Jan F. Rabek、Julia Lucki1988-08-20Journal of Polymer Science Part A Polymer Chemistry
Abstract Polystyrene was crosslinked in either 1,2‐dichloroethane or carbon tetrachloride in the presence of aluminum chloride. Apparently, the reactions involve Friedel–Crafts substitution of phenyl ring with CH 2 CH 2 Cl or CCl 3 groups, which than participate in crosslinking, giving CH 2 CH 2 or CCl 2 , CCl, and C…
Advanced Polymer Synthesis and Characterizationbiodegradable polymer synthesis and propertiesSynthesis and properties of polymers
G. P. Johari、Andreas Hallbrucker、Erwin Mayer1988-08-20Journal of Polymer Science Part B Polymer Physics
Abstract The glass transition temperature T g of propylene glycol (PG) and poly(propylene glycols) (PPGs) of molecular weight up to 4000 has been measured by differential scanning calorimetry, and the activation energy and change in heat capacity Δ C p have been determined in the glass transition range. The activation…
Material Dynamics and PropertiesThermodynamic properties of mixturesThermal and Kinetic Analysis
M. Day、T. Suprunchuk、J.D. Cooney 等 4 位作者1988-08-20Journal of Applied Polymer Science
Abstract Differential scanning calorimetry (DSC) has been used to study the crystallization kinetics and thermal characteristics of poly(aryl‐ether–ether‐ketone) (PEEK) samples heated under a variety of conditions. Samples were heated in nitrogen and air at temperatures between 380 and 420°C for times up to 120 min. T…
Polymer crystallization and propertiesbiodegradable polymer synthesis and propertiesSynthesis and properties of polymers
Francis M. Mirabella、Stanley P. Westphal、P. L. Fernando 等 5 位作者1988-08-20Journal of Polymer Science Part B Polymer Physics
Abstract The fracture toughness of commercial linear low‐density polyethylenes (LLDPE) has been found to be extraordinarily high relative to commercial low‐density (LDPE) and high‐density (HDPE) polyethylenes in previously reported investigations. The present investigation shows that this extraordinary fracture toughn…
Mechanical Behavior of CompositesPolymer crystallization and propertiesPolymer Nanocomposites and Properties
A.M. Hindeleh、R. Hosemann1988-08-20Journal of Physics C Solid State Physics
It has now been established that paracrystals are the 'building blocks' of many materials including polymers, biological materials, colloids, molten metals and alloys, and catalysts. The concept of paracrystallinity and the main equations which are needed for the practical application of the theory to X-ray, neutron a…
Material Dynamics and PropertiesThermal and Kinetic AnalysisX-ray Diffraction in Crystallography
Eric van Oort、Neil B. Manson、M. Glasbeek1988-08-20Journal of Physics C Solid State Physics
For the N-V centre in type Ib diamond the optical detection of spin coherence in the 3 A state is reported. The 3 A-state lifetime is studied as a function of the light intensity used for the optical excitation of the N-V centre by means of spin-locking experiments. The shortening of the lifetime at higher excitation…
Diamond and Carbon-based Materials ResearchForce Microscopy Techniques and ApplicationsAdvanced Fiber Laser Technologies
John C. Angus、C. Hayman1988-08-19OpenAlex
Diamond may be grown at low pressures where it is the metastable form of carbon. Recent advances in a wide variety of plasma and electrical discharge methods have led to dramatic increases in growth rates. All of these methods have certain aspects in common, namely, the presence of atomic hydrogen and the production o…
High-pressure geophysics and materialsDiamond and Carbon-based Materials ResearchForce Microscopy Techniques and Applications
B. Jassemnejad、R. Abbundi、M. D. Brown 等 4 位作者1988-08-16physica status solidi (a)
Luminescence measurements (photo-, X-ray-induced and thermo-), ionic thermocurrent and optical absorption data are presented on CaF2 doped with Ce and with Mn. The purpose of the study is to examine the processes of energy storage in this material following irradiation, and the subsequent release of this energy in the…
Luminescence Properties of Advanced MaterialsGlass properties and applicationsInorganic Fluorides and Related Compounds
Jinsong Zhu、R. Schaller、W. Benoît1988-08-16physica status solidi (a)
Low-frequency (≈︁ 1 Hz) internal friction associated with the martensitic transformation in NiTi, is systematically investigated under diverse heating and cooling rates T. The main contribution to the internal friction is due to transistory phenomena which decrease to zero with T. It is shown that the transitory inte…
Shape Memory Alloy TransformationsHigh Entropy Alloys StudiesMagnetic Properties and Applications
O. Eibl、P. Pongratz、P. Skalický 等 4 位作者1988-08-16physica status solidi (a)
Bulk dislocations in cubic and tetragonal BaTiO3 are analysed by TEM. Dislocations with Burgers vectors of the type b = a{100} lying along {010} directions are found in stoichiometric material whereas 72° dislocations are predominant in non stoichiometric material. Stacking faults (extended compositional defects in th…
Ferroelectric and Piezoelectric MaterialsUltrasonics and Acoustic Wave PropagationAcoustic Wave Resonator Technologies
