Materials Literature
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A facile, single-step transesterification approach to poly(lactides) with controlled molecular weights and end-group functionality, as well as block and star-shaped architectures is described using nucleophilic amine catalysts.
Modification of polypropylene by hyperbranched grafting with a poly(acrylic acid) graft was carried out using techniques previously used with gold, aluminum, silicon, and polyethylene surfaces. An initial etching oxidation produced a modified polypropylene that was presumed to contain carboxylic acid functional groups…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTA New C−F Bond-Cleavage Route for the Synthesis of Octafluoro[2.2]paracyclophaneHideki Amii, Yasushi Hatamoto, Motoharu Seo, and Kenji UneyamaView Author Information Department of Applied Chemistry, Faculty of Engineering, Okayama University 3-1-1 Tsushimanaka, Okayama 700-8530…
The syntheses of trans -[Ru(C CHR)Cl(pp) 2 ]PF 6 (pp = dppm, R = 4-C 6 H 4 C⋮CPh, 4-C 6 H 4 CHO, 4,4‘-C 6 H 4 C⋮CC 6 H 4 NO 2, ( E )-4,4‘-C 6 H 4 CH CHC 6 H 4 NO 2, 4,4‘,4‘ ‘-C⋮CC 6 H 4 C⋮CC 6 H 4 C⋮CC 6 H 4 NO 2; pp = dppe, R = 4-C 6 H 4 CHO, ( E )-4,4‘-C 6 H 4 CH CHC 6 H 4 NO 2 ) and trans -[Ru(C⋮CR)Cl(pp) 2 ] (pp =…
We report viscosity and compressibility measurements of trehalose, maltose, and sucrose aqueous solutions at different concentration and temperature values. What emerges from the concentration dependence of viscosity and compressibility is that trehalose, in comparison to maltose and sucrose, shows a higher interactio…
Influence of disorder on the ferromagnetic phase transition in diluted (III,Mn)V semiconductors is investigated analytically. The regime of small disorder is addressed, and the enhancement of the critical temperature by disorder is found both in the mean field approximation and from the analysis of the zero temperatur…
Many glass-forming substances display heat capacities for their supercooled liquids that substantially exceed those of the corresponding crystals. Reasonable extrapolation below the kinetic glass transition temperature indicates that the molar entropies of the supercooled liquid and crystal phases would become equal a…
The ligand 2-mercapto-3,5-di-tert-butylaniline, H[L(AP)], an o-aminothiophenol, reacts with metal(II) salts of Ni and Pd in CH3CN or C2H5OH in the presence of NEt3 under strictly anaerobic conditions with formation of beige to yellow cis-[M(II)(L(AP))2] (M = Ni (1), Pd (2)) where (L(AP))1- represents the o-aminothioph…
The Nobel Prize in Chemistry 2000 was awarded for our discovery and development of conducting polymers, but that discovery only happened after much work on polyacetylene. In this lecture, I would like to talk about the early investigations that preceded and eventually led to the discovery of chemical doping. I do hope…
We study the effect of fluid flow on three-dimensional (3D) dendrite growth using a phase-field model on an adaptive finite-element grid. In order to simulate 3D fluid flow, we use an averaging method for the flow problem coupled to the phase-field method and the semi-implicit approximated projection method (SIAPM). W…
The present paper describes the synthesis and characterization of nanocomposite materials built from the assembly of organic polymers and two-dimensional host materials, particularly reviewing those composed of layered double hydroxide (LDH) inorganic frameworks. When the meaning commonly adopted for nanocomposites is…
together with a talented group of graduate students and postdoctoral researchers, discovered conducting polymers and the ability to dope these polymers over the full
Abstract In addition to round nanofibers, electrospinning a polymer solution can produce thin fibers with a variety of cross‐sectional shapes. Branched fibers, flat ribbons, ribbons with other shapes, and fibers that were split longitudinally from larger fibers were observed. The transverse dimensions of these asymmet…
The ability of the regolith to adsorb and retard radioactive and other noxious chemicals is important when selecting repository sites. Because of its surface charge and great specific surface, the clay in soil contributes significantly to this retardation. This paper illustrates a novel analysis of unsteady water and…
A new method for quantitatively evaluating the alignment degree of sintered Nd-Fe-B magnets by x-ray diffraction spectra has been proposed. It has been experimentally revealed that the strong (105) reflection existing in almost all x-ray diffraction spectra of sintered Nd-Fe-B magnets stems from the misalignment grain…
Abstract Calcium‐carbonate‐filled linear low‐density polyethylene (LLDPE) films play an important role in the hygienics market because these materials allow for the diffusion of water vapor (breathability) and retain a liquid barrier while providing a barrier to liquids. This is achieved when properly formulated compo…
Fatty acids and polyketides are synthesized by mechanistically and evolutionarily related multienzyme systems. Their carbon chain backbones are synthesized via repeated decarboxylative condensations of alpha-carboxylated building blocks onto a growing acyl chain. These alpha-carboxylated building blocks are transferre…
The impact of land use change from grassland to conifer forest on the aluminium (Al) concentrations in soils and soil solutions was examined. Soils from grassland were compared with those from adjoining 15–19-year old forest stands at 3 contrasting pairs of sites in South Island, New Zealand. The site pairs were on a…
Abstract Values of the effective interaction parameter (χ) between regular, long‐branched polystyrene chains and their linear analogues were measured with small‐angle neutron scattering for several star‐branched chains and one comb‐type polymer. The contribution to this interaction due to architecture alone increases…
This review is devoted to hybrid materials made of organic quadratic nonlinear optical (NLO) chromophores embodied in various inorganic environments. In the first section are reported systems in which the inorganic moiety is a transparent mineral network (e.g., silica, zirconium phosphate, etc.) exhibiting good transp…