Materials Literature
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Abstract A liquid crystal polymer (LCP) was blended polethylene terephthalate (PET) in different concetrations to improve the barrier properties of PET in injection stretch blow molded bottles. The improvement depends on the microstructure developed at various stages of the process.In this work, the emphasis is on the…
Bei der Umsetzung von CeCl3 mit CeO2, Cer und SiO2 bzw. P2O5 im molaren Verhältnis von 5 : 3 : 1 : 3 bzw. 8 : 3 : 1 : 2 in evakuierten Quarzglasampullen (7 d, 850 °C) fallen Ce3Cl5[SiO4] (orthorhombisch, Pnma; a = 1619,7(2), b = 415,26(4), 1423,6(1) pm; Z = 4) bzw. Ce3Cl6[PO4] (hexagonal, P63/m; a = 1246,36(9), c = 40…
n-Octadecyltriethoxysilane (C 18 -TEOS) and tetraethoxysilane (TEOS) were used as the precursors to fabricate an organic-inorganic hybrid composite by sol-gel processing. The hydrolysis and initial condensation reactions of TEOS and C 18 -TEOS/TEOS mixtures were studied by 29 Si-NMR spectroscopy. The rate of disappear…
Two kinds of TPBD samples with different trans content and molecular weight were synthesized by using VCl3 and rare earth catalyst system, respectively. The effect of annealing on the phase transition of TPBD was investigated by means of DSC, WAXD and SAXS. It was found that annealing the sample in its hexagonal phase…
The insulating state of κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]I salt appearing at ambient pressure at low temperatures is suppressed by hydrostatic pressure. The resistive measurements showed that the emerging metallic state reveals superconductivity in high-quality crystals. The superconducting state with the transition tempera…
Anisotropic diamagnetic susceptibilities of polymeric fibers in liquid suspensions determined by means of the method proposed recently by us were compared with those obtained by other methods including superconducting quantum interference device (SQUID) and magnetic torque meter. Poly( p -phenylene-2,6-benzobisoxazole…
The microwave heating synthesis of (phthalocyaninato)bis(chloro)silicon(IV) prepared from diiminoisoindolene and silicon tetrachloride in quinoline has been shown to be rapid (5 min reaction time compared to 30 min with thermal heating) and results in a high yield (91% compared to 71% using thermal heating). A modifie…
New metal-free 5 and metallophthalocyanines 6-11( M = Cu , Ni , Co , Pb , Zn ) fused in peripheral positions with four 24-membered tetraoxatetraaza macrocycles were prepared by cyclotetramerization of 24,25-dicyano-4,10,13,17-tetra(toluene-p-sulfonyl)-1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22-didicontin…
Einkristalle folgender Phosphate wurden in einem Spiegelofen nach dem Zonenschmelzverfahren hergestellt und ihre Kristallstrukturen verfeinert (0,02 < R1 < 0,04 bzw. 0,04 < wR2 < 0,10): Ba2Mn(PO4)2 (a = 531,1(1), b = 896,8(1), c = 1625,6(3) pm, β = 90,26(1)°), Ba2Co(PO4)2 (a = 529,8(1), b = 884,4(1), c = 1614,4(3) pm,…
Abstract The use of the Auger parameter, the Wagner plot and a simple electrostatic model permits the determination of the local electronic and geometrical structure of Cu + sites in Cu‐ZSM‐5 catalysts. The results are in agreement with previous extended X‐ray absorption fine structure (EXAFS) and X‐ray absorption nea…
Superplastic forming grade sheets of AA 8090 Al–Li alloy were observed to contain layers of different microstructure and microtexture across the thickness cross-section. Superplastic behaviour and its relationship to the concurrent microstructural and microtextural evolution of this sheet were studied at 803 K by tens…
Structure factors for Er(3)Al(5)O(12) and Yb(3)Al(5)O(12) garnets were measured using focused synchrotron X-radiation, with lambda = 0.7500 (2) and 0.7000 (2) A, respectively. The difference electron density maps for Er(3)Al(5)O(12) and Yb(3)Al(5)O(12) were similar, as expected. This was attributed to the 4f electrons…
The relationship between Sr interdiffusion from a Pt/SrRuO 3 [SRO] top electrode into (Pb, La)(Zr, Ti)O 3 [PLZT] ferroelectric thin films with different excess Pb contents (2–10%) and leakage properties was studied. Secondary ion mass spectrometry and energy dispersive X-ray spectroscopy revealed significant Sr diffus…
Abstract Reactive compatibilization was used to control and stabilize 20–30wt% poly(dimethylsioxane) (PDMS) dispersions in nylon 6 (PA) and poly(styrene) (PS), respectively. The effect of the type of reation (amine (NH 2 )/anhydride (An), NH 2 / epoxy(E) and carboxylic acid (COOH)/E) on the morphology was studied with…
Tensile specimens of superplastic forming grade AA 8090 Al–Li alloy were deformed at constant strain rates in the range 1×10-5–1×10-2 s-1 and at constant temperatures in the range 298–843 K, to investigate their effects on the nature of stress–strain (cσ–ε curves and on the concurrent microstructures, substructures, a…
Abstract Diffraction experiments were performed on two (Nd 2 O 3 ) x (P 2 O 5 ) 1- x glasses for studying the en vironmental order of the Nd 3+ cations. In case of the metaphosphate glass (x = 0.25) a combination of X-ray and neutron diffraction data was used to separate the Nd-O and O-O first neighbor peaks. An Nd-O…
The crystal structures of the several complex oxides including MgAl 2 O 4 , α‐Al 2 O 3 , θ‐Al 2 O 3 , r ‐Al 2 O 3 , Y 2 O 3 , Y 3 Al 5 O 12 , and YAlO 3 are fully optimized by means of first‐principles total energy calculations with relaxation of all internal parameters. This is achieved by the implementation of a sim…
A linear polymer chain in good solvent condition with one end grafted on a infinitely large, impenetrable flat surface is investigated using dynamic Monte Carlo simulation on a simple cubic lattice. Chain shape and dimension, angular correlation between the direction of the end-to-end vector and that of the longest pr…
Abstract Raman and IR studies were performed for the first time for a single crystal of KNbW 2 O 9 belonging to the novel class of valence‐balanced compounds crystallizing in the structure of hexagonal tungsten bronze and exhibiting ferroelectric properties. The observed vibrational modes were assigned to the respecti…
Low molecular weight oligomers of poly- (ethylene terephthalate) (PET) and poly(ethylene naphthalate) (PEN) were synthesized and the crystallization behavior were examined. The crystallized oligomers underwent solid state polymerization (SSP) when subjected to temperatures close to melting temperature under nitrogen.…