Materials Literature
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The usefulness of dimethyl-, diethyl-, dibutyl- and dioctyltin oxide for the preparation of syndiotactic poly(β- d, l -butyrolactone) was studied. Most polymerizations were conducted in bulk and a few polymerizations in toluene or chlorobenzene. The reaction temperature was varied between 50 and 100 °C. Below 50 °C th…
Cascade-branched, “graft on graft” polybutadienes, denoted arborescent graft polymers, were prepared by hydrosilylation of polybutadiene vinyl groups with chlorodimethylsilane, followed by grafting with living polybutadiene chains. Repeated hydrosilylation−anionic grafting cycles led to a treelike outward growth, yiel…
Gilbert's damping constants, α , of Co-Cr-Ta and Co-Cr-Pt thin films are determined by Q-band FMR analysis using single crystal magnetic thin films epitaxialIy grown on MgO(110) substrates. α is calculated from the resonance width of the FMR spectrum. α of Co77Cr19Ta4is found to increase from 0.016 to 0.028 as magneti…
Abstract Shell‐crosslinked knedels are nanometer‐sized (5–200 nm diameters), amphiphilic core‐shell spheres that are prepared by the self‐assembly of amphiphilic block copolymers into polymer micelles, followed by crosslinking of side chain functionalities along the block composing the shell of the polymer micelles. S…
Models for predicting ring or rotor yarn hairiness are built using a back-propagation neural network algorithm. These models are based on fiber property input measured by three different systems, hvi, afis, and fmt. We compare the prediction results from the different models, which reveal that yarn hairiness measureme…
Large electro-optic effects of liquid-crystal materials are attractive in applications to various optical devices in a wider wavelength region. Fundamental optical properties in the submillimeter wave region, such as refractive indices and transmission losses for some cyanobiphenyl nematic liquid crystals, have been i…
High-resolution ac calorimetric studies show that the dispersion of 70-\AA{}-diameter hydrophilic silica spheres (aerosils) has a substantial effect on several liquid-crystal transitions in butyloxybenzlidene octylaniline (4O.8). The weakly first-order nematic $(N)$--isotropic $(I),$ the second-order nematic $(N)$--sm…
The degrees of uniaxial and in-plane molecular orientation for homopolyimides (PI) and PI/PI binary blends were estimated from the absorption dichroism of perylenetetracarboxydiimide (PEDI) bound to the main chains. Thermal cure of a slightly drawn film of poly(amic acid) (PAA) derived from 3,4,3,‘4‘-biphenyltetracarb…
New diamantane-based polyimides are synthesized by reacting of 4,9-bis[4-(4-aminophenoxy)phenyl]diamantane with various aromatic tetracarboxylic dianhydrides. Films of these polyimides have low dielectric constants, ranging from 2.58 to 2.74, and low moisture absorptions less than 0.3%. Four of these films have good s…
The effects of variations in salinity (5, 10, 15, 25, 35‰) and temperature (2, 5, 10, 15, 18, 22, 25°C) on growth, valve morphology, and toxicity were examined in the marine planktonic diatom Pseudo-nitzschia pseudodelicatissima (Hasle) Hasle from Danish waters. Growth rates were salinity and temperature dependent. Th…
A Bayesian treatment for phase calculation in the multiwavelength anomalous diffraction (MAD) technique is presented. This approach explicitly treats effects of errors correlated among measurements at different wavelengths and between Bijvoet pairs. The resulting method, which is called Bayesian correlated MAD phasing…
Lamellar domain spacings ( D ) of blends of a styrene-2-vinylpyridine (SP) diblock copolymer and homopolymers corresponding to the block polymers (S and/or P), of which molecular weights are lower than that of the block polymer, were examined by small-angle X-ray scattering (SAXS), and the dimensions of block chains i…
We have investigated the magnetic electronic structures of PtMnSb, NiMnSb, ${\mathrm{Ni}}_{2}\mathrm{MnSb},$MnSb, MnAlGe, and ${\mathrm{Mn}}_{2}\mathrm{Sb}$ by soft-x-ray absorption spectroscopy (XAS) and magnetic circular dichroism (MCD) measurements in the Mn $2p$ core absorption region. Different degrees of the ele…
Abstract Stress relaxation experiments were performed on two grades of polycarbonate at room temperature. The tests were performed in uniaxial extension and compression at deformations from the small strain, linear viscoelastic regime to the highly nonlinear viscoelastic regime just below yield. Simultaneous to the co…
The fatigued state of Pt-PZT-Pt ferroelectric capacitors (FECAP) was investigated by means of piezoelectric coefficient, polarisation charge and permittivity measurements. The suppression of switching polarisation Pr S appears to be the result of freezing of ferroelectric domains without affecting the lattice dielectr…
Abstract Poly(triacetylene)s [PTAs, (CCCRCRCC) n –] are a new class of linearly conjugated polymers with a nonaromatic all‐carbon backbone. To explore structure–property relationships in PTAs, we prepared a series of monodisperse oligomers ranging from monomer to hexamer by oxidative Glaser–Hay coupling of a bif…
To synthesize nonlinear optical polyimides exhibiting high nonlinearity and high thermal stablity, a new monomer bearing phenylenediamine and a diazo benzene-type nonlinear optical chromophore (compound 1 ) was synthesized and polymerized with 4,4‘-(hexafluoroisopropylidene)diphthalic anhydride. This diazo chromophore…
A structured package for radiation analysis, SPRADIAN, is developed and its application is presented. This study is primarily motivated by necessity of a quantitative analysis of severe radiative environment which the MUSES-C capsule encounters during its reentry into the earth atmosphere. In comparison with other rad…
Resistivity and ac-susceptibility measurements demonstrate that the cation size mismatch at the $A$ site in perovskite manganites influences greatly the electrical and magnetic properties which are associated with colossal magnetoresistance. It has been reported that the Pr${}_{1\ensuremath{-}x}$Ca${}_{x}$MnO${}_{3}$…
The thermal behaviour and phase morphology of poly(3-hydroxybutyrate) (PHB) and starch acetate (SA) blends have been studied by differential scanning calorimetry, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy and polarizing optical microscopy. PHB/SA blends were immiscible. The melting t…