Materials Literature
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Abstract Summary: Solution‐grown lamellar crystals of poly( p ‐dioxanone) (PPDX) have been crystallized isothermally from butane‐1,4‐diol at 100 °C. The crystal structure of PPDX has been determined by interpretation of X‐ray fiber diagrams of PPDX fibers and electron diffraction diagrams of lozenge‐shaped chain‐folde…
Abstract The formation of two novel phenoxo‐bridged linear trimetallic Cu II and Ni II complexes, [Cu 3 (μ‐ L ) 2 ](CH 3 OH) 2 (ClO 4 ) 2 ( 1 ) and [Ni 3 (μ‐ L ) 2 (CH 3 OH) 2 ](ClO 4 ) 2 ( 2 ), with a new diazamesocyclic ligand functionalised by additional phenol donor pendants (H 2 L = N , N′ ‐ bis(2‐hydroxybenzyl)‐…
Abstract Differential scanning calorimeter (DSC) and X‐ray diffraction methods were used to investigate the isothermal and nonisothermal crystallization behavior and crystalline structure of syndiotactic polystyrene (sPS)/clay nanocomposites. The sPS/clay nanocomposites were prepared by mixing the sPS polymer solution…
Abstract The extrusion (single‐screw) characteristics of four high‐molecular‐weight, broad‐molecular‐weight‐distribution (MWD) polyethylene resins are discussed with an emphasis on the output rate. Despite the high molecular weights of the subject polyethylenes, their broad MWD ( M w / M n range: 10 to 50) does not li…
Abstract An in‐situ microfibrillar blend based on poly(ethylene terephthalate) (PET) and polyethylene (PE) was fabricated through slit die extrusion, hot stretching, and quenching. The morphological characteristics of the PET phase, such as diameter and its distribution, which were observed after the matrix was etched…
The syntheses of original acrylic monomers containing vinylidene fluoride (VDF) units, prepared through a four-step process starting from the telomerization of VDF with iodotrifluoromethane, are presented. By modifying the [CF 3 I] 0 /[VDF] 0 initial molar ratios, different CF 3 (VDF) n I telomers of various molecular…
A new post-grafting process, consisting of two steps of substrate preparation and sol–gel post-grafting, has been developed to prepare titanium-doped mesoporous SBA-15 material with a double-layered structure and locally concentrated titanium content at the inner pore surface. With this novel technique, the single pha…
Abstract The effective diffusion coefficients of novel, environmentally friendly, hydrofluorocarbon (HFC) blowing agents for polyurethane foam production were measured. The method was based on gas chromatography and infrared spectroscopy measurements. The accuracy and reliability of the procedure developed were confir…
Here we report a novel approach to fabricating patterned three-dimensional (3D) mesoporous thin films by spin coating a surfactant-templated SiO 2 or TiO 2 precursor solution onto electron-beam (EB) lithographically prepared resist moulds. Subsequent mechanical polishing and calcination led to patterned SiO 2 or TiO 2…
Abstract Erucamide is incorporated into polymer films to reduce their coefficient of friction (COF). At elevated temperatures, erucamide may be lost from the film surface to the surroundings, undergo chemical change or decomposition, and/or migrate back into the film. The major objective of this work was to investigat…
Abstract A mathematical formulation and numerical simulation for non‐isothermal cell growth during the post‐filling stage of microcellular injection molding have been developed. The numerical implementation solves the energy equation, the continuity equation, and a group of equations that describe the mass diffusion o…
Abstract This work reports on the relationships between processing, the morphology and the mechanical properties of an injection molded poly(ethylene terephthalate), PET. Specimens were injection molded with different mold temperatures of 30°C, 50°C, 80°C, 100°C, 120°C, 150°C, while maintaining constant the other oper…
Based on experimental crystallographic and magnetic results on the family of hydrides $\mathrm{Y}{\mathrm{Fe}}_{2}{\mathrm{H}}_{x}$ $(0<x\ensuremath{\leqslant}5)$ which point to a loss of magnetization for high H content, an assessment of the electronic, magnetic, and chemical bonding properties is provided within…
Double perovskites are of interest due to their diverse properties that are of potential use in technological applications. In order to determine the effect of Co(II) in the double perovskite structure in the absence of other paramagnetic species, mixed valency or mis-site disorder, we have studied the ordered perovsk…
Nanocrystalline lead zirconate titanate (PZT) powder with an average particle size between 70 and 110 nm was synthesized using the citrate nitrate (C/N) autocombustion method. Phase-pure perovskite PZT nanoparticles were characterized by XRD, BET surface area, DSC/TGA, and TEM analysis. The crystallite size of the PZT…
A gallium phthalocyanine dimer with a direct gallium–gallium bond, [tBu4PcGa]2·2dioxane (2), has been synthesized and characterized by Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy, UV/Vis, IR, NMR and MALDI-MS. By EXAFS the gallium–gallium distance in 2 was found to be 2.46 Å. Dimer 2 exhibits reverse…
We report a cumulative study of lithium oxide in its normal as well as superionic phase using both lattice dynamical and molecular dynamical calculations. Molecular dynamics simulations have been carried out to study the fast ion phase and the diffusion behavior of lithium and oxygen ions. The results obtained for the…
Polypropylene nonwoven fabric was surface-activated by high-density oxygen microwave plasma, followed by graft copolymerization with acrylic acid (AAc) and then coupling with chitosan molecules. The pAAc-grafted surface containing C=O in carboxylic acid exhibited a hydrophilic character capable of promoting water abso…
Mit bloßem Auge lässt sich die Farbänderung erkennen, die in einer Polymermatrix auftritt, wenn das gezeigte bistabile Rotaxan zwischen den für den Grundzustand (grün) und den metastabilen Zustand (rot) stehenden Cokonformeren wechselt. Damit ist nicht nur eine elektrochrome Baueinheit in Reichweite, sondern es schein…
Abstract Coalescence of droplets in flow through capillary dies and in the filling of strip molds was investigated using experiments and time‐scale analysis. The time scales of droplet approach, droplet‐droplet interactions, and fluid drainage were compared with the time scales of flow in order to predict the extent o…