Materials Literature
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The defect structure in 3 mol% Y‐TZP was studied by correlated internal friction, dielectric loss, and ionic conductivity experiments. A prominent mechanical and dielectric loss peak occurs in the temperature range between 380 and 550 K that depends on the frequency of measurement. The relaxation parameters were deter…
Abstract Model butanediol–MDI–polypropylene oxide polymers have been synthesized to explore the structure–property relationships in urethane/polyether polymers. The results of mechanical, thermal, and spectroscopic analyses agree remarkably well. The phase mixing in these polymers decreases with increasing hard‐segmen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFirst structural characterization of a boron-centered radical: x-ray crystal structure of [Li(12-crown-4)2]+ [BMes3]-.bul.Marilyn M. Olmstead and Philip P. PowerCite this: J. Am. Chem. Soc. 1986, 108, 14, 4235–4236Publication Date (Print):July 1, 1986Publication History Publ…
Electrical conduction phenomena in polyimide (Kapton) films were studied with particular attention devoted to the separation of interface and bulk phenomena. The measurements were carried out with a variety of methods in the temperature range of 50 to 270 °C at electrical fields of 104 to 6×105 V/cm and at time interv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination of lanthanides by two polyamino polycarboxylic macrocycles: formation of highly stable lanthanide complexesM. F. Loncin, J. F. Desreux, and E. MercinyCite this: Inorg. Chem. 1986, 25, 15, 2646–2648Publication Date (Print):July 1, 1986Publication History Publishe…
Abstract Various acidic compounds were tested as potential initiators of the cationic polymerization of L,L ‐dilactide. Regardless of solvent and temperature only trifluoromethanesulfonic acid and methyl triflate proved to be useful initiators. With methyl triflate as initiator L,L ‐dilactide polymerizes faster than d…
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Layering transitions of colloidal crystals confined between two smooth glass surfaces have been studied by transmission diffraction of light as well as direct-lattice imaging with an optical microscope. The polystyrene spheres we studied have diameter \ensuremath{\Phi}=0.305 \ensuremath{\mu}m and a surface charge of \…
We have measured, as a function of temperature and frequency, the velocity and attenuation of ultrasound near the glass transition of glycerol. The data are compared with that from frequency-dependent specific-heat measurements recently performed on the same sample. When the difference between adiabatic and isothermal…
Various aspects of the tetragonal ( t ) to monoclinic ( m ) transformation during degradation have been studied experimentally and theoretically in yttria‐stabilized tetragonal zirconia polycrystals (Y‐TZP), i.e., polycrystalline t ‐ZrO 2 containing Y 2 O 3 in solution. Transmission electron microscopy (TEM) revealed…
Photovoltaic and structural characteristics of Langmuir-Blodgett film photocells have been studied using asymmetrically substituted copper phthalocyanine (asy-CuPc). By polarized-light absorbance measurements, each phthalocyanine molecule was found to be arranged in the film with its ring facing towards the dipping di…
The passive region of stainless steels (SSs), as defined by the low current regime between the active-passive transition and the pitting potential or the transpassive potential, is discussed in terms of solid solution alloying and microstructure. In considering the beneficial effects of solid solution alloying, emphas…
Abstract The historical development of both main‐chain (M.C.) and side‐chain (S.C.) liquid crystalline polymers (LCPs) is presented. Synthetic routes and characterization techniques for LCPs are introduced. Various approaches to reduce the melting points of M.C. LCPs and to increase the mesogenic order of S.C. LCPs ar…
The symmetry of quasi-crystals, a class of materials that has recently aroused interest, is discussed. It is shown that a quasi-crystal is a special case of an incommensurate crystal phase and that it can be described by a space group in more than three dimensions. A number of relevant three-dimensional quasi-crystals…
Highly c-axis oriented and epitaxial PbTiO3 thin films were grown on MgO single crystals and epitaxial Pt film substrates by the rf-magnetron sputtering method. The films with a 98% c-axis orientation rate were obtained under low deposition rate (<20 Å/min) and low gas pressure (∼1 Pa) using a PbO-rich target.…
Abstract The electropolymerization of 1-pyrenamine (PA) in an acetonitrile solution led to the polymeric film formation on electrode surfaces. The chemical, spectroscopic, electrical and electrochemical characterization of the resulting poly(1-pyrenamine) (PPA) films was carried out. The number-average molecular weigh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOsmotic pressure of foams and highly concentrated emulsions. I. Theoretical considerationsH. M. PrincenCite this: Langmuir 1986, 2, 4, 519–524Publication Date (Print):July 1, 1986Publication History Published online1 May 2002Published inissue 1 July 1986https://pubs.acs.org/…
We have performed self-consistent density functional calculations on semiconductor heterojunctions, using ab initio nonlocal pseudopotentials, and have derived valence band discontinuities for many different interfaces between both lattice-matched and strained epitaxial layers. The agreement with reported experimental…
The chirality of biologically active S-adenosyl-L-methionine (AdoMet) is S,S, where the designations refer to the sulfur and the alpha-carbon, respectively. This paper describes a cation-exchange high-performance liquid chromatographic (HPLC) method for separating (S,S)-AdoMet from the biologically inactive (R,S)-AdoM…
Abstract The first description of the bound rubber phenomenon was by Twiss in 1925, who made the observation that the resistance of carbon black-natural rubber mixes to solvents was related to improved mechanical properties. Boiry studied many of the factors influencing the insolubilization of NR by fillers including…