Karsten Durst、H. Kronmüller、W. Ervens1988-08-16physica status solidi (a)
The magnetic hysteresis loops for sintered multiphase Sm(Co0.68Cu0.08–Fe0.22Zr0.02)7.6 permanent magnets are investigated in the whole ferromagnetic temperature range between 10 K and Tc=1070 K. The measured temperature and field dependence of the coercive field is analysed within the framework of theoretical results…
Magnetic properties of thin filmsMagnetic Properties and ApplicationsMagnetic Properties of Alloys
Shinya Uji、Hiroshi Nagasawa1988-08-15Journal of the Physical Society of Japan
The NMR and EPR measurements of a quasi-one-dimensional conductor β-Pb x V 2 O 5 ( x =0.18, 0.33, 0.37, 0.44) were carried out at temperatures between 12 K and 360 K. The evidence of a spin-singlet ground state was obtained from the temperature dependence of 51 V Knight shift for x =0.18. The observed spin susceptibil…
Transition Metal Oxide NanomaterialsAdvanced Condensed Matter PhysicsCatalysis and Oxidation Reactions
Kenji Komatsu、Kazuyuki Itoh、E. Nakamura1988-08-15Journal of the Physical Society of Japan
The polarization reversal process is investigated on the basis of the crystal structure accurately determined by X-ray structure analysis at 170°C in the paraelectric phase. It is concluded from the anisotropic character of the atomic thermal vibrations that polarization reversal is achieved by rotation of the NO 2 ra…
Acoustic Wave Resonator TechnologiesSpectroscopy and Quantum Chemical StudiesSolid-state spectroscopy and crystallography
P. Zeppenfeld、Klaus Kern、Rudolf David 等 4 位作者1988-08-15Physical review. B, Condensed matter
We present kinematical calculations of the diffraction patterns from domain-wall systems on a hexagonal substrate lattice. Diffraction-peak positions and intensities are calculated for the (\ensuremath{\surd}3\ifmmode\times\else\texttimes\fi{}\ensuremath{\surd}3)R30\ifmmode^\circ\else\textdegree\fi{} commensurate-to-i…
Advanced Chemical Physics StudiesAcoustic Wave Resonator TechnologiesSolid-state spectroscopy and crystallography
Subhasish Dutta Gupta、Deb Shankar Ray1988-08-15Physical review. B, Condensed matter
The transmission properties of a multilayered medium consisting of $N$ nonlinear slabs are studied. A general characteristic matrix formalism is applied to obtain the power dependence of the transmission coefficient. As an application, a nonlinear Fibonacci multilayer with as many as 55 and 233 nonlinear slabs is cons…
Liquid Crystal Research AdvancementsNonlinear Photonic SystemsNonlinear Optical Materials Studies
G. Tourillon、Y. Jugnet1988-08-15The Journal of Chemical Physics
The electronic and structural properties of electrochemically synthetized five poly membered heterocycles [polypyrrole (PP), poly-N-methylpyrrole (PNMeP), polythiophene (PT), polybithiophene (PBT), and poly-3-methylthiophene (PMeT)] in their doped conducting and undoped semiconducting states have been determined by x-…
Organic Electronics and PhotovoltaicsConducting polymers and applicationsElectrochemical Analysis and Applications
B. A. Scott、R. D. Estes、Joseph M. Jasinski1988-08-15The Journal of Chemical Physics
Monosilane pyrolysis has been studied by measuring the rate of silicon deposition from SiH4–Ar mixtures in a flow reactor at temperatures between 400–500 °C. By varying gas residence time, SiH4 partial pressure and total pressure, the process could be separated into experimental regimes dominated by either homogeneous…
Advanced ceramic materials synthesisCatalytic Processes in Materials ScienceSilicon Nanostructures and Photoluminescence
Shūichi Emura、Shun‐ichi Gonda、Yūichi Matsui 等 4 位作者1988-08-15Physical review. B, Condensed matter
Raman spectra of ${\mathrm{In}}_{\mathrm{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$As are observed over a wide range of composition. A GaAs-like mode frequency \ensuremath{\omega} is found to vary with the composition x as \ensuremath{\omega}=-32.4${x}^{2}$-18.6x+290.0 ${\mathrm{cm}}^{\mathrm{\ensuremath…
Silicon Nanostructures and PhotoluminescenceNanowire Synthesis and ApplicationsSemiconductor materials and interfaces
M. Kobayashi、Kenji Ishikawa、Fumio Tachibana 等 4 位作者1988-08-15Physical review. B, Condensed matter
A molecular-dynamics method is applied in a study of silver diffusion in superionic conductor ${\mathrm{Ag}}_{2}$Te for several temperatures with use of effective pairwise potentials. The static and dynamical structures are calculated. The density distribution map of silver ions suggests that a Ag ion, located at a te…
Material Dynamics and PropertiesTheoretical and Computational PhysicsPhase-change materials and chalcogenides
N. Toyota、T. Sasaki、Keizo Murata 等 10 位作者1988-08-15Journal of the Physical Society of Japan
The cyclotron mass m c and the Dingle temperature T D in the layered planes of the organic superconductors are determined by the Shubnikov-de Haas effect at ambient pressure; m c =0.4 m 0 and T D =7–8 K, for β-(BEDT-TTF) 2 IBr 2 ( T c =2 K), and (0.4–0.5) m 0 and 11 K for β-(BEDT-TTF) 2 I 3 (=1 K), and 3.5 m 0 and (0.…
Organometallic Complex Synthesis and CatalysisOrganic and Molecular Conductors ResearchOrganometallic Compounds Synthesis and Characterization