Materials Literature
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Abstract Copolymers of 3,4‐ethylenedioxythiophene and 3‐methylthiophene have been prepared by recurrent potential pulses using monomer mixtures with various concentration ratios, their properties being compared with those of the corresponding homopolymers. In addition, different technological applications have been te…
γ-LnLn‘S 3 (Ln = La, Ce; Ln‘ = Er, Tm, Yb) have been prepared as dark red to black single crystals by the reaction of the respective lanthanides with sulfur in a Sb 2 S 3 flux at 1000 °C. This isotypic series of compounds adopts a layered structure that consists of the smaller lanthanides (Er, Tm, and Yb) bound by sul…
In part 1 of this work, the successful design of additives for the selective inhibition of ( R, S ) - mandelic acid crystallization was described. Now, in part 2 of our study, we show how such additives may be used, together with the known ternary phase diagram, as the basis for a crystallization process that yields a…
Abstract Two phenylethynyl phthalic anhydride‐capped imide oligomers, AFR‐PEPA‐2 and AFR‐PEPA‐8, with molecular weights of 1 601 and 4 699 g · mol −1 , respectively, were synthesized and characterized. The AFR‐PEPA‐ N oligomers show higher glass transition temperatures and higher thermal decomposition temperatures tha…
The reaction of [Ti(mu-ONep)(ONep)3]2 (ONep = OCH2C(CH3)3) with a series of heterocyclic methanol derivatives [tetrahydrofurfuryl alcohol (H-OTHF), thiophene methanol (H-OTPM), or 2-pyridylcarbinol (H-OPy)-collectively termed H-OR*], led to the isolation of a novel family of OR*-substituted titanium alkoxide precursor…
We report the structure and magnetic properties of Zn1-xMnxO thin films grown on Si(001) substrates by pulsed laser deposition. Structure and phase evolution with Mn doping has been studied using x-ray diffraction, electron diffraction, and high-resolution electron microscopy. The undoped and 1% Mn-doped ZnO films are…
Abstract PI surfaces were modified by RF plasma sputtering of a PTFE target. Ultrathin fluoropolymer films of 10–50 nm thickness were deposited. The sputter‐deposited polymeric films were characterized by XPS, ToF‐SIMS and FT‐IR spectroscopy. The results indicated that the chemical composition and molecular structure…
The quasiparticle and optical properties of BeH2 are computed by means of the all-electron GW approximation in conjunction with the projector augmented wave (PAW) method. The GW approximation, through the calculation of the self-energy and the optical dielectric function in the random phase approximation, shows that B…
We have proposed that the excellent blood compatibility of poly(2-methoxyethylacrylate (MEA)) is caused by freezing bound water contained in it on the basis of results on platelet activation (Tanaka and Mochizuki, J Biomed Mater Res A 2004; 68:684-695). To clarify the applicability of this mechanism to other indexes f…
An attempt has been made to investigate the thermal degradation of thermoplastic segmented polyurethane (TSPU) as a function of hard segment (HS) content. TSPU, and its corresponding hard segment and soft segment, has been studied in air and nitrogen. Comparing the results of solid conversion of polyurethane in differ…
Optical manipulation of the magnetic anisotropy is demonstrated for bilayered manganites, La2-2xSr1+2xMn2O7, by means of femtosecond Kerr-rotation measurements. Upon the photoexcitation on the x=0.32 crystal, the magnetization exhibits the precessional motion for about 1 ns, revealing the directional change of the mag…
A co-rotating twin screw extruder was used for blending thermoplastic elastomeric blends of ground rubber tire (GRT) and maleic anhydride grafted polypropylene (PP-g-MA). The dynamic reaction occurring between the blends necessitates a study of the processing parameters of the extruder. The effects of the extruder scr…
Abstract The effect of mercapto‐ and anhydride‐functionalized ethylene propylene diene rubber (EPDM) or ethylene–vinyl acetate (EVA) copolymers on the vulcanization kinetics of natural rubber/EPDM blends was investigated using the oscillatory disk rheometer. The mercapto groups in both EPDM and EVA copolymers resulted…
Epitaxial BeZnO layers, the candidates for active barrier layers composed of the ZnO/Be x Zn 1− x O quantum well structure, were successfully grown using the hybrid beam deposition method. The Be rate of x in the grown Be x Zn 1− x O layer was estimated to be 0.11. The optical properties caused by the thermal quenchin…
The first representatives of 4H (BaMnO3-type structure, P63/mmc, Z = 4) and 9R (BaMnO3-type structure, Rm, Z = 9) inverse Perovskite phases are presented. The phases are obtained within the solid solutions (Sr3-xBaxN)E with E = Bi, Sb. The crystal structures and homogeneity ranges were studied by combined X-ray and ne…
Magnetization and neutron diffraction measurements have been performed on LaMn 0.5 Fe 0.5 O 3+ d and LaMn 0.5 Cr 0.5 O 3+ d perovskites. Neutron diffraction study revealed a G-type antiferromagnetic component as well as a ferromagnetic one for both stoichiometric compounds. Magnetic structure refinement for the LaMn 0…
Abstract This paper reports new addition reactions of oxetanes with certain protonic reagents such as carboxylic acid, phenol, and thiol, and with certain aprotic reagents such as acyl chloride, thioester, phosphonyl dichloride, silyl chloride, and chloroformate using quaternary onium salts as catalysts. The kinetic s…
Abstract A novel positive‐working, photosensitive polyimide, poly[1,4‐phenyleneoxy‐1,4‐phenylene‐2,2′‐di(2‐nitrobenzyloxy)benzophenone‐3,3′,4,4′‐tetracarboxdiimide] (OPI‐Nb), developable with an aqueous base was prepared by the o ‐nitrobenzylation of a polyimide, poly(1,4‐phenyleneoxy‐1,4‐phenylene‐2,2′‐dihydroxybenzo…
We studied the spectroscopic properties of two thulium-doped Lu 3 Al 5 O 12 (Tm:LuAG) samples with Tm 3+ concentrations of 0.5 and 5 at.%. Judd–Ofelt theory was used to analyse the absorption spectra and to determine the radiative transition rates. Fluorescence measurements were further performed to determine the lumi…
Abstract Chiral conjugated polymers P‐1 and P‐2 were synthesized by the polymerization of ( S )‐3,3′‐diiodo‐2,2′‐bisbutoxy‐1,1′‐binaphthyl and ( S )‐6,6′‐dibromo‐2,2′‐bisbutoxy‐1,1′‐binaphthyl, respectively, with 5,5′‐divinyl‐2,2′‐bipyridine through a Heck cross‐coupling reaction. Chiral polymer complexes P‐C‐1 and P‐…