Materials Literature
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In this paper we examine the detailed relationship between the density-wave and unit-cell descriptions of quasicrystals. We show that phonons, phasons, and dislocations correspond to translations, distortions, and rearrangements of unit cells. The associated density-wave images closely resemble experimental electron m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of lyotropic polymer liquid crystalsTheo OdijkCite this: Macromolecules 1986, 19, 9, 2313–2329Publication Date (Print):September 1, 1986Publication History Published online1 May 2002Published inissue 1 September 1986https://pubs.acs.org/doi/10.1021/ma00163a001https://…
Semiconductor crystallites of characteristic dimension\sim20-100Å can be made by precipitation in liquids and dielectrics. These crystallites have bulk-like internal lattices. The optical spectra show partially resolved discrete features that result from carrier spatial confinement in three dimensions. Spectral shifts…
The growth and collapse of transient vapour cavities near a rigid boundary in the presence of buoyancy forces and an incident stagnation-point flow are modelled via a boundary-integral method. Bubble shapes, particle pathlines and pressure contours are used to illustrate the results of the numerical solutions. Migrati…
The band structure of chromium dioxide, which is an important material because of its magnetic properties, has been calculated with the augmented spherical wave method by performing self-consistent spin-polarised calculations. The majority-spin electrons are metallic, whereas the minority-spin electrons are semiconduc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleDendritic macromolecules: synthesis of starburst dendrimersDonald A. Tomalia, H. Baker, J. Dewald, M. Hall, G. Kallos, S. Martin, J. Roeck, J. Ryder, and P. SmithCite this: Macromolecules 1986, 19, 9, 2466–2468Publication Date (Print):September 1, 1986Publication History Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystalline syndiotactic polystyreneN. Ishihara, T. Seimiya, M. Kuramoto, and M. UoiCite this: Macromolecules 1986, 19, 9, 2464–2465Publication Date (Print):September 1, 1986Publication History Published online1 May 2002Published inissue 1 September 1986https://pubs.acs.org/…
A new approach to the scalar Preisach model of hysteresis, which emphasizes its phenomenological nature and mathematical generality, is described. The theorem, which gives the necessary and sufficient conditions for the representation of actual hysteresis nonlinearities by the scalar Preisach model, is reported. The s…
SECTION I: MODIFIED STARCHES-THEIR CHEMISTRY AND PROPERTIES. Converted Starches. Cross-Linked Starches. Acetylated Starch and Miscellaneous Organic Esters. Hydrox-yethylated Starches. Hydroxypropylated Starches. Phosphory-lated Starches and Miscellaneous Inorganic Esters. Cationic Starches. Succinate and Substituted S…
Thermoluminescence and EPR measurements in RT X-irradiated CaO are reported. Two glow peaks at 360 and 400K are associated with the thermal destruction of two new donor-type paramagnetic defects of extrinsic character. The EPR spectrum of the defect that produces the first glow peak consists of an intense central line…
The authors report the results of a molecular dynamics (MD) simulation of stoichiometric (S) and non-stoichiometric (NS) sodium beta -Al 2 O 3 . Results confirm the hopping diffusion up to 1000K governed by the flatness of the sodium-ion potential surface in the conduction plane. A detailed analysis of the Na + -ion d…
A theory is presented for the successive sixfold Fourier components, ${C}_{6n}$, in the bondorientational order in the neighborhood of a $\mathrm{s}\mathrm{m}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{i}\mathrm{c}\ensuremath{-}A\ensuremath{-}\mathrm{h}\mathrm{e}\mathrm{x}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{c}\ensuremath{…
Stable, well-defined conical structures have been observed to develop on the surface of excimer laser etched polyimide. Deliberate seeding shows that these are induced by the shielding effect of particulate impurities and indicates means for controlling the surface microstructure.
Abstract The dynamic mechanical properties of natural rubber and bromobutyl rubber (used in automotive suspension parts) were investigated to determine the effect of particle size of carbon black filler and state of cure of the rubber matrix. The results indicate that state of cure has little effect on storage modulus…
Abstract Linear regression analysis studies with residuals of heat capacity vs. temperature ( C p vs. T) data above the glass transition temperature ( T g ) for polyisobutylene (PIB) of molecular weights M¯ v = 1,350,000 and M = 4900 show that the data points can be represented by three straight lines in each case. Th…
Abstract The influence of cryoground rubber (CGR) on the curing characteristics, physical properties, network structure, and failure behavior of natural rubber (NR) has been investigated. CGR was added at two different levels of curatives and in two different ways (i) in powder form and (ii) in mill‐sheeted form (obta…
Abstract The cure of a polyimide derived from pyromellitic dianhydride (PMDA) and oxydianiline (ODA) has been studied using infrared spectroscopy. A factorial experimental design, combined with regression analysis, was used to find the optimum curing conditions. It was shown that five micron films can be cured by heat…
Abstract A series of aliphatic polyesters having CH 2 /COO ratios from 2 to 14 in their repeat units were blended with a copolymer of vinylidene chloride containing 13.5% by weight of vinyl chloride. Blends of polyesters having CH 2 /COO < 4 did not form completely miscible amorphous phases, whereas polyesters havi…
Abstract The thermal behavior of various cellulose samples with different degrees of crystallinity as measured by X‐ray diffraction techniques was studied with a differential scanning calorimeter (DSC). The broad endothermic peak which appears between 110 and 160°C is due to loss of absorbed (bound) water. Since a dir…
Abstract The effects of temperature, molecular weight and its distribution, side chain branching, and the structure of polymers on the elastic behavior of bulk homopolymers were investigated, by using logarithmic plots of first normal stress difference ( N 1 ) against shear stress (σ 12 ) and logarithmic plots of stor…