Materials Literature
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Abstract Two series of waterborne polyurethane–urea anionomers were prepared by a polyaddition reaction with isophorone diisocyanate, poly(tetramethylene oxide) glycol (weight‐average molecular weight = 1000), dimethylol propionic acid (DMPA), and ethylene diamine as chain extenders. Triethylamine (TEA) or 28:1 mol/mo…
Abstract Freeze and freeze‐thaw durability characteristics of fiber reinforced polymer (FRP) composites, especially in the presence of moisture, need to be investigated prior to the widespread implementation of these materials in civil, polar, and offshore structural components and systems. The hygrothermal degradatio…
The reaction between [Co(H2O)6]2+ and [Co(CN)5]3- in deoxygenated water yields a dark blue solid of composition Co3[Co(CN)5]2.8H2O (1). X-ray powder diffraction data indicate a cubic Prussian blue-type framework, wherein the hexacyanometalate positions have only a two-thirds occupancy of square-pyramidal [Co(CN)5]3- u…
New complexes of the Schiff base salicylidene-2-aminothiophenol with VO(IV), Co(II), Ni(II), Cu(II) and Zn(II) have been synthesized and studied by thermogravimetric analysis and a general scheme of thermal decomposition of these complexes is proposed. The thermal dehydration and decomposition of these complexes were…
Abstract The nylon4 portion in the blend films composed of nylon4 and nylon6 was degraded and completely disappeared within 4 months in two kinds of composted soils gathered from different university farms as well as pure nylon4 film reported previously, while the nylon6 portion remained even after the burial test for…
The reaction of a nickel dithiolene complex (1) and ethylene is a two-step process, in which the trans-product (2) forms first in the direct addition of the olefin to 1, while the more thermodynamically stable cis-product (3) involves isomerization of 2. The introduction of electron-withdrawing groups (cyano or triflu…
The change in the surface structure of poly[(R)-3-hydroxybutyrate] [PHB] films upon the enzymatic hydrolysis was analyzed by attenuated total reflection infrared [ATR/IR] spectrometry. As enzymes, PHB depolymerases isolated from Ralstonia pickettii T1 and Pseudomonas stutzeri were used. By curve decomposition of the c…
A series of new triphenylamine-containing aromatic poly(amine- imide)s with high molecular weights were prepared either by a conventional two-step process starting from N,N′-bis(4-aminophenyl)-N,N′-diphenyl-1,4-phenylenediamine with various aromatic tetracarboxylic dianhydrides or by the one-step thioanhydride method…
A one-pot solvothermal reaction of iron(II) with meso-tetra(4-pyridyl)porphyrin (TPyP) leads to two novel layered structures with an unprecedented two-dimensional paddle-wheel-like pattern; the two structures have the same composition Fe(TPyP) but a different packing sequence, namely ...ABAB... and ...ABCDABCD....
Abstract Low molecular, water‐soluble chitosan (LMWSC) with a free amine group was prepared by the novel salts‐removal method described in this study. A weight‐average molecular weight and degree of deacetylation (DDA) of LMWSC were determined by viscometry and Kina titration, resulting in 18,579 Da and 93% DDA, respe…
The hydrothermal reaction of Ln(2)O(3) (Ln = Dy and Ho), Cu(OAc)(2).2H(2)O, and oxydiacetic acid in the approximate mole ratio of 1:3:8 resulted in the formation of two new members of the isostructural series of polymers formulated as [(Cu(3)Ln(2)(oda)(6)(H(2)O)(6)).12H(2)O](n), crystallizing in the hexagonal crystal…
Abstract Blend films of silk fibrion (SF) and poly(vinyl alcohol) (PVA), with glycerin as an additive, were made, and the structure and properties of the blends were investigated by scanning electron microscopy (SEM), Fourier transform infrared (FT‐IR) spectroscopy, differential scanning calorimetry (DSC), and wide‐an…
The effects of hydrogen on the ground-state electronic and magnetic structures of ${\mathrm{AB}}_{2}$ (A=Zr; $B=\mathrm{V},$ Cr, Mn, Fe, Co, Ni) Laves phase compounds were investigated by first-principles local-density-functional calculations. We calculated the relative stability of atomic hydrogen at various intersti…
Abstract A triamine monomer, 1,3,5‐tris(4‐aminophenoxy)benzene (TAPOB), was synthesized from phloroglucinol and 4‐chloronitrobenzene, and it was successfully polymerized into soluble hyperbranched polyimides (HB PIs) with commercially available dianhydrides: 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride (6FDA),…
Structural relaxation of fragile glass-forming liquids in the vicinity of the glass transition were measured by dielectric spectroscopy, as a function of temperature and pressure. From the volume dependence of the relaxation times, we show that the effects of thermal and free volume fluctuations are comparable. The im…
Exfoliated K4Nb6O17 bilayer nanosheets in extraordinarily large size (ca. 100 microns) were prepared by the direct reaction of K4Nb6O17.3H2O crystals with an aqueous solution of propylamine; the size was extremely larger than that of exfoliated nanosheets (several microns) reported previously.
A theoretical comparative study of complexes of porphyrin (P), porphyrazine (Pz), and phthalocyanine (Pc) with metal (M) = Fe, Co, Ni, Cu, and Zn has been carried out using a DFT method. The calculations provide a clear elucidation of the ground states for the MP/Pz/Pc molecules and for a series of [MP/Pz/Pc](x-) and…
The optical and photophysical properties of phenylacetylene dendritic macromolecules based on unsymmetrical branching are investigated using steady-state and time-dependent spectroscopy. Monodendrons, up to the fourth generation, are characterized with and without a fluorescent perylene trap at the core. The higher ge…
We performed in situ transport measurements in a transmission-electron microscope (TEM) on individual double-walled carbon nanotubes (DWNT). Using selected-area electron diffraction, the chiral indices of the two tubes constituting the DWNTs were determined through careful comparison with theory. We discuss the case o…
A laser with an active volume consisting of only a single quantum wire in the 1-dimensional (1-D) ground state is demonstrated. The single wire is formed quantum-mechanically at the T-intersection of a 14 nm Al_{0.07}Ga_{0.93}As quantum well and a 6 nm GaAs quantum well, and is embedded in a 1-D single-mode optical wa…