Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses, polymerization, and characterization of novel semifluorinated methacrylates, including novel liquid-crystalline materialsChetan P. Jariwala and Lon J. MathiasCite this: Macromolecules 1993, 26, 19, 5129–5136Publication Date (Print):September 1, 1993Publication His…
Theoretical equations for dielectric, elastic and electromechanical properties of PZT (Pb(Zr, Ti)O 3 ) ceramics with open pores are derived as afunction of porosity based on the 3-3 model. This theory is applied to previous obtained experimental results. Some of them agree well with the theoretical results based on th…
In order to better understand liquid crystal alignment on a rubbed polymer surface, the authors investigated the relationship between the orientation of polymer molecules and the surface anchoring strength of liquid crystals on a rubbed surface. Measuring the IR-absorption and the optical retardation, it was found tha…
Tin-doped indium oxide (ITO) films, prepared by dc magnetron sputtering, were characterized by (photo)electrochemical measurements in aqueous H2SO4 solutions. Wavelength dependent photocurrent measurements were used to determine the optical band gap energy of these films. Electron excitation from the valence band to l…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSlow dielectric relaxation of entangled linear cis-polyisoprenes with asymmetrically inverted dipoles. 1. Bulk systemsHiroshi Watanabe, Osamu Urakawa, and Tadao KotakaCite this: Macromolecules 1993, 26, 19, 5073–5083Publication Date (Print):September 1, 1993Publication Histo…
Abstract A new amphiphilic polymer, i.e., poly(ethylene oxide) (PEO)‐grafted butyl rubber (IIR‐g‐PEO), was synthesized by chemical modification of chlorinated butyl rubber (CIIR). This synthesis was based on the reaction between chlorine in CIIR and potassium salt of polyethylene glycol monomethyl ether (PEGM). PEGM's…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeposition of copper sulfide on the surface of poly(ethylene terephthalate) and poly(vinyl alcohol) films in aqueous solution to give electrically conductive filmsTakakazu Yamamoto, Kuniaki Tanaka, Etsuo Kubota, and Kohtaro OsakadaCite this: Chem. Mater. 1993, 5, 9, 1352–135…
Abstract Polysiloxanes with covalently attached oligo ethylene oxide and di‐ t ‐butylphenol ( I ), naphthol ( II ), and hexafluoropropanol ( III ) were synthesized. The crosslinked polymers with a hexamethylene spacer were also prepared. The ion conductivities of the Li, Na, and K salts were measured as a function of…
Many discussions on packaging lead to undue expectations regarding the usability of degradable materials. There is also considerable misuse of the term “biodegradable.” The manufacture of a new foamed material based on native starch is discussed. The structure forms by water evaporation and gelatinization of starch du…
Tunable near-infrared optical parametric oscillation in an organic crystal has been achieved for the first time to our knowledge. A 1.9-mm-thick nonlinear molecular crystal of N-(4-nitrophenyl)-l-prolinol was pumped at a wavelength of 0.5927 μm and a pulse duration of 1 ns (FWHM). Tunability from 0.9 to 1.7 μm and a m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic reactions involving palladium(II) octabutoxynaphthalocyanine and molecular oxygenBoris D. Rihter, Malcolm E. Kenney, William E. Ford, and Michael A. J. RodgersCite this: J. Am. Chem. Soc. 1993, 115, 18, 8146–8152Publication Date (Print):September 1, 1993Publicat…
The crystal structure of PbTiO 3 film, which was prepared on a Pt/SiO 2 /Si substrate by metal organic chemical vapor deposition, was investigated along with its dielectric properties. The relative dielectric constant increased with increasing film thickness. Crystal structure difference was observed below 0.3 µm of f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of poly(p-phenylene-cis-benzobisoxazole) in methanesulfonic acidD. B. Roitman, R. A. Wessling, and J. McAlisterCite this: Macromolecules 1993, 26, 19, 5174–5184Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published…
After some introductory remarks on cellulose as a renewable and biodegradable polymer and the relevance of new nonaqueous solvent systems for its processing, a survey is presented on the composition, the method of action and potential applications of these solvent systems, with a distinction between “derivatizing” and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural and magnetic studies of diazine-bridged complexes of copper(II) cyanate. Crystal structure of poly[bis(cyanato-N)bis(.mu.-methylpyrazine)copper(II)]Tom Otieno, Steven J. Rettig, Robert C. Thompson, and James TrotterCite this: Inorg. Chem. 1993, 32, 2…
In order to realize nickel electrode multilayer ceramic capacitors with high capacitance per volume, the holmium-doped (Ba, Ca, Mg)(Ti, Zr)O 3 system was studied. In the case of maintaining an oxidizing atmosphere at the cooling stage, the resistivities of the dielectric materials were easily recovered by doping with…
We characterized the fluorescence intensity decays of Indo-1, which is commonly used as an emission wavelength-ratiometric calcium probe. The apparent lifetime of the long-wavelength side of the emission of Indo-1 is dependent on Ca2+. This long-wavelength emission displays the characteristics of an excited-state reac…
During weaving, warp yams are subjected to dynamic loading before stress relaxation during a loom stop. A test method is presented for simulating this behavior. There are three types of relaxation curves—simple relaxation, inverse relaxation, and mixed relaxation—depending on the previous load history of the yam. One…
Abstract A combined optical and electron microscopical study has been carried out of the crystallization habits of poly(vinylidene fluoride) (PVF 2 ) when it is crystallized from blends with noncrystallizable poly(ethyl acrylate) (PEA). The PVF 2 /PEA weight ratios were 0.5/99.5,5/95, and 15/85. Isothermal crystalliza…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerromagnetism and the .alpha. and .beta. polymorphs of anhydrous copper(II) formate: two molecular-based ferromagnets with ordering temperatures of 8.2 and 30.4 KFernando Sapina, Marcelino Burgos, Emilio Escriva, Jose Vicente Folgado, Dolores Marcos, Aurelio Beltran, and Da…