Materials Literature
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The introduction of peroxycarbonate groups onto a silica surface and the graft polymerization of vinyl monomers initiated by peroxycarbonate groups introduced onto a silica surface were investigated. The introduction of peroxycarbonate groups onto a silica surface was achieved by Michael addition of amino groups intro…
The solution of the problem of diffraction of an acoustic plane wave by a periodic boundary for frequencies close to threshold values is studied. It is shown that if the periodic structure has some special geometry, then the transformations of the diffraction pattern (Wood's anomalies) are accompanied by the occurrenc…
The morphology of immiscible blends of nylon 6 and ethylene propylene rubber blends (EPM) was studied. The blends were prepared by melt blending in a twin-screw miniextruder and a Haake Rheocord mixer. The influence of the blend ratio, time of mixing, rotation speed of the rotors, mixing temperature, and quenching of…
The spectral characteristics of aqueous zinc chloride solutions (67% w/w) containing cellulose, cellobiose, maltose, β-methyl glucoside, and glucose were compared. The results suggest that zinc ion forms loose complexes with the C2 or C3 hydroxyl groups of glucose or methyl glucopyranoside. The absorption of light in…
We briefly review the standard methods used to construct quasiperiodic tilings, such as the projection, the inflation, and the grid method. A number of sample Mathematica programs, implementing the different approaches for one- and two-dimensional examples, are discussed. Apart from small examples, the corresponding p…
Cyanoethylation of jute fibers in the form of nonwoven fabric was studied, and these chemically modified fibers were used to make jute–polyester composites. The dynamic mechanical thermal properties of unsaturated polyester resin (cured) and composites of unmodified and chemically modified jute–polyester were studied…
Carbon nanotubes are metallic, semimetallic, or semiconducting, depending on their helicity. This raises the possibility of forming nanoelectronic devices by joining tubes of differing helicity. We report calculations of the electronic properties of pairs of “armchair” and “zigzag” nanotubes joined linearly. The linea…
Wild-type mercuric ion reductase (CCCC enzyme) possesses four cysteines in each of its Hg(II) binding sites, a redox-active pair and a C-terminal pair. Mutation of the C-terminal cysteines to alanines (CCAA enzyme) leads to a loss of steady-state mercuric ion reductase activity using Hg(SR)2 substrates. However, CCCC…
Two series of new mixed-ligand nitronyl nitroxide Ni(II) complexes of [Ni(beta-diketonato)(2)(NIT2-py)] and [Ni(beta-diketonato)(tmen)(NIT2-py)](+) types with various kinds of beta-diketonates have been synthesized and structurally and magnetically characterized, where NIT2-py is 2-(2-pyridyl)-4,4,5,5-tetramethyl-4,5-…
Self-perpetuating photograft copolymerization based on the photochemistry of an iniferter benzyl N, N -diethyldithiocarbamate was utilized to design two types of microprocessed surfaces using a custom-designed apparatus operated by an X−Y step motor. Cellular adhesion and growth responses were studied on (1) a surface…
A low-molecular-weight poly( N -acryloyl- N ‘-methylpiperazine) (PAMP-L) forms miscible blends with poly( p -vinylphenol) (PVPh) while a high-molecular-weight PAMP-H forms complexes with PVPh in ethanol solutions. The glass-transition temperatures of all the blends and complexes are higher than those predicted by a li…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTAnionic Living Polymerization of 3-(Triethoxysilyl)propyl IsocyanateJae-Suk Lee and Sang-Woog RyuView Author Information Department of Materials Science and Engineering, Kwangju Institute of Science and Technology (K-JIST), 1 Oryong…
Latex based upon fluorinated acrylates such as perfluorooctylethyl methacrylate (FMA) and perfluorooctylethyl acrylate (FA) and fluorine-free acrylates such as n -butyl methacrylate (BMA) was prepared by means of emulsion polymerization in the presence of octadecyltrimethylammonium bromide (C 18 TAB) and 2,2‘-azobis(2…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTProton-Transfer Polymerization: A New Approach to Hyperbranched PolymersHan-Ting Chang and Jean M. J. FréchetView Author Information Department of Chemistry, University of California Berkeley, California 94720-1460 Cite this: J. Am. Chem. Soc. 1999, 121, 10, 2313–2314P…
Organogels formed from novel organic gelators containing a cholesterol tethered to squaraine dyes or trans -stilbene derivatives have been studied from several different perspectives. The two types of molecules are active toward several organic liquids, gelling in some cases at w/w percentages as low as 0.1. While rel…
Polymer matrix composites (PMC's) are now being used more and more extensively and over wider ranges of service conditions. Large changes in pressure, chemical environment or temperature influence the mechanical response of such composites. In the present effort, we focus on temperature, a parameter of primary interes…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPreparation and Characterization of Polyurethane−Cyclodextrin PseudopolyrotaxanesIsao Yamaguchi, Yasumasa Takenaka, Kohtaro Osakada, and Takakazu YamamotoView Author Information Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-…
The report that the pi-cation radical complexes of 5,10,15,20-tetra(2,6-dichlorophenyl)porphyrinates have a near degenerate (2) A(1u)/(2)A(2u) ground state has led us to examine their molecular structures. We wished to explore whether this near degeneracy leads to unusual structural features, namely, an alternating bo…
An isothermal oxidation apparatus (IOA) has been modified to include an oxygen sensor so that both oxidation and deposition data can be measured for jet fuels that are thermally stressed. This modification is useful for comparing the relative oxidation rates of jet fuels and fuels blended with additives. Antioxidants…
New lactide-based polydepsipeptide polymer networks and cross-linked beads have been prepared by UV photopolymerization of acrylated poly( l -lactic acid- co -glycolic acid- co - l -serine) [PLA(Glc-Ser)]. These materials have been developed for use as polymer scaffolds in tissue engineering, cell encapsulation, and i…