Materials Literature
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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…
We have measured the elastic constants of two series of glasses in the Ge-As-Se system. Each series consisted of samples whose compositions were chosen to produce an average atomic coordination ($〈r〉$) which ranged from 2 to nearly 3. Different local structures were produced by our making one series much higher in As…
The effect of hydrogen plasma treatment on indium tin oxide (ITO), fluorine-doped tin oxide (FTO), and indium-doped zinc oxide (IZO) films has been studied. X-ray photoelectron spectroscopy analysis shows that ITO and FTO surfaces get reduced to yield elemental indium and tin, respectively. Annealing of the plasma tre…
The crystal structure of BaCo2FeI6027 W-type hexagonal ferrite is refined from room-temperature X-ray single crystal data. This compound is hexagonal: a = 0.59043(7) nm and c = 3.2910(7) nm, the space group is P63/mmc and the cell contains two formula units (Z = 2); the structure can be described by the sequence… RS̄S…
The fundamental optical absorption bands have been found at about 4.5 eV in the alkali cuprous halide (ACH) crystals of K 2 CuCl 3 , K 2 CuBr 3 , Rb 2 CuCl 3 , and Rb 2 CuBr 3 , and from 3.9 to 5.2 eV in Rb 2 CuI 3 . From the measured ultraviolet photoelectron spectra of the ACH's and the alkali silver halide (ASH) cr…
Nb${\mathrm{Te}}_{4}$ is a quasi-one-dimensional metallic compound. The crystal structure is tetragonal and is modulated by an incommensurate distortion wave at room temperature. We show that on the cooling of the crystal into the temperature range 100-50 K, two distinct sets of sharp spots can occur along the streaks…