Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract Polypropylene (PP), as a commodity recyclable thermoplastic, was studied in this research to evaluate the potential environmental impact resulting from volatile organic compounds (VOCs) emitted during multiple melt reprocessing. Unstabilized PP (U‐PP) and stabilized PP (S‐PP) resins, simulating recycled mater…
Abstract Postconsumer recycled polypropylene, filled with 15% CaCO 3 was restabilized at various degrees utilizing different processing stabilizers, one of which is especially prepared to counter the deactivating effects of fillers and other moieties. The polymer was then subjected to multiple extrusion cycles for the…
Abstract Plastic energy dissipation (PED) of individual polymer pellets as well as of densified polymer particulate assemblies may be the dominant heating/melting mechanisms in intermeshing corotating twin‐screw extruders (Co‐TSEs). In the present paper, the amount of PED is evaluated by conducting the uniaxial unconf…
Thermal oxidation of metallic Ge yields patterned nanowires of α-GeO2. A significant proportion (∼50 %) of the nanowires possess a common wire morphology with a uniform structure, while some of them have distinctive patterned structures consisting of either a regular array of Ge dots or penetrating holes along their a…
Abstract A novel water‐diluted hybrid coating, consisting of fluorinated poly(urethane‐acrylate) (PUA) and colloidal silica, was prepared by introducing a small amount of fluorinated methacrylate units into the PUA chains. The surface composition and surface morphology of the hybrid film were studied extensively. Atte…
Abstract The screw profile of a twin‐screw extruder can be designed to contain kneading and conveying elements inducing different levels of degradation in the polymer melt. In this work, the level of degradation in polypropylene has been measured after multiple extrusions—for various screw profiles—using size exclusio…
Molecular orientation and relaxation of the trans and gauche conformers of poly(ethylene terephthalate), during and after an uniaxial deformation above the glass transition temperature, between 85 and 100 °C, were investigated using polarization modulation infrared linear dichroism. At all temperatures, it was found t…
The iron complexes of 5,10,15,20-tetraphenyl-21-oxaporphyrin (OTPP)H have been investigated. Insertion of iron(II) followed by one-electron oxidation yielded a high-spin, six-coordinate (OTPP)Fe(III)Cl(2) complex. The reduction of (OTPP)Fe(III)Cl(2) has been accomplished by means of moderate reducing reagents producin…
Two copper-mercury-chalcogenide clusters [Hg(15)Cu(20)E(25)(PPr(3))(18)] (1, E = S; 2, E = Se) are synthesized in good yield from the reaction of (Pr(3)P)(3)Cu-ESiMe(3) and (Pr(3)P)(2).Hg(OAc)(2) at low temperatures. Single-crystal X-ray analyses illustrate that the two ternary clusters are isomorphous and consist of…
Aligned and diameter-controlled one-dimensional nickel–carbon nanotubes and Ag–Si heterojunctions (see Figure) have been synthesized by a novel combination of electrochemical deposition and chemical vapor deposition with anodic aluminum oxide templates. No external catalysts are introduced in the chemical reactions. I…
Two types of carbon materials, i.e., nanocapsules and mesocellular foams, have been selectively synthesized by combining surface-modified colloidal silica templating and microemulsion polymerization. Carbon nanocapsules (see Figure) of 30 nm diameter, and mesocellular carbon foams with an average pore diameter of 22 n…
A low-ϰ organic–inorganic hybrid material (see Figure) based on functionalized silsesquioxanes is demonstrated. The preparation is based on platinum-catalyzed hydrosilylation or hydrolytic condensation of functionalized silsesquioxanes, and by controlling the parameters for spin coating, by which the hybrid copolymer…
Abstract Poly(benzobisthiazole)s containing tetrafluorophenyl and bromophenyl moieties were synthesized via the polycondensation of 2,5‐diamino‐1,4‐benzenedithiol dihydrochloride with tetrafluorophthalic acid and 4‐bromoisophthalic acid under a nitrogen atmosphere. The polymers were characterized by X‐ray diffraction,…
Abstract Biodegradable polyurethane foams (PUFs) as coating materials for the controlled release of fertilizer were prepared from a four‐component system consisting of diisocyanate, polyester, Acacia mearnsi bark, and corn starch. Ammonium sulfate [(NH 4 ) 2 SO 4 ] was used as a fertilizer to evaluate the effects of t…
We consider chirality related effects in optical, photogalvanic, and electron-transport properties of carbon nanotubes. We show that these properties of chiral nanotubes are determined by terms in the electron effective Hamiltonian describing the coupling between the electron wave vector along the tube principal axis…
A single-step hydrolytic decomposition of a mixed-metal precursor (see Figure) results in the size-controlled synthesis of nanocrystalline GdFeO3 particles with high compositional and morphological homogeneity. Owing to the molecular level mixing of the cations and the preformed Gd–O–Fe linkage, the temperature requir…
The solubilization of oxidized carbon nanotubes has been achieved through derivatization using a functionalized organic crown ether. The resultant synthesized adduct yielded concentrations of dissolved nanotubes on the order of ∼1 g/L in water as well as in methanol, according to optical measurements. The nanotube−cro…
BTP (2,2′-bistriphenylenyl) emits very strong blue light in the solid state and in solution and shows excellent physical properties, such as a very good thermal stability and a high melting point. Electroluminescent devices using BTP as the blue emitter show high brightness, good external quantum and current efficienc…
Field emission properties of B-doped carbon nanotubes are investigated from both theoretical and experimental standpoints. Using tight-binding and ab initio calculations, it is observed that B-saturating tip edges of carbon nanotubes induce the presence of large peaks within the local density of states (LDOS) located…
We report muon spin rotation measurements of the local magnetic susceptibility around a positive muon in the paramagnetic state of the quasi one-dimensional spin 1/2 antiferromagnet KCuF$_3$. Signals from two distinct sites are resolved which have a temperature dependent frequency shift which is different than the mag…