastomers were prepared from a series of poly(ethylene oxide) samples by end‐linking the chains into “model” trifunctional networks. The molecular weight M c between crosslinks in such networks is simply the number‐average molecular weight M n of the precursor polymer. End‐linking samples separa…
The crystal structure of 4,4'-difluorobiphenyl has been determined at different temperatures between 155 and 293 K. This compound is isostructural with biphenyl (P21/a, Z = 2). We have carefully analysed the evolution of thermal motion by refining the translational and librational tensors. At any temperature, the mole…
Abstract Fluorine‐containing polyarylates having inherent viscosities of 0.2–0.8 dL/g were prepared from tetrafluoroisophthaloyl chloride and various bisphenols by low temperature solution polycondensation in chloroform with triethylamine or by two‐phase polycondensation in a dichloromethane‐water or nitrobenzene‐wate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular and electronic structure of six-coordinate low-spin oxo-bridged dimers formed by the interaction of (.mu.-oxo)bis((phthalocyaninato)iron(III)) with nitrogen basesClaudio Ercolani, Marcello Gardini, Keith S. Murray, Giovanna Pennesi, Gentilina Rossi, and Peter R. Zw…
Given current clinical use of phospholipid bilayer structures (liposomes/vesicles) as nontoxic drug delivery vehicles, we have addressed the possibility of employing the phospholipids themselves as MRI contrast agents. To this end we have synthesized phosphatidylcholine with a nitroxide spin label replacing one methyl…
Cerium activated Y 3 Al 5 O 12 has been grown by liquid phase epitaxy (LPE) from a PbO ‐ B 2 O 3 flux. Cathodoluminescence measurements of ( Y 3 − x Ce x ) Al 5 O 12 show an internal efficiency of 6.5% at the film composition and optimal growth conditions. Numerous lanthanide ions were studied in a series of LPE film…
Various methods of determining the pemeability of textile fabrics to the passage of water vapour have been developed and described. An investigation was undertaken to compare the Canadian General Specifications Board (CGSB) Control Dish Method, the apparatus and method described by Farnworth and Dolhan (the DND Method…
A controllable heat sealing technology, based on blends of DURAFLEX* poly butylene polymer (poly-1-butene) with low density polyethylenes, ethylene-vinyl ace tate copolymers (EVA) and other polyolefins is discussed. A variety of systems are described which provide easy-open or peelable seals on various substrates for…
The air resistance of a fabric is an important factor in determining its various end uses. In this paper the measured air resistance of 140 needle-punched fabrics made from 16 different fibers is investigated. An empirical relationship is fitted to the mea sured air resistance data using stepwise multiple regression a…
Abstract Okhotskite, an Mn 3+ -dominant pumpellyite-group mineral, is monoclinic, A 2/ m, a = 8.887, b = 6.000, c = 19.55 Å, β = 97.08°, Z = 1. The formula is (Ca 7.63 Na 0.17 K 0.01 ) Σ7.81 (Mn 2.75 2+ Mg 1.10 ) Σ3.85 (Mn 4.50 3+ Al 1.87 Fe 1.61 3+ Ti 0.02) Σ8.00 Si 12.13 O 39.71 (OH) 16.29 , which simplifies to Ca 8…
Abstract Current understanding of the origin of illite cements within the pore systems of sandstone reservoirs is at best speculative whilst knowledge of the control of illite morpholoy is, to all practical purposes, non‐existent. This is unfortunate considering the widespread occurrence of illite and the often disast…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMeasurement of .gamma..infin. using GLC. 2. Results for the stationary phases N-formylmorpholine and N-methylpyrrolidoneUlrich Weidlich, Hans Juergen Roehm, and Juergen GmehlingCite this: J. Chem. Eng. Data 1987, 32, 4, 450–453Publication Date (Print):October 1, 1987Publicat…
Biomaterials are materials that are used in medical devices that are intended to interact with biological systems. These medical devices include the now common hip replacements and prosthetic heart valves, and the less common neurological prostheses and implantable drug delivery systems. Biomaterials include the tradi…
The theory of magnetic hardening and its impact on the design of permanent magnets is presented. The statistical theory of domain-wall pinning by sample inhomogeneities is outlined, and its relevance to the latest generation of permanent magnets is discussed.