Materials Literature
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Poly(ether ester) block copolymers based on polyethylene oxide (PEO) and polylactic acid (PLA) segments were synthesized and characterized, with the aim of developing a new family of bioadsorbable polymers. The materials developed were tailored to meet various mechanical and degradation requirements, and overcome the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal-oxygen multiple bond lengths: a statistical studyJames M. MayerCite this: Inorg. Chem. 1988, 27, 22, 3899–3903Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Published inissue 1 November 1988https://pubs.acs.org/doi/10.1021/ic0029…
Abstract The morphology of compatibilized polyolef in/polyamide blends was found to be significantly dependent on the concentration of an ionomer compatibilizer (polyethylene‐methacrylic acid‐isobutyl acrylate terpolymer) in the blend. For a dispersed phase content of 10% by weight, a maximum reduction in phase size w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrodeposition of platinum microparticles into polyaniline films with electrocatalytic applicationsKent M. Kost, Duane E. Bartak, Beth. Kazee, and Theodore. KuwanaCite this: Anal. Chem. 1988, 60, 21, 2379–2384Publication Date (Print):November 1, 1988Publication History Pu…
A systematic study of the dependence of the band gap, the linear optical susceptibility, the polarizability α, and the second hyperpolarizability γ, on the number of repeat unit is conducted for the thiophene series from monomer to hexamer. The linear optical susceptibilities for oligomers have been determined from th…
Abstract The rapid growth in the use of multiphase polymer systems (blends and composites) is undoubtedly related to the availability of methods of controlling the physical and chemical interactions at the interface. Compounds acting as interfacial agents are commonly known as “compatibilizers” in blends, or “coupling…
Numerical simulations of mercury injection using three-dimensional resistor networks demonstrate that the electrical resistance decreases in stepwise fashion with increasing occupation probability near the resistance percolation threshold. The power-law nature of the resistance-step distribution and the value of the e…
A remarkable absorption spectral change has been observed in ethylene propylene elastomer (EPR) films containing elongated poly(3-alkylthiophene). This change is explained in terms of the formation of new torsioned bonds between thiophene rings on the main polymer chains. This interpretation is also consistent with th…
Thiolase (acetyl-coenzyme A [CoA] acetyltransferase, E.C. 2.3.1.19) from Clostridium acetobutylicum ATCC 824 has been purified 70-fold to homogeneity. Unlike the thiolase in Clostridium pasteurianum, this thiolase has high relative activity throughout the physiological range of internal pH of 5.5 to 7.0, indicating th…
We present a new scattering matrix formalism for the modeling of electromagnetic wave propagation in stratified media. It is computationally efficient and stable and is well suited to the layer geometry that is characteristic of stratified materials. It is applied successfully to the modeling of total attenuated refle…
Abstract A series of pure and mixed chromium standards has been analysed by x‐ray photoelectron spectroscopy in order to obtain a sufficiently homogeneous and self‐consistent set of spectral parameters to be used in the resolution of complex spectra. Additional information was obtained about the stability of the vario…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDihexadecyl phosphate, vesicle-stabilized and in situ generated mixed cadmium sulfide and zinc sulfide semiconductor particles: preparation and utilization for photosensitized charge separation and hydrogen generationHyeong Chan Youn, Subhash Baral, and Janos H. FendlerCite…
Abstract An aromatic, diether‐linked phthalonitrile resin, prepared from 4,4′‐bis(3,4‐dicyanophenoxy)biphenyl, exhibits excellent thermo‐oxidative properties. The resin is easily processed from the melt of the monomer in a controlled manner as a function of the amine curing agent and processing temperatures. Polymeriz…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility and decomposition kinetics of nitrous acid in aqueous solutionJong Yoon Park and Yin Nan LeeCite this: J. Phys. Chem. 1988, 92, 22, 6294–6302Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Published inissue 1 November 1988htt…
A newly described plant-derived flavonoid, hypolaetin-8-glucoside, which has anti-inflammatory and gastroprotective actions in-vivo, and its corresponding aglycone, hypolaetin, have been compared with 14 other flavonoids for inhibition of eicosanoid generation via the 5-lipoxygenase and cyclo-oxygenase pathways in eli…
The internal bias field which is observed in many ferroelectric materials is explained semiquantita-tively. Dipolar defects in the ferroelectric cause div P # O at the defect sites. The electric fields diverging at these sites tend to orient the dipoles to energetically favourable orientations. The free energy is modi…
A three-body potential suitable for molecular dynamics (MD) simulations has been developed for vitreous silica by adding three-body interactions to the Born–Mayer–Huggins (BMH) pair potential. Previous MD simulations with the BMH potential have formed glassy SiO2 through the melt-quench method with some success. Thoug…
Abstract The ir spectra of lathyritic rat skin collagen and calf skin gelatin solutions at a variety of temperatures were obtained using Fourier transform ir spectroscopy and a 9‐reflection, 2‐pass ZnSe prism sample cell. The spectra were then deconvolved (based on Kauppinnen's method) and the behavior of the amide I…
The three-dimensional structure of the alpha 2 beta 2 complex of tryptophan synthase from Salmonella typhimurium has been determined by x-ray crystallography at 2.5 A resolution. The four polypeptide chains are arranged nearly linearly in an alpha beta beta alpha order forming a complex 150 A long. The overall polypep…
Abstract The population balance for batch aggregation of particulate suspensions is recast in a form that may be solved simply and accurately. The transformed equation is deduced with the introduction of only one additional parameter, which is found to be a constant for all cases. The transformed equation is tested by…