Materials Literature
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Abstract A new class of polyanhydrides synthesized from nonlinear hydrophobic fatty acid esters, based on ricinoleic, maleic acid, and sebacic acid, possessed desired physico‐chemical and mechanical properties for use as drug carriers. The polymers were synthesized by melt condensation to yield film‐forming polymers w…
The primary metallization technique in the semiconductor industry for the past decade has been magnetron sputtering. The general industry trend towards damascene processing requires the capability to fill trenches and vias with sub-one-half micron widths and aspect ratios (AR) as high as 3:1. At these dimensions and g…
Abstract The thermal reaction between N ‐phenylmaleimide and 2‐allylphenol was taken as a model reaction in order to obtain information about chain extension and crosslinking mechanisms of the thermal curing of bismaleimides with diallylbisphenol A. Isolation (preparative HPLC) and characterization ( 1 H and 13 C NMR,…
We present here a short summary of two rather different, but complementary, simulations of plastic deformation in a flexible chain glassy polymer. In the first, atomistic simulation, a molecular structure model is used in which well‐established force fields between atoms and atom groups on a typical chain polymer are…
Abstract Compatibilization of blends of linear low‐density polyethylene (LLDPE) and polystyrene (PS) with block copolymers of styrene (S) and butadiene (B) or hydrogenated butadiene (EB) has been studied. The morphology of the LLDPE/PS (50/50) composition typically with 5% copolymer was characterized primarily by scan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn Situ EXAFS Study of the Photocatalytic Reduction and Deposition of Gold on Colloidal TitaniaA. Fernandez, A. Caballero, A. R. Gonzalez-Elipe, J.-M. Herrmann, H. Dexpert, and F. VillainCite this: J. Phys. Chem. 1995, 99, 10, 3303–3309Publication Date (Print):March 1, 1995P…
Cyclic fatigue growth rates in R‐curve ceramics have been observed to depend very strongly on the maximum applied stress intensity, K max , and only weakly on the stress intensity range, Δ This behavior is rationalized through measurement of crack wake shielding characteristics as a function of these fatigue parameter…
The effective sintering rates and viscosities of three‐dimensional composite packings have been studied using a discrete numerical model. The packings consist of random mixtures of hard and soft spheres of the same size. With increasing substitution of hard particles for soft particles in the packing, the viscosity in…
We consider spatially discrete nonlinear diffusion equations that are similar in form to the Cahn-Hilliard and Cahn-Allen equations.Since these equations are spatially discrete, solutions exist even for negative gradient energy coefficients.In order to study these equations analytically on finite subsets of one, two a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnzymic Mediated Synthesis of Conjugated Polymers at the Langmuir Trough Air-Water InterfaceFerdinando F. Bruno, Joseph A. Akkara, Lynne A. Samuelson, David L. Kaplan, Braja K. Mandal, Kenneth A. Marx, Jayant Kumar, and Sukant K. TripathyCite this: Langmuir 1995, 11, 3, 889–…
In a decagonal quasicrystal with composition AI70Co15Ni15 two different types of superstructure have been found by electron microscopy techniques. One of these superstructures has previously been observed. The other newly characterized superstructure causes a ring-like zone of low diffraction intensities and, addition…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSequence-Specific Photocleavage of DNA by an Expanded Porphyrin with Irradiation above 700 nmDarren Magda, Meredith Wright, Richard A. Miller, Jonathan L. Sessler, and Petra I. SansomCite this: J. Am. Chem. Soc. 1995, 117, 12, 3629–3630Publication Date (Print):March 1, 1995P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew kinetic model for thermal decomposition of heterogeneous materialsJose A. Caballero, Rafael Font, Antonio Marcilla, and Juan A. ConesaCite this: Ind. Eng. Chem. Res. 1995, 34, 3, 806–812Publication Date (Print):March 1, 1995Publication History Published online1 May 2002P…
The common description of the electrical behavior of a nematic liquid crystal as an anisotropic dielectric medium with (weak) ohmic conductivity is extended to an electrodiffusion model with two active ionic species. Under appropriate, but rather general conditions the additional effects can lead to a distinctive chan…
The computer simulation of two-dimensional foams allows a comprehensive description of the mechanical properties of these systems. In particular, we have calculated elastic constants and yield stress of disordered foams as functions of the gas fraction Π@, greatly improving and extending the previous results of Bolton…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic Structure of Discrete Pseudotetrahedral Oxovanadium Centers Dispersed in a Silica Xerogel Matrix: Implications for Catalysis and PhotocatalysisKim Tran, Mark A. Hanning-Lee, Abhijit Biswas, A. E. Stiegman, and Gary W. ScottCite this: J. Am. Chem. Soc. 1995, 117, 9…
The photoluminescence properties of Pr(3+)-doped GeS(x)-based glasses are studied and compared with those of other sulfide and fluoride glasses. The possibility of highly pump-power-efficient fiber amplifiers based on these GeS(x)-containing glasses in the telecommunications window at 1.3microm is discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater-Saturated Mesoporous MCM-41 Systems Characterized by 1H NMR Spin-Lattice Relaxation TimesEddy Walther Hansen, Ralf Schmidt, Michael Stoecker, and Duncan AkporiayeCite this: J. Phys. Chem. 1995, 99, 12, 4148–4154Publication Date (Print):March 1, 1995Publication History…
The ferroelectric switching of columnar 1,2,5,6,8,9,12,13-octakis-((S)-2-heptyloxy-propanoyloxy)dibenzo[e,l]pyr-2-heptyloxy-propanoyloxy)dibenzo[e,1]pyrene was studied in detail between 60°C and the clearing point 115°C. The switching angle (optical tilt angle) is ±24.5° up to 10V μm−1 and ±37° at higher field strengt…
Carbon fibres prepared by the catalytic decomposition of acetylene over finely dispersed cobalt, supported on amorphous silica, are often helix shaped. The structure of such carbon fibres was studied by means of various electron diffraction techniques and by electron microscopy. It was shown that the tubules are hollo…