Materials Literature
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Abstract For a triplet competitive‐consecutive halogenation sequence forming mono‐, di‐ and trihalogenated products of the form, A + B → R + B → S + B → T, under semibatch operation adding B to A, if perfect mixing could be assumed at all scales, the product distribution would be unchanged on scaling up. However, if t…
Abstract The influence of the crown ether concentration on the reaction rate constants and the equilibrium constant in anionic (butoxymethyl)oxirane polymerization was studied. Polymerizations of (phenoxymethyl)oxirane and (2‐(9‐carbazoyl)ethoxymethyl)oxirane were carried out for the sake of comparison. The observed c…
For several reasons, biodegradable polymers have recently attracted much public and industrial interest. This contribution focuses on microbial aspects of the biodegradability of polymeric materials in the environment. It provides an overview on biodegradability and the mechanisms of degradation of relevant natural an…
Abstract Different grades of impact‐modified polystyrene were studied by viscometry, tensile impact test and colour change upon exposure to polychromatic irradiation at 55°C in air. The samples underwent extensive reduction in intrinsic viscosity [η] and tensile impact strength, and yellowed upon polychromatic irradia…
Abstract —The charge of the expandable interlayers in a series of fourteen diagenetic illite/smectites (I/S) from lower Paleozoic K-bentonites was determined by the alkylammonium ion exchange method. The magnitude (<0.50 equivalents per half formula unit) and characteristic heterogeneous distribution of interlayer…
Abstract Many fundamental questions for the understanding of polymer networks are more suitably addressed by current computer simulations than by experiments. Details of the microscopic topology, such as the elastically active cluster or loop entanglements, can be identified as well as controlled. In particular, it is…
The recycling of biodegradable thermoplastics such as ZENECA's BIOPOL range of poly-3-hydroxybutyrate and poly-3-hydroxyvalerate copolymers needs to be considered in terms of both material recycling and organic recycling by composting. BIOPOL can be recycled as regrind. The addition of BIOPOL to a model waste stream d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModular High-Tg Second-Order Polymeric Nonlinear Optical Materials. Polyfunctional Epoxide and Diisocyanate Cross-Linked Chromophoric PolyhydroxystyrenesEric T. Crumpler, Jennifer L. Reznichenko, Dequan Li, Tobin J. Marks, Weiping Lin, Paul M. Lundquist, and George K. WongCi…
Poly(3-hydroxybutyrate) [P(3HB)] was produced by Alcaligenes eutrophus from fructose or butyric acid in nitrogen-free media at different pHs and temperatures, and the time-dependent changes in the molecular weight of P(3HB) were studied. P(3HB) polymers were accumulated within cells in the presence of a carbon source,…
Edwin E. Budzinski, Jean D. Dawidzik, John C. Wallace, Harold G. Freund, Harold C. Box, The Radiation Chemistry of d(CpGpTpA) in the Presence of Oxygen, Radiation Research, Vol. 142, No. 1 (Apr., 1995), pp. 107-109
Double hysteresis loops have been observed in ferroelectric lead zirconate titanate ceramics with a Zr/Ti ratio of 65/35 (PZT 65/35). In addition, dielectric dispersion was found near 50 °C, corresponding to the high-temperature to low-temperature rhombohedral ferroelectric [FER(HT)-FER(LT)] transformation. Structural…
A chain of N monomers is attached to a small colloïdal particle, and is pulled (at a velocity V) inside a polymer melt (chemically identical, with P monomers per chain). The main parameter for this problem is the number X(V) of P chains entangled with the (N) chain. Earlier estimates of X are criticized, and a new for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin-Lattice Relaxation Enhancement of Water Protons by Manganese Porphyrins Complexed with CyclodextrinsSandip K. Sur and Robert G. BryantCite this: J. Phys. Chem. 1995, 99, 14, 4900–4905Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Pub…
The analysis of the linear and nonlinear optical properties resulting from quantum confinement in CdSSe-doped glasses is reviewed. The growth technology and the data obtained by x-ray diffraction and transmission electron microscopy methods are also reviewed. Analysis of the influence of sizes, composition, and the di…
The multipactor and flashover phenomena of alumina rf windows used in a high-power klystron have been investigated. Multipactoring due to the high yield of secondary electron emission takes place during rf operation. A spectrum analysis of luminescence due to multipactoring shows that multipactor electron bombardment…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of Cobaltaboranes Containing Cobalt Carbonyl FragmentsChang-Soo Jun, Jean-Francois Halet, Arnold L. Rheingold, and Thomas P. FehlnerCite this: Inorg. Chem. 1995, 34, 8, 2101–2107Publication Date (Print):April 1, 1995Publication History Publis…
Using a two-dimensional smectic liquid crystal model, we have shown the plausibility of electrical solitary wave propagation along a bimolecular leaflet such as the cell membrane of a nerve axon which consists of chiral, lipid building blocks. Our model is a head-to-tail correlated ferroelectric, chiral Sm-${\mathit{C…
We address several problems concerning thermal hysteresis and its characterization. Based on the time-dependent Ginzburg-Landau theory of the (${\mathrm{\ensuremath{\Phi}}}^{2}$${)}^{3}$ model with O(N) symmetry in the large -N limit, we obtain numerically familiar spindle-shaped thermal hysteresis loops under linearl…
Abstract Late Cretaceous to Quaternary terrestrial sediments derived from fault scarps and actively growing folds in schist and greywacke basement are locally preserved in Otago and South Canterbury, New Zealand. Sediments are immature, sparsely carbonaceous, and generally poorly sorted and have undergone little oxida…
Redox chemistries of cobalt(II) and iron(II) phthalocyanines, as well as interactions of the reduced phthalocyanines with oxygen, have been studied using spectroelectrochemical and other transient electrochemical techniques in nonaqueous solutions including pyridine, dimethylsulfoxide, and dichloromethane. Results ind…