Materials Literature
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Abstract Thermoplastic poly(glycerol sebacate) (TMPGS) elastomers originating from three prepolymers with different molecular weights were prepared first, and then the structure and properties were studied. Specifically, by swelling tests, gel permeation chromatography, X‐ray diffraction, and differential scanning cal…
A path of polymer crystallization has recently been proposed by Strobl by which lamellae are first formed in a mesophase, which then convert to the crystal form with a nanoscale granular or blocklike structure. The crystallization temperature dependence of the lamellar thickness was argued to imply a transient mesopha…
Abstract Octene (OC) and tetradecene (TD) monomers were copolymerized with maleic anhydride (MA) with a low conversion (<10% conversion) to determine their reactivity ratios. The monomers were copolymerized with different molar percentages of MA and OC or TD (90/10, 70/30, 50/50, and 10/90) with benzoyl peroxide as…
Sorption and capillary condensation of an organic fluid in ordered mesoporous silica were studied by in situ small-angle X-ray diffraction using synchrotron radiation. The sorption isotherm was calculated from the sample transmission data. The diffraction peaks resulting from the periodic hexagonal arrangement of the…
Upconversion emission properties of Na 1/2 Bi 1/2 TiO 3 :Er 3+ ceramics prepared by the solid‐state reaction method were analyzed as a function of Er 3+ concentration and incident pump power. Strong green (550 nm) and red (670 nm) emission bands were observed with 980 nm excitation at room temperature. Experimental re…
The evolution of the gap of a nanoscaled insulator material, namely, Gd(2)O(3), has been observed by means of vacuum ultraviolet excitation spectra of a dopant (Eu(3+)). The nanoparticles have been synthesized by the low energy cluster beam deposition technique and grown afterward by different annealing steps. A gap s…
We have measured the thickness of the pre-molten surface layer that appears at the interface of octamethylcyclotetrasiloxane (OMCTS) to the matrix in controlled pore glasses with pore diameters ranging 7.5-73 nm. Except for the glass with the largest pores, the layer thickness data for different pore diameters fall on…
Abstract A single phase formation of PFW (Pb(Fe 2/3 W 1/3 )O 3 )–BFO (BiFeO 3 ) composites prepared by mechanical activation, followed by mixed oxide method was checked by an X‐ray diffraction technique. Detailed studies of the impedance parameters suggest that addition of small amount of multiferroic BFO (10%) in PFW…
We unequivocally verified a success of creating “voided double-gyroid-channel” morphology and identified for the first time its cleavage planes inherent in the morphology on the basis of computer analysis of field-emission scanning electron microscope (FE-SEM) images. This morphology was created by transforming the mi…
The molecular structure of Bombyx mori silkworm silk fibers is investigated in situ upon externally applied tensile stress using synchrotron X-ray diffraction, while the molecular vibrational response is investigated using cold neutron time-of-flight spectroscopy. The aligned silk fibers are therefore exposed to a ten…
Abstract A novel polytriazole resin prepared from p ‐xylylene diazide (XDA) and N,N,N′,N′ ‐tetrapropargyl‐ p,p′ ‐diaminodiphenylmethane (TPDDM) was synthesized and characterized. The resin is soluble in common solvents like acetone. The results show that the polytriazole resin can be cured at 70°C. The glass transitio…
The main reaction routes that lead to the formation of structural defects in PVC are studied on a theoretical basis with the BMK/6-311+G(3df,2p)//B3LYP/6-31+G(d) method. All studied reactions can be classified into four classes: the reactions following a head-to-head addition, intramolecular H-transfer (backbiting), a…
The wages of spin: Insight into the elusive structure of [V(TCNE)x]-based magnets is provided by the structural analysis of the title compound (Tc≈100 K; TCNE=tetracyanoethylene; z≈0.3), in which {FeII(μ4-[TCNE]).−} layers are bridged by diamagnetic TCNE dimers μ4-[C4(CN)8]2− (see picture; Fe gold; C black; N blue). S…
Abstract Linseed oil based polyesteramide was synthesized at lower temperature in the absence of organic solvent through condensation polymerization reaction [Sf‐LPEA]. In this reaction N , N ‐bis(2‐hydroxyethyl) linseed oil fatty amide and phthalic anhydride were heated at temperature lower than their onset of meltin…
The results reported highlight the great potential of the use of size-tunable preformed AuNPs for the preparation of active catalysts. The use of preformed metal clusters and the mild reaction conditions are not favorable to the formation of ionic Au species. The experimental results suggest that the catalytic sites f…
Growth and property studies of a new nonlinear optical (NLO) metal−organic crystal, bis thiourea bismuth chloride (BTBC), is reported. BTBC crystals were grown from aqueous solution by a slow-cooling technique. It has been observed that the solution pH influences the growth rate along the [001] and [010] directions. T…
The swelling dynamics of the ultrathin polyacrylamide (PAM) spin-coated films in saturated vapor of D 2 O and H 2 O were studied using neutron and X-ray reflectivity. A uniform scattering length density (SLD) profile represents the dry PAM films, whereas the SLD profiles corresponding to the swelled films were charact…
Reactions between K[TpFe(CN)3] (Tp- = hydrotris(1-pyrazolyl)borate) and M(ClO4)2 x 6H2O (M = Co or Ni) in a mixture of acetonitrile and methanol afford, upon crystallization via THF vapor diffusion, [Tp8(H2O)12Co6Fe8(CN)24](ClO4)4.12THF x 7H2O (1) and [Tp8(H2O)12Ni6Fe8(CN)24](ClO4)4.12THF x 7H2O (2). Both compounds co…
Abstract Rodlike samples were made from four kinds of poly(ethylene‐ co ‐vinyl alcohol) (EVAL) pellets with different ethylene contents. From these rodlike samples, fibers were produced using a melt‐electrospinning system equipped with a CO 2 ‐laser melting device. The effects on the fiber diameter of the ethylene con…
Abstract This article investigates the effects of nanoparticles on cell morphology and foam expansion in the extrusion foaming of metallocene polyethylene/wood fiber nanocomposites with a chemical blowing agent. The results indicate that the addition of clay generally reduces the cell size, increases the cell density,…