Materials Literature
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This paper describes the development and application of scaling laws relating bulk-degradation behavior of poly(lactic acid)−poly(ethylene glycol)−poly(lactic acid) (PLA- b -PEG- b -PLA) copolymer hydrogels to the ever-changing transport properties during network degradation. Specifically, the relationships developed…
A vibrational analysis has been carried out to analyze the chain conformation of poly(lactic acid) in the crystalline state. In conjunction with a normal-coordinate analysis, the Raman spectrum has yielded data regarding conformational distributions. Raman spectra of different helices were simulated using previously p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall-Angle X-ray Scattering of PolymersBenjamin Chu and Benjamin S. HsiaoView Author Information Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400 Cite this: Chem. Rev. 2001, 101, 6, 1727–1762Publication Date (Web):May 19…
Abstract Wax‐coated old corrugated containers (OCC) are not part of the paper recycling stream because a process to remove the wax coating is not presently available. Residual waxes influence fiber–fiber bonding, reducing the paper properties of recycled OCC as well as the paper machine operating efficiency. A procedu…
Abstract Sorption measurements are executed to study the sorption behavior of propylene in a semicrystalline polymer. Decreasing values for the Flory–Huggins interaction parameter with increasing temperature are obtained. Large deviations are found, especially at higher temperatures, compared to data from the literatu…
The deactivation pathways of the singlet excited state of a series of zinc or free-base donor porphyrins covalently linked by a bridge to a paramagnetic iron(III) chloride porphyrin acceptor have been studied. These donor-bridge-acceptor systems all share a similar geometry (25 A donor-acceptor center-to-center distan…
Attractive materials for molecular electronics are the polycyclic aromatic hydrocarbons (PAHs), the hydrogen-terminated segments of a graphitic plane. Since the processing of larger PAHs, for example hexa-peri-hexabenzocoronene, is complicated by their extremely low solubilities and very small vapor pressures, the pos…
Electrical conductances, viscosity, apparent molar adiabatic compressibilities and Fourier transform (FT)-Raman spectra of sodium perchlorate (NaClO 4 ), sodium tetrafluoroborate (NaBF 4 ), and sodium tetraphenylborate (NaBPh 4 ) in 1,2-dimethoxyethane have been reported. All these electrolytes are found to be strongl…
Silicon nanocrystals, formed by ion implantation and subsequent thermal annealing, show positive optical gain under intense laser excitation. Gain has been measured by the variable strip length method where the amplified spontaneous emission intensity, which is emitted from the sample edge, is measured as a function o…
Abstract Polyacrylate‐ g ‐Carbon Black (abbrev. as gCB) was prepared by free radical polymerization of acrylate monomers on the carbon black surface, which was initiated by a redox system consisting of cerium ammonium nitrate and hydroxymethyl carbon black. gCB was ascertained by X‐ray Photoelectron Spectrometry (XPS)…
We solve the Sp( N ) Heisenberg and SU( N ) Hubbard-Heisenberg models on the anisotropic triangular lattice in the large- N limit. These two models may describe respectively the magnetic and electronic properties of the family of layered organic materials κ-(BEDT-TTF) 2 X. The Heisenberg model is also relevant to the…
The crystal structures of two hydrates of the title compound (gadodiamide I and III ) have been determined by single-crystal X-ray diffraction. Gadodiamide I crystallises in the non-centrosymmetric orthorhombic space group P 2 1 2 1 2 1, with two complexes in the asymmetric unit and 10 molecules of water. Gadodiamide…
We have recently observed an increase in the visible electroluminescence from a two-junction Si n<SUP>+</SUP>pn CMOS structure. The device emit visible light in the 450 - 750 nm wavelength region at intensities up to 1 nWmicrometers <SUP>-2</SUP> and operate at 8 - 20V and 50 (mu) A - 10mA. The device utilizes the inj…
Abstract The study was focused on the thermal degradation behavior of epoxy resins (EP) blended with propyl ester phosphazene (FR). The analysis studied the evolved gas and the residual char yield using different techniques. The results showed that pure epoxy resin and their blends were all a one‐stage thermal degrada…
Abstract 4‐ tert ‐Butylstyrene–SBR–divinylbenzene (PBSD) was prepared by the graft crosslinking polymerization of 4‐ tert ‐butylstyrene (tBS) and divinylbenzene (DVB) onto unvulcanized SBR in the solution process using BPO as an initiator. The effects of reaction conditions, such as, solvent amount, SBR content, mol r…
Abstract To evaluate the compatibilization effects of an isocyanate group on poly(ethylene terephthalate)/polypropylene (PET/PP) blends through a reactive blend, PP grafted with 2‐hydroxyethyl methacrylate‐isophorone diisocyanate (PP‐ g ‐HI) was prepared and blended with PET. In view of the blend morphology, the prese…
The rational design of catalysts with a high efficiency for the destruction of NO x compounds (DeNO x process) is a major problem in environmental chemistry. The adsorption of NO, NO 2, and N 2 O on MgO(100), Zn 0.06 Mg 0.94 O(100), Cr 0.06 Mg 0.94 O(100), and Cr 2 O 3 (0001) was studied using high-resolution photoemi…
A new class of noncoordinating anions are the carbosilane dendrimers with perfluoroarylborate end groups (see picture). They activate and stabilize metallocenes to give catalytic systems that polymerize olefins, such as ethene, propene, and 1-hexene, with high activity.
BaTiO 3 thin films were epitaxially grown on SrTiO 3 (001) and LaNiO 3 /SrTiO 3 substrates by pulsed laser deposition under different oxygen pressures. The oxygen content in the BaTiO 3 films was determined using modified Rutherford backscattering. The structural characteristics of the films were analysed by x-ray dif…
A di-walled molecular umbrella (1a) has been synthesized by acylation of the terminal amino groups of spermidine with cholic acid, followed by condensation with bis(3-O-[N-1,2,3-benzotriazin-4(3H)-one]yl)-5,5'-dithiobis-2-nitrobenzoate (BDTNB), and displacement with glutathione (gamma-Glu-Cys-Gly, GSH). Replacement of…