Materials Literature
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We investigated the order−order transition (OOT) and the order−disorder transition (ODT) in a polystyrene- block -polyisoprene- block -polystyrene copolymer (Vector 4111, Dexco Polymers Co.), which has a weight-average molecular weight of 1.4 × 10 5 and a 0.183 weight fraction of polystyrene (PS) blocks, using small-a…
An approximate closed-form expression for the loss in a planar phase grating is derived by using coupled-mode theory. It is shown that this loss expression can be used to determine the spectral and angular width of a resonant-grating filter. A resonant-grating filter is a free-space optic that takes advantage of grati…
ABSTRACT Glycerol‐plasticized soy protein films were cast from alkaline aqueous film‐forming solutions of laboratory‐prepared 7S, 11S, and soy isolate (LSI) fractions and from commercial soy isolate (CSI). Tensile strength (TS), elongation at break (E), water vapor permeability (WVP), total soluble matter (TSM), prote…
Phthalocyanine‐based nonlinear optical (NLO) materials are reviewed, with particular emphasis on second‐order effects. The requirements on materials and molecules for NLO activity are outlined before three recently studied families are briefly considered: asymmetrically substituted phthalocyanines (Pcs), subphthalocya…
Poly(ethylene terephthalate) substrates were coated with thin films of silicon oxide deposited by magnetically enhanced chemical vapor deposition. The rates of oxygen and water vapor transport through the coated and uncoated film systems were obtained as a function of temperature. Activated rate theory treatment of ox…
Spontaneous sequential adsorption of poly(allylamine hydrochloride) and poly(sodium styrene sulfonate) (layer-by-layer deposition) onto surface-oxidized poly(4-methyl-1-pentene) film was studied with the objective of creating an asymmetric gas separation membrane consisting of a thin multilayer barrier layer on a more…
One-dimensional and two-dimensional solids consisting of polyoxoanions bridged by (M(LL)2)2+ groups have been synthesized by hydrothermal methods and structurally characterized by X-ray crystallography.
Methanolysis of { t -Bu 2 In[μ-P(SiMe 3 ) 2 ]} 2 ( 1 ) in aromatic solvents gives polycrystalline InP fibers (dimensions 10−100 nm × 50−1000 nm) at 111−203 °C. The chemical pathway consists of a molecular component, in which precursor substituents are eliminated, and a nonmolecular component, in which the InP crystal…
A small amount of locally reversible melting and crystallization in poly(ethylene terephthalate) (PET) has been detected by temperature-modulated differential scanning calorimetry (TMDSC). Extended-time TMDSC was used in the quasi-isothermal mode. Studied were melt-crystallized, quenched, and a biaxially-oriented film…
Over the past decade, developments in molecular biology, X-ray diffraction and nuclear magnetic resonance (NMR) instrumentation, and computational methods have allowed nearly exponential growth of macromolecular structural studies. The analysis of data from these studies generally requires sophisticated computational…
A kinetic theory of glasses is developed using equilibrium theory as a foundation. After establishing basic criteria for glass formation and the capability of the equilibrium entropy theory to describe the equilibrium aspects of glass formation, a minimal model for the glass kinetics is proposed. Our kinetic model is…
Dynamical simulations of bulk sedimentation have been carried out, using up to 32 000 solid particles. There is no evidence that the long-range hydrodynamic interactions are screened by changes in the pair correlation function at large distances. Instead the velocity fluctuations and diffusion coefficients diverge lin…
We present new experimental data and molecular simulation results for the adsorption of nitrogen in MCM-41. We show that models in which the solid−fluid interaction potential is homogeneous cannot reproduce the form of the adsorption isotherm, particularly at low pressures. A new heterogeneous interaction model is sho…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCatalytic Asymmetric Epoxidation of α,β-Unsaturated Ketones Promoted by Lanthanoid ComplexesMasahiro Bougauchi, Shizue Watanabe, Takayoshi Arai, Hiroaki Sasai, and Masakatsu ShibasakiView Author Information Faculty of Pharmaceutical Sciences, University of Tokyo Hongo,…
Nowadays, the methodology existing to measure the shrinkage in air, developed for paste and cement mortars, has serious problems to be applied to lime mortars, due to its different mechanism of hardening several modifications in Norms UNE 80-113-86 y 80-112-89 make possible the determination of the shrinkage in these…
Rendering mortars, which are still exposed to the open air on some of the walls of Medina Azahara, are studied and characterized in this work. Some repairing mortars used in different previous restorations are also characterized. Those rendering mortars are of different make considering the composition of their binder…