Materials Literature
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Abstract New biodegradable/biocompatible ABC block copolymers, poly(ethylene oxide)‐ b ‐poly(glycidol)‐ b ‐poly( L , L ‐lactide) (PEO‐PGly‐PLLA), were synthesized. First, PEO‐ b ‐poly(1‐ethoxyethylglycidol)‐ b ‐PLLA was synthesized by a successive anionic ring‐opening copolymerization of ethylene oxide, 1‐ethoxyethylg…
Abstract The blend materials from waterborne polyurethane (WPU)/starch (ST) with different contents (10–90 wt %) were satisfactorily prepared by using the solution casting method. Their miscibility, structure, and properties were investigated by wide‐angle X‐ray diffraction (WAXD), scanning electron microscope (SEM),…
The condensation of the CH acidic heterocycles 4-alkyl-2,6-dioxo-1,2,5,6-tetrahydropyridine-3-carbonitrile (5a and b) and barbituric acid (15) with electron-rich thiophene aldehydes and benzaldehyde derivatives affords the respective monomethine dyes 10-13 and 17-19. The formylation of 5a,b and 15 with N,N'-diphenylfo…
Abstract The phase behavior and the crystallization kinetics of blends composed of isotactic polypropylene (iPP) and linear low‐density polyethylene (LLDPE) were investigated by differential scanning calorimetry. The phase behavior indicates the formation of separate crystals of iPP and LLDPE at each investigated blen…
Abstract We synthesized an AB 2 ‐type monomer, 4‐{4‐[di(4‐aminophenyl)methyl]phenoxy}phthalic acid, which contained one phthalic acid group and two aminophenyl functionalities. The direct self‐polycondensation of the AB 2 ‐type monomer in the presence of triphenylphosphite as an activator afforded a hyperbranched poly…
The deuteron spin-lattice relaxation in the substoichiometric dideuterides ${\mathrm{HfD}}_{x}(1.68<~x<~1.90)$ and ${\mathrm{TiD}}_{x}(x=1.91)$ has been measured at temperatures between 300 and 830 K. The results are compared with previous proton NMR measurements on dihydrides of similar hydrogen contents. The d…
The first automated system for combinatorial synthesis and high throughput investigation of electrical properties of conductive polymers is described. The equipment provides a polymerization of defined mixtures of monomers into a thin layer on the addressed electrodes of an electrode array followed by measurements of…
The structural analysis of an enzymatic reaction intermediate affords a unique opportunity to study a catalytic mechanism in extraordinary detail. Here we present the structure of a tetrahedral intermediate in the catalytic cycle of aspartate-beta-semialdehyde dehydrogenase (ASADH) from Haemophilus influenzae at 2.0-A…
Poly(5,8-dialkoxyanthraquinone-1,4-diyl) P(5,8-OR-1,4-AQ) (R = n -C 6 H 13 through n -C 16 H 33 ), poly(5,8-dihydroxyanthraquinone-1,4-diyl) P(5,8-OH-1,4-AQ), poly(4,8-diaminoanthraquinone-1,5-diyl) P(4,8-NH 2 -1,5-AQ), poly(4,8- dihydroxyanthraquinone-1,5-diyl) P(4,8-OH-1,5-AQ), and poly(4,8-dinitroanthraquinone- 1,5…
We present electron-spin-resonance data of ${\mathrm{Ti}}^{3+}$ ${(3d}^{1})$ ions in single crystals of the novel layered quantum spin magnet TiOCl. The analysis of the g tensor yields direct evidence that the ${d}_{\mathrm{xy}}$ orbital from the ${t}_{2g}$ set is predominantly occupied and owing to the occurrence of…
Abstract The ultrasonic treatment of unfilled butadiene rubber (BR) gum with a grooved‐barrel ultrasonic reactor was carried out, leading to changes in the structure and physical properties. The ultrasonic treatment of BR gum led to gel formation, with the amount dependent on the amplitude. The rheological and mechani…
It is well known that overdamped and unforced dynamical systems do not oscillate. However, well-designed coupling schemes, together with the appropriate choice of initial conditions, can induce oscillations when a control parameter exceeds a threshold value. We demonstrate this effect in a specific system, a soft-pote…
High-throughput (HT) crystallization experiments were conducted with sertraline free base in the presence of mono-, di- and triacidic salt formers. Over 3600 crystallization trials were conducted, leading to the identification and characterization of 18 crystalline salt forms. Due to the large number of crystallizatio…
Resonant photoemission in the Pu $5f$ and Pu $6p$ states is compared to that in the Gd $4f$ and Gd $5p$ states. Spectral simulations, based upon an atomic model with angular momentum coupling, are compared to the Gd and Pu results. Additional spectroscopic measurements of Pu, including core level photoemission and x-r…
We show that the various crossovers between dynamical regimes observed in experiments and simulations of supercooled liquids can be explained in simple terms from the existence and statistical properties of dynamical heterogeneities. We confirm that dynamic heterogeneity is responsible for the slowing down of glass fo…
High filling of single wall carbon nanotubes (SWCNT) with C$_{60}$ and C$_{70}$ fullerenes in solvent is reported at temperatures as low as 69 $^{o}$C. A 2 hour long refluxing in n-hexane of the mixture of the fullerene and SWCNT results in a high yield of C$_{60}$,C$_{70}$@SWCNT, fullerene peapod, material. The peapo…
We have modeled magneto-dielectric phase transitions in ABX$_3$-type layered triangular lattice compounds. The model consists of a spin system (magnetic transition) and a lattice system (dielectric transition). Magnetic exchange interactions are supposed to change with a relative positionbetween two spins. This assump…
We use scanning tunneling microscopy (STM) and Auger electron spectroscopy to study the behavior of adsorbed phosphine (PH$_{3}$) on Si(001), as a function of annealing temperature, paying particular attention to the formation of the Si-P heterodimer. Dosing the Si(001) surface with ${\sim}$0.002 Langmuirs of PH$_{3}$…
The electric properties of the sodium niobate perovskite ceramic were investigated by impedance spectroscopy in the frequency range from 5 Hz to 13 MHz and from room temperature up to 1073 K, in a thermal cycle. Both capacitance and conductivity exhibit an anomaly at around 600 K as a function of the temperature and f…
The zero-field intergrain tunneling conductivity $\ensuremath{\sigma}$ of sintered and granular ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ increases linearly with temperature over the range $\ensuremath{\sim}20--300\mathrm{K},$ at least. The residual conductivity of the investigated samples ranges over more than four ord…