Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater soluble conducting polymersA. O. Patil, Y. Ikenoue, Fred Wudl, and A. J. HeegerCite this: J. Am. Chem. Soc. 1987, 109, 6, 1858–1859Publication Date (Print):March 1, 1987Publication History Published online1 May 2002Published inissue 1 March 1987https://pubs.acs.org/doi…
This major eight-volume reference work provides the first unified treatment of an important interdisciplinary field.
Abstract Melt blending of a variety of conventional isotropic polymers (both crystalline and amorphous) has shown that considerable reinforcement is obtained from the inclusion of thermotropic liquid crystalline polymers (LCP). When the LCP is a minor component it forms highly elongated domains parallel to the flow di…
Abstract The formation of dispersed phase in blends of incompatible polymers during melt extrusion with a co‐rotating twin screw extruder was studied, using nylon and polyester as the matrix and ethylene‐propylene rubbers as the dispersed phase. A master curve is obtained, i.e., G η m α/γ = 4 p ±0.84 , where G is the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRothemund and Adler-Longo reactions revisited: synthesis of tetraphenylporphyrins under equilibrium conditionsJonathan S. Lindsey, Irwin C. Schreiman, Henry C. Hsu, Patrick C. Kearney, and Anne M. MarguerettazCite this: J. Org. Chem. 1987, 52, 5, 827–836Publication Date (Pri…
An improved description of copper- and iron-cylinder impact (Taylor) test results has been obtained through the use of dislocation-mechanics-based constitutive relations in the Lagrangian material dynamics computer program EPIC-2. The effects of strain hardening, strain-rate hardening, and thermal softening based on t…
Absolute measurements of the total cross section for electron scattering on H 2 O molecules are presented. The energy range extends from 81 to 3000 eV. A comparison with previous experimental data is given.
The results of studies on the structure and nature of the electronic states of spiropyrans (SP) and the products of their photochromic reactions as well as the mechanism of the dissociation of the Cspiro–O bond and the formation of a coloured form of the SP are surveyed and analysed. Also analysed are the mechanisms o…
Model calculations were performed to test the possibility of solving crystal structures of proteins by Patterson search techniques with three-dimensional structures obtained from nuclear magnetic resonance (NMR) interproton distance restraints. Structures for crambin obtained from simulated NMR data were used as the t…
A brief historical perspective and a review of the current research on amorphous or glassy materials are presented. Glass formation by natural processes and by laboratory synthesis techniques is described. Recent efforts to characterize and model the atomic scale structure of amorphous phases are surveyed. The relatio…
A novel foam structure is presented, which exhibits a negative Poisson's ratio. Such a material expands laterally when stretched, in contrast to ordinary materials.
The differential resistance of ${\mathrm{NbSe}}_{3}$ measured in the presence of combined ac and dc electric fields exhibits interference features. Our experimental results for the dependence of these features on ac amplitude and frequency are in complete and dramatic disagreement with predictions of the classical mod…
Mercury photosensitized decomposition of SiH4 is used to study surface reactions of SiH3 on hydrogenated amorphous silicon (a-Si:H). The method involves modeling of gas phase production, reaction and diffusion to the walls of reactive species, in a parallel plate reactor, combined with measurements of surface reflecti…
From a simple master-equation description of viscous liquids it is shown that there exist two different kinds of glass transitions. Slow glass transitions lead to a Gaussian, while fast glass transitions lead to an exponential distribution of frozen-in energies in the glass. It is argued that amorphous semiconductors…
A newly developed integrated SQUID magnetic spectrometer yields direct high-resolution measurements of the optically induced magnetization in a 10 \ensuremath{\mu}m-diam sample of ${\mathrm{Cd}}_{0.8}$${\mathrm{Mn}}_{0.2}$Te. Both the magnitude and the picosecond dynamics of the magnetic response have been studied and…
Viscosity data for supercooled liquids are reexamined in terms of the random-potential model with use of the concept developed for treatment of electronic transport in random media with energetic disorder. \ensuremath{\eta}(T) is found to obey the predicted exp[(${\mathrm{T}}_{0}$/T${)}^{2}$] law covering 10 decades i…
The authors describe a method to estimate the critical supersaturation sigma c above which a growing crystal face becomes kinetically rough. They discuss the relation of sigma c with the step free energy kT gamma . The method is tested with computer simulations of the growth of the (001) face of a simple cubic crystal…
Comb polymers with semi-flexible main chains and rod-like nematogenic side chains form interesting nematic phases, largely as a consequence of competition between polymer entropy and rod order. The authors model this competition taking main chains of various stiffness and side groups of various length. Depending on vo…
Usual Penrose tilings are defined by a set of five phases gamma j which add up to an integer. The authors study the general case where the phases add up to any number and show that these generalised tilings can be obtained with four tiles (two thick rhombi and two thin rhombi) with different colourings of the edges. T…
Thermoreflectance spectra of Pb1-xGexTe (x=0, 0.02, 0.03, 0.07 and 0.1) have been investigated in the energy range 1.2 to 4.4 eV at temperatures above and below the phase transition temperature. The change of the interband transitions on the Ge content x in the cubic phase (300 K) have been obtained. Thermoreflectance…