Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyelectrolyte Monolayers at the Mica/Air Interface: Mechanically Induced Rearrangements and Monolayer AnnealingK. Lowack and C. A. HelmCite this: Macromolecules 1995, 28, 8, 2912–2921Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Publis…
The microstructure of the shell of the abalone Haliotis fulgens consists of alternate layers of aragonite and prismatic calcium with darker organic matrix (conchiolin) that are visible as rings when the shell is ground down at the spire. This abalone deposits about four prismatic layers in the first year and three lay…
Abstract Cocrystallization and phase segregation phenomena of polyethylene (PE) blends between fully deuterated high‐density PE (DHDPE) and hydrogeneous PE with various degrees of ethyl branching have been investigated on the basis of DSC, FTIR, synchrotron X‐ray scattering, and neutron scattering measurements. When t…
A series of thermoplastic polyurethanes was synthesized with varying hard segment composition or content and the effect of the hard segments on morphology and properties was studied by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), thermal mechanical analysis (TMA), Fourier transform infra…
For the first time an attempt has been made to determine the lattice parameter, density, and molar mass of an isotopically highly enriched silicon-28 crystal. The goal was to achieve an independent value of Avogadro's constant of accuracy equal or superior to current best values obtained from similar measurements of v…