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1

Digitale Medien

Solid state extrusion of thermoplastic elastomers 4 (1984)

Bandara, U. ; Dröscher, M. ; Thomas, E. L.

Springer

Colloid & polymer science 262 (1984), S. 538-550

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ISSN: 1435-1536

Schlagwort(e): solid state extrusion ; block copoly(ether ester) ; structure ; small angle X-ray scattering ; mechanical properties

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau

Notizen: Abstract A solid state extrusion technique is applied as to produce oriented block copoly(ether ester) under various physical conditions. The morphology of the extruded samples is characterized in relation to the extrusion parameters and hard segment compositions of the polymer, using thermal analysis and X-ray methods. The lateral dimensions of the crystalline domains are found to be approximately 150 Å depending on the extrusion conditions. The statistics of the long range periodicity of the structure along the extrusion direction is in agreement with a one-dimensional two phase model, the crystalline portion of which does not vary much in thickness (35 – 45 Å). The unexpected increase in the long period and the thermal shrinkage suggest the existence of strained interlamellar amorphous chains (tie molecules). The observed variations in tensile properties are interpreted under the assumption that both the number of such tie molecules and their fully extended lengths are determined by the hard segment composition and the extrusion conditions. It is also argued that the increase in the glass transition temperature is not only a function of the composition of hard segments in the amorphous phase but also of the number of strained tie molecules.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01451517

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2

Digitale Medien

Synthetic Methodologies and Structures of Metal-[C60]Fullerene Complexes (1998)

Mathur, Pradeep ; Mavunkal, Ipe J. ; Umbarkar, Shubhangi B.

Springer

Journal of cluster science 9 (1998), S. 393-415

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ISSN: 1572-8862

Schlagwort(e): Fullerene ; transition-metal ; complex ; synthesis ; structure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract A review of the chemistry of transition metal-[C60]fullerene complexes is presented. The main focus is directed toward the different methodologies for obtaining both metal bound and ligand bound complexes of C60, and the different types of structures which have been so far identified for metal-C60 complexes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1021934431858

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3

Digitale Medien

Synthesis and Structure of a Novel Mg6 Cluster Molecule Mg6(μ3-OH)2(μ3-Br)2(μ-Br)8(THF)8 (2000)

Wu, Qingguo ; Zhang, Yousheng ; Wang, Suning

Springer

Journal of cluster science 11 (2000), S. 253-260

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ISSN: 1572-8862

Schlagwort(e): magnesium ; cluster ; hydroxide ; structure ; fluxionality

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract A novel Mg6 cluster molecule with the formula of Mg6(μ 3-OH)2(μ 3-Br)2(μ-Br)8(THF)8 (1) has been isolated in 38% yield from a reaction of the Grignard reagent, 2-naphthyl-Mg-Br with BBr3 in THF. The structure of 1, determined by a single-crystal X-ray diffraction analysis, contains two Mg3 triangles linked together by two bridging bromide ligands. Within each Mg3 triangle, one hydroxide and one bromide ligand function as triply bridging ligands capping both sides of the Mg3 triangle. The coordination geometry around each Mg(II) ion is approximately octahedral. NMR studies revealed that compound 1 is highly fluxional in solution.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1009033303026

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4

Digitale Medien

Crystal structures of the cobalt(III), nickel(II), copper(II), and zinc(II) complexes of 2-thio-6-picoline N-oxide (1998)

West, Douglas X. ; Brown, Christine A. ; Jasinski, Jerry P. ; [weitere]

Springer

Journal of chemical crystallography 28 (1998), S. 853-860

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ISSN: 1572-8854

Schlagwort(e): 2-thio-6-picoline N-oxide ; structure ; cobalt(III) ; copper(II) ; nickel(II) ; zinc(II)

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract Structures of the following compounds have been solved: tris(2-thio-6-picoline N-oxide)cobalt(III), [Co(6MOS)3], orthorhombic, Pca21, a = 17.871(3), b = 14.061(2), c = 15.964(2) Å, V = 4011(1) Å3, Z = 8, and μ = 1.193 mm−1; bis (2-thio-6-picoline N-oxide)nickel(II), [Ni(6MOS)2], orthorhombic, Pbca, a = 15.602(8), b = 13.606(4), c = 13.348(8) Å, V = 2833(4) Å3, Z = 8, and μ = 1.655 mm−1; bis(2-thio-6-picoline N-oxide)copper(II), [Cu(6MOS)2], orthorhombic, Pbca, a = 13.914(5), b = 12.984(5), c = 15.663(6) Å, V = 2830(2) Å3, Z = 8, and μ = 1.836 mm−1; and bis(2-thio-6-picoline N-oxide)zinc(II), [Zn(6MOS)2], triclinic, P − 1, a = 7.9737(8), b = 11.7786(9), c = 7.9206(8) Å, α = 104.502(7), β = 104.495(8), γ = 93.445(8)°, V = 691.3(1) Å3, Z = 2, and μ = 2.106 mm−1. The steric effect of the methyl group in the six-position of the N-oxide ring is considered in comparing these structures to complexes of 2-thiopyridine N-oxide.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1022886116342

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5

Digitale Medien

Synthesis and crystal structure of [Y(NO3)3(OH2)3]·(Me2-16-crown-5)·H2O (1998)

Lu, Tongbu ; Peng, Xinyu ; Inoue, Yoshihisa ; [weitere]

Springer

Journal of chemical crystallography 28 (1998), S. 197-201

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ISSN: 1572-8854

Schlagwort(e): Yttrium(III) ion ; crown ether ; structure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract The complex [Y(NO3)3(OH2)3]·(Me2-16-crown-5)·H2O has been prepared and its crystal and molecular structure determined using single crystal X-ray diffraction. The colorless crystals belong to the monoclinic space group P21/n with Z = 4. Lattice parameters are a = 10.420(1), b = 17.257(3), c = 14.646(2) Å, β = 96.79(1)°, V = 2615.1(6) Å3. The yttrium(III) ion is nine-coordinate, bonded to three bidentate nitrate groups and three water molecules. The average Y–O(nitrate) and Y–O(water) distances are 2.42(3) and 2.33(1) Å, respectively. The average HO–H···O hydrogen bonded separation is 2.767Å.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1022470227008

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6

Digitale Medien

Crystal structure of N-benzylmethylammonium dihydrogen-monophosphate monohydrate, [C6H5CH2NH2CH3]H2PO4·H2O (1998)

Elaoud, Zakaria ; Kamoun, Slaheddine ; Jaud, Joel ; [weitere]

Springer

Journal of chemical crystallography 28 (1998), S. 313-315

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ISSN: 1572-8854

Schlagwort(e): Organic phosphate ; structure ; nonlinear optical material

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract The salt N-benzylmethylammonium dihydrogenmonophosphate monohydrate is monoclinic with the following unit cell dimensions: a = 6.356(1)Å, b = 8.385(7)Å, c = 11.472(5)Å, β = 104.32(1)°, space group P21 with Z = 2. The structure consists of infinite parallel two-dimensional [110] planes built of mutually connected ions and water molecules by strong O–H···O and N–H···O hydrogen bonding. There are no contacts other than normal van der Waals interactions between the layers.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1021861621824

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7

Digitale Medien

Crystal structure and resonance Raman spectroscopic study of {1,3-bis[3-(5-amino-1,2,4-triazolyl)]triazenido-N′4,N2,N″4}chloro palladium(II)-methanol (1/1) (1998)

Hanot, V. P. ; Robert, T. D. ; Haasnoot, J. G. ; [weitere]

Springer

Journal of chemical crystallography 28 (1998), S. 343-351

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ISSN: 1572-8854

Schlagwort(e): Azole ; triazene ; Pd(II) ; Cu(II) ; structure ; Raman

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract The crystal and molecular structure of the complex [Pd(batt)Cl]·CH3OH, in which Hbatt is 1,3-bis[3-(5-amino-1,2,4-triazolyl)]triazene, has been determined by X-ray diffraction methods. The crystals are triclinic, space group $$P_{\bar 1} $$ (a = 10.1883(9) Å, b = 10.5095(8)Å, c = 13.1760(11) Å, α = 94.518(6)°, β = 109.040(7)°, γ = 113.678(7)°; Z = 4). The deprotonated batt− ligand exhibits terdentate chelate coordination with a new nitro-type ligation mode of the triazenido group and N4 coordination of the two outer triazolyl substituents. The asymmetric unit contains two crystallographically independent, almost parallel Pd(batt)Cl molecules with Pd–Pd contacts of 3.4584(7)Å and two independent methanol molecules. The complexes are packed in a layer structure with numerous intermolecular H-bond connections. Raman spectra have been recorded for various excitation wavelengths along the contour of the intense triazenido π-π* absorption band at 465 nm and resonance profiles measured for the most important Raman bands. A comparison is made with the analog [Cu(batt)Cl] complex. Structural and spectral differences between the two molecules are emphasized and related to differences in metal-ligand bonding.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1022456023875

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8

Digitale Medien

Synthesis and Molecular Structure of the Mercury-Bridged Heteronuclear Complex [Pt3(dppm)3 {(μ4-Hg)-RuCp(CO)2}2][PF6]2 (1998)

King, William D. ; Lukehart, Charles M.

Springer

Journal of cluster science 9 (1998), S. 107-121

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ISSN: 1572-8862

Schlagwort(e): Platinum ; mercury ; ruthenium ; heteronuclear ; cluster ; structure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract Addition of a THF solution prepared by stirring [CpRu(CO)2]2 over Na/Hg amalgam to a solution of the triplatinