Materials Literature
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The order−disorder transition in a melt of asymmetric micelle-forming diblock copolymers is studied analytically in the strong segregation limit. In contrast to previous calculations by Semenov and by self-consistent mean-field theory, both the translational entropy of the micelles in a disordered micelle regime and t…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTThemoreversible Cross-Linking Rubber Using Supramolecular Hydrogen-Bonding NetworksKeisuke Chino and Makoto AshiuraView Author Information Research & Development Center, The Yokohama Rubber, Co. Ltd., 2-1 Oiwake, Hiratsuka, Kanagawa 254-8601, Japan Cite this: Macromolecules 200…
Regenerated cellulose (RC) films having various viscosity-average molecular weights ( M η ) ranging from 2.2 × 10 4 to 8.2 × 10 4 g/mol were prepared from cotton linters in 6 wt % NaOH/4 wt % urea aqueous solution by coagulation with 2 M acetic acid and 2% H 2 SO 4 aqueous solution. The dissolution of cellulose and th…
We study the behavior of water droplets confined in a carbon nanotube by means of parallel molecular dynamics simulations. We report radial density profiles, radial hydrogen bond distributions, and contact angles for tube radii ranging from 12.5 to 37.5 Å and for droplets containing up to 4632 water molecules. Our res…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSubstituent Effects on Microstructure and Polymerization of PolyalkylsilsesquioxanesHie-Joon Kim, Jin-Kyu Lee, Jin-Bum Kim, Eun Su Park, Sung-Jun Park, Dae Young Yoo, and Do Y. YoonView Author Information School of Chemistry, Seoul National University Seoul 151-747, Ko…
Abstract Ten model coatings, selected and obtained from a family of fluorinated resins synthesized by the reaction of perfluoroether oligomeric diols of different molecular weights with polyisocyanurates of hexamethylenediisocyanate (HDI) and isophoronediisocyanate (IPDI), were characterized with differential scanning…
Ytterbium metal reacts with PhEEPh (E = S, Se, Te) and elemental Se in pyridine to give (pyridine)(8)Yb(4)(SeSe)(2)(Se)(2)(mu(2)-SPh)(2)(SPh)(2), (py)(8)Yb(4)Se(SeSe)(3)(SeSeSePh)(Se(0.38)SePh), and (py)(8)Yb(4)Se(SeSe)(3)(SeSeTePh)(SeTePh), respectively. The SePh and TePh compounds contain a square array of Ln(III) i…
The electrodeposition of polysiloxane precursor polymers to form cross-linked conjugated polythiophene ultrathin films is described. The precursor polymer contains a polysiloxane backbone with pendant electroactive thiophene monomer units synthesized via a hydrosilylation reaction. The thiophene units were electropoly…
Geranylgeranylglyceryl diphosphate synthase (GGGP synthase) catalyzes alkylation of (S)-glyceryl phosphate [(S)-GP] by geranylgeranyl diphosphate (GGPP) to produce (S)-geranylgeranylglyceryl phosphate [(S)-GGGP]. This reaction is the first committed step in the biosynthesis of ether-linked membrane lipids in Archaea.…
Electrochromic devices composed of laminated polymer layers, as the working electrode, and vanadium pentoxide, as the counter electrode, were prepared and evaluated. Three different laminate systems were investigated using various combinations of poly(3,4-ethylenedioxythiophene), poly( N -methylpyrrole), and polyanili…
Abstract The β‐crystalline form of isotactic poly(propylene) (PP) has been long recognized to have a greater mechanical absorption capacity than the α‐crystalline form. This is of major importance for improving impact properties and crack resistance of injection‐molding parts. Unfilled PP samples together with calcium…
Abstract Environmental stress cracking (ESC) in poly(methyl methacrylate) under different humidity conditions has been investigated. Constant stress‐intensity factor ( K ) ring‐type specimens were prepared, and all specimens were equilibrated at five different humidity conditions for about two years. ESC tests were ca…
The imidization behavior and structural evolution in a microscaled film of poly(3,4‘-oxydiphenylene pyromellitamic acid) precursor are studied by time-resolved synchrotron wide-angle X-ray diffraction and infrared spectroscopy to investigate the relationship between thermal imidization and structural evolution in the…
The application of high intensity ultrasound to liquids leads to cavitation. In contrast to the homogeneous situation this is poorly understood close to a surface despite the implications for many biological, chemical, and physical applications. By using ultrafast electrochemical equipment and arrays of electrodes, we…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Assembly of Unlike Homopolymers into Hollow Spheres in Nonselective SolventHongwei Duan, Daoyong Chen, Ming Jiang, Wenjun Gan, Shanjun Li, Min Wang, and Jie GongView Author Information Department of Macromolecular Science and The Key Laboratory of Molecular Engine…
A relatively new technique based on the sequential adsorption of oppositely charged polymers affords the fabrication of multilayer thin films with controlled molecular architectures. In this work, we report the first study on the impedance and dielectric characteristics of multilayer films created by the sequential ad…
We use a tight-binding total energy method, with parameters determined from a fit to first-principles calculations, to examine the newly discovered gamma phase of titanium. Our parameters were adjusted to accurately describe the alpha Ti-omega Ti phase transition, which is misplaced by density functional calculations.…
We propose a unified moving boundary problem for surface growth by electrochemical and chemical vapor deposition, which is derived from constitutive equations into which stochastic forces are incorporated. We compute the coefficients in the interface equation of motion as functions of phenomenological parameters. The…
This paper, based on a presentation at the Spintronics 2001 conference, provides a review of our studies on II-VI and III-V Mn-doped Diluted Magnetic Semiconductors. We use simple models appropriate for the low carrier density (insulating) regime, although we believe that some of the unusual features of the magnetizat…
We have studied growth and properties of quaternary alloy magnetic semiconductor (InGaMn)As grown both on GaAs substrates and on InP substrates by low-temperature molecular-beam epitaxy (LT-MBE). (InGaMn)As thin films were ferromagnetic below ~30 K, exhibiting strong magneto-optical effect. The lattice constant of [(I…