Materials Literature
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Specific migration studies, using food simulants, have been conducted on a range of polymers which are used in food packaging and contain commonly used fatty acid amide slip additives. Migration levels using the test conditions (10 days at 40 degrees C) were found to depend primarily upon the food simulant and the pol…
An analysis is presented of the pressure versus time characteristics during the pump-down of a vacuum system with a reversibly adsorbed phase, e.g., water at room temperature, using the conservation of mass equation, where the quantity adsorbed is derived from a suitable adsorption isotherm. This quasistatic approach…
In this study, the induction of the 70-kD family of heat shock proteins (hsp70) has been examined in stony coral tissues. In these experiments, the only difference from control conditions has been exposure to a temperature approximating that at which field bleaching in the Caribbean is known to occur, approximately 30…
From recent experimental data on BN thermodynamic propeties, the equilibrium phase diagram for boron nitride has been plotted, which differs from the generally accepted Bundy-Wentorfs one. At atmospheric pressure cubic boron niride has been shown to be a thermodynamically stable modification up to temperatures of 1600…
The diameter of particles which adversely affects the yield has been shrinking as ULSI devices are more and more miniaturized. Ultrafine particles with diameters of 0.1 μm or less have become important recently. Ultrafine particles of this type are expected to be difficult to remove. This study has established a metho…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModification of the Phase Stability of Polymer Blends by Diblock Copolymer AdditivesJacek Dudowicz, Karl F. Freed, and Jack F. DouglasCite this: Macromolecules 1995, 28, 7, 2276–2287Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published…
The results of microwave dielectric constant (ϵmw) and dc conductivity (σdc) of doped polyaniline (PAN) samples in different charge delocation regimes are reported. With camphor culfonic acid doped PAN prepared in m-cresol solvent (PAN-CSA (m-cresol)) respresenting the most delocalized material, a negative ϵmw is meas…
BaO, ${\mathrm{Fe}}_{2}$${\mathrm{O}}_{3}$, and ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$, melted and rapidly quenched in the molar ratio of 7:5:8 using 1 mol % ${\mathrm{Bi}}_{2}$${\mathrm{O}}_{3}$ (a catalytic additive), form a truly amorphous glass with a locally ordered structure of boroxol rings, characterized by thre…
The effect of additions on the magnetic properties of MnZn ferrites for high frequency power supplies was studied. The investigation revealed that various combinations of dopants added to the ferrite modify the grain boundary resistivity and the magnetic permeability spectra at constant microstructure. Particularly, t…
High-resolution X-ray diffraction experiments were performed on a single crystal of PMN in the temperature range of 90-300 K, by applying an electric field (up to E = 3.0 kV cm-1) along the [111] direction. A first order electric field-induced phase transition, from the mean cubic phase to a rhombohedral Phase, was ev…
The Nakamura equation is used to generate a direct relation (first-order differential equation) between the Avrami and Ozawa crystallization rate constants. As a result, it is possible to compare isothermal and constant-cooling-rate crystallization data in a consistent manner. This is done for isotactic polypropylene…
Abstract A novel process for the industrial production of hydroxylated fatty acids involves epoxidation of plant oils and their derivatives, followed by catalytic epoxy ring opening in the presence of water or other hydrogen donors, such as alcohols, diols, and amines. Depending on the starting material, epoxidation f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of CO2 with Magnesium Oxide Surfaces: a TPD, FTIR, and Cluster-Model Calculation StudyY. Yanagisawa, K. Takaoka, S. Yamabe, and T. ItoCite this: J. Phys. Chem. 1995, 99, 11, 3704–3710Publication Date (Print):March 1, 1995Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen-Bonding-Mediated Generation of Side Chain Liquid Crystalline Polymers from Complementary Nonmesogenic PrecursorsS. Malik, Pradeep K. Dhal, and R. A. MashelkarCite this: Macromolecules 1995, 28, 7, 2159–2164Publication Date (Print):March 1, 1995Publication History Pu…
A dramatic change occurs in the electronic spectrum of a thin (solid) film of polyaniline doped with the “primary dopant,” d,l-camphorsulfonic acid (spun from its solution in chloroform on to a quartz plate) when it is exposed to the vapor of the “secondary dopant” m-cresol, at room temperature. The resistance decreas…
The structure of an end-grafted polymer layer immersed in poor solvent is investigated through Monte Carlo simulation based on Edward's Hamiltonian. When the solvent quality becomes sufficiently poor, lateral inhomogeneities are observed to develop in the monomer density in the direction parallel to the grafting plane…
The charge transport and storage mechanisms in π‐doped oligothiophenes can be better understood through a more profound knowledge of their optical excitations. These materials have been investigated using a quantum‐chemical approach, results which can also be applied to the interpretation of the experimental data repo…
A novel method of preparing low-density microporous polymeric foam materials has been utilised to produce media which are effective in crossflow microfiltration applications. Polyhipe polymer (PHP) is produced by the polymerisation of a high-internal-phase emulsion (HIPE), resulting in a homogeneous, highly porous, lo…
A constitutive equation for a planar fiber network under transverse compression is derived allowing for an in-plane fiber orientation distribution. The fibers are assumed to be well dispersed in space and to have a large aspect ratio and uniform diameter. A compression experiment, performed on a glass-fiber network ob…
This communication describes our results using these novel alkoxysilane precursors for PECVD of SiO_2 films in an inductively coupled rf plasma reactor. The effects of deposition time, rf power, and organosilane pressure on the films’ characteristics are described.