Materials Literature
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The mechanical relaxation behavior and microstructure of a series of novel norbornyl−POSS organic−inorganic copolymers have been investigated. We have examined the influence on physical properties of both the weight fraction of POSS−norbornyl monomer and the corner group composition. POSS refers to the polyhedral olig…
Anisotropic strain broadening in X-ray line profile analysis means that the width of diffraction profiles of Bragg reflections is not a monotonous function of the diffraction angle. The lack of a physically sound model makes the interpretation of line broadening and the structure refinement procedure of Rietveld often…
Abstract The objective of this research was to show the reinforcing effects of nanofibers in an epoxy matrix and in a rubber matrix using electrospun nanofibers of PBI (polybenzimidazole). The average diameter of the electrospun fibers was around 300 nanometers, which is less than one tenth the diameter and 1/100 the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Stable Neutral Hydrocarbon Radical: Synthesis, Crystal Structure, and Physical Properties of 2,5,8-Tri-tert-butyl-phenalenylKosaburo Goto, Takashi Kubo, Kagetoshi Yamamoto, Kazuhiro Nakasuji, Kazunobu Sato, Daisuke Shiomi, Takeji Takui, Mari Kubota, Tunetoshi Kobayas…
Multiwalled carbon nanotubes (MWNTs) have unique mechanical properties and are ideal candidates for high-performance composites. Elastic measurements, performed with an atomic force microscope, are described for MWNTs produced by two methods: the arc-discharge method and the thermal decomposition of hydrocarbons in th…
We have investigated the electronic structures of n - or p -type doped ZnO based on ab initio electronic band structure calculations. We find unipolarity in ZnO; n -type doping using Al, Ga or In species decreases the Madelung energy while p -type doping using N species increases the Madelung energy, in addition to ca…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTIntercalative Nanohybrids of Nucleoside Monophosphates and DNA in Layered Metal HydroxideJin-Ho Choy, Seo-Young Kwak, Jong-Sang Park, Yong-Joo Jeong, and Josik PortierView Author Information Department of Chemistry, Center of Molecular Catalysis Seoul National Universi…
Ferrites—ceramic ferromagnetic materials—have been considered as highly important electronic materials for more than half a century. During this time, the characteristics of commercial ferrite materials, both soft and hard ferrites, have come to approach theoretical values. The quality of commercial ferrites has been…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation A. N. Bogdanov; Magnetic Domains. The Analysis of Magnetic Microstructures. Low Temp. Phys. 1 Feb…
Carbon nanotubes are believed to be the ultimate low-density high-modulus fibers, which makes their characterization at nanometer scale vital for applications. By using an atomic force microscope and a special substrate, the elastic and shear moduli of individual single-walled nanotube (SWNT) ropes were measured to be…
We demonstrate an approach to the development of many-body interatomic potentials for monoatomic metals with improved accuracy and reliability. The functional form of the potentials is that of the embedded-atom method, but the interesting features are as follows: (1) The database used for the development of a potentia…
A set of general guidelines for structure refinement using the Rietveld (whole-profile) method has been formulated by the International Union of Crystallography Commission on Powder Diffraction. The practical rather than the theoretical aspects of each step in a typical Rietveld refinement are discussed with a view to…
Block copolymers are all around us, found in such products as upholstery foam, adhesive tape and asphalt additives. This class of macromolecules is produced by joining two or more chemically distinct polymer blocks, each a linear series of identical monomers, that may be thermodynamically incompatible (like oil and vi…
SIR 97 is the integration of two programs, SIR 92 and CAOS , the first devoted to the solution of crystal structures by direct methods, the second to refinement via least-squares–Fourier procedures. Several new features have been introduced in SIR 97 with respect to the previous version, SIR 92: greater automatization…
Stress oscillations were produced and analyzed in partly-crystalline syndiotactic polypropylene (sPP) and in poly(ethyleneterephthalate) (PET) in cold drawing experiments. Strain oscillations, which always occur in connection with stress oscillations, were also investigated. The experiments were performed varying the…
Living polytetrahydrofuran (pTHF) was terminated with the potassium salt of pyrrole to yield polymers with pyrrole end groups. Copolymerization of THF and pyrrole with short and long pTHF segments was achieved by constant potential electrolysis. Syntheses of the block copolymers were performed using tetrabutylammonium…
Jute yarns soaked for 30 min in 2-hydroxyethylmethacrylate (HEMA) + MeOH solutions at different proportions [1–20% HEMA in MeOH (v/v)] were irradiated in situ with a UV lamp for different periods. The treated jute yarns that were washed in acetone after the irradiation to remove the unused excess monomer HEMA gained a…
This article reports the toughness improvement of high-density polyethylene (HDPE) by low-density polyethylene (LDPE) in oscillating packing injection molding, whereas tensile strength and modulus are greatly enhanced by oscillating packing at the same time. Compared with self-reinforced pure HDPE, the tensile strengt…
The incorporation of 2.2 mol % sodium sulfonate groups along the backbone of syndiotactic polystyrene dramatically inhibits crystallization from the melt. However, small amounts of a surfactant, such as sodium dodecylbenzenesulfonate (DBSNa), may be used to selectively plasticize the ionic domains of sulfonated polyst…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTAnalysis of an Interface between an Immiscible Polymer Pair by Electron Spectroscopic ImagingShin Horiuchi, Takeshi Hanada, Kiyoshi Yase, and Toshiaki OugizawaView Author Information National Institute of Materials and Chemical Rese…