Liquid Crystalline 1,3-Disubstituted Cyclopentanes
Novel liquid crystalline 1,3-disubstituted cyclopentanes were studied for physicochemical and temperature characteristics.
Materials Literature
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XPS study of transition metal/alumina model catalysts: Equilibrium and energy referencing
Abstract We have used XPS to examine some model catalysts obtained by vapour deposition of Ni, Pd and Pt on an α‐alumina single‐crystal. It is shown that the binding energies of the substrate core levels with respect to the metal Fermi level depend on the metal work function. This is due to the fact that the common re…
The synthesis and characterization of magnetic iron-modified polyimide films
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe synthesis and characterization of magnetic iron-modified polyimide filmsJ. J. Bergmeister, J. D. Rancourt, and L. T. TaylorCite this: Chem. Mater. 1990, 2, 6, 640–641Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue…
Three-Dimensional Pattern Drafting
An algorithm is presented for computationally drafting patterns from three-dimen sional data, in which the fabric is everywhere in contact with the underlying surface. The algorithm is based on an earlier theoretical framework, which models draping a garment as a two-step process. In this part, a functional relationsh…
Mechanical Properties of β‐Si 3 N 4 ‐Whisker/Si 3 N 4 ‐Matrix Composites
Composites containing 30 vol%β‐Si 3 N 4 whiskers in a Si 3 N 4 matrix were fabricated by hot‐pressing. The composites exhibited fracture toughness values between 7.6 and 8.6 MPa · m 1/2 , compared to 4.0 MPa · m 1/2 for unreinforced polycrystalline Si 3 N 4 . The improvements in fracture toughness were attributed to c…
Nonsoliton model for dielectric anomalies at the incommensurate-ferroelectric phase transitions in [N(CH3)4]2XCl4(X=Co,Zn)
The dielectric peaks observed at the phase transition between an incommensurate- and a commensurate-ferroelectric phase have usually been explained in terms of a soliton-regime model of the incommensurate phase. However, in the case of [N(${\mathrm{CH}}_{3}$${)}_{4}$${]}_{2}$X${\mathrm{Cl}}_{4}$ (X=Co, Zn), recent obs…
Photochromism of side-chain liquid crystal polymers containing spironaphthoxazines
Side-chain liquid crystal polyacrylates and polysiloxanes containing different photochromic spironaphthoxazine side groups were synthesized. Thermodynamic, spectral and kinetic properties of the polymers were investigated. The structure of the mesophase is discussed.
Recent Advances in Combustion Modelling
This volume gathers the contributions of six world experts to a course on combustion modelling. Therefore, a pedagogical effort has been made in writing up these texts, which cover state of the art advances in most aspects of combustion science. The book is aimed at students, researches and engineers, as was the cours…
Isoporphyrins. Near-Infrared Dyes with Noticeable Photochemical and Redox Properties
Abstract An isoporphyrin prepared by the action of dibenzoyl peroxide on 5,10,15,20-tetraphenylporphinatozinc(II) (ZnTPP) shows absorption bands in the near-infrared region, is photolyzed to afford ZnTPP, and is facilely reduced by amines to ZnTPP.
Formation of Controlled Adiabatic Shear Bands in AISI 4340 High Strength Steel
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Thermodynamic Theory of Single‐Crystal Lead Titanate with Consideration of Elastic Boundary Conditions
A phenomenological free‐energy function including the effects of elastic boundary conditions was presented and used to investigate the single‐domain, single‐crystal properties of the ferroelectric perovskite, PbTiO 3 . In particular, the effects of tensile and compressive hydrostatic stress on the spontaneous polariza…
The quinone diimine part of polyaniline is electrochemically inactive in nonaqueous electrolyte
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe quinone diimine part of polyaniline is electrochemically inactive in nonaqueous electrolyteF. Ueda, K. Mukai, I. Harada, T. Nakajima, and T. KawagoeCite this: Macromolecules 1990, 23, 23, 4925–4928Publication Date (Print):November 1, 1990Publication History Published onl…
Impact modification of styrene‐acrylonitrile copolymers by methyl methacrylate grafted rubbers
Abstract Monodisperse methyl methacrylate grafted latex rubber ( MMA ‐ g ) particles (0.12‐0.13 µm) have been used for the impact toughening of a series of styrene‐acrylonitrile ( SAN ) copolymers of varied AN content. It was found that the MMA ‐ g particles are most effective in toughening SANs containing about 25 to…
Coupled-map lattice model for crystal growth
We formulate a computationally simple model for crystal growth, employing a lattice of coupled maps. This model allows us to study kinetic roughening and its effect on the surface tension. We demonstrate that the cusp in the Wulff plot, which via the usual construction gives rise to faceted crystals, disappears at suf…
Atomistic study of ⅓〈1123〉{1011} dislocations in h.c.p. crystals. I. Structure of the dislocation cores
The core structure of ⅓〈1 123〉 dislocations on {1011} planes in h.c.p. crystals has been studied by computer simulation using a truncated Lennard-Jones potential. An edge dislocation and a mixed dislocation parallel to the [2113] direction (30°dislocation) extend over the (1011) plane. A mixed dislocation parallel to…
Diffusion Bonding of Zirconia/Alumina Composites
ZrO 2 /Al 2 O 3 composites with from 0% to 100% Al 2 O 3 content were diffusion bonded at 12.5 MPa for 30 min in the temperature range 1450° to 1500°C. Under appropriate bonding conditions, a bonding strength greater than 1000 MPa was achievable between dissimilar materials with different thermal expansion coefficient…
Magnetic metal‐polymer composites: Thermal and oxidative decomposition of Fe(CO)5 and CO2 (CO)8 in a poly (vinylidene fluoride) matrix
Abstract The aim of this study is the synthesis and characterization of polymer composites in which microscopic metal or metal oxide particles are incorporated by thermal or photolytic decomposition in solid solutions of organometallic complexes in polymers. In contrast to conventional composites or filled polymer com…
Hard and Soft Acid‐Base Model Verified for Monovalent Cation Selectivity
Abstract Experimental support was obtained for a quantitative ion‐exchange model based on the principle of hard and soft acids and bases (HSAB) applied to monovalent cation exchange on clay minerals, oxides, and exchange resins. According to the model, the thermodynamic exchange constant ( K ex ) can be obtained from…
Inorganic/organic composites for optical application
Organically modified ceramics (ORMOCERs) have been prepared with respect to optical applications. The investigations show that materials can be synthesized with interesting properties for a variety of potential applications. They can be used as hard coatings for the protection of optical polymers, e.g. CR 39 or fluore…
Synthesis, spectral, thermal, and flammability studies of phenolphthalein polyphosphate esters
Abstract Polyphosphate esters were synthesized from phenolphthalein and aryl phosphorodichloridates by interfacial polycondensation using a phase transfer catalyst. The polymers were characterized by IR, 1 H‐, 13 C‐, and 31 P‐NMR spectroscopy. The molecular weights were calculated by end group analysis using 31 P‐NMR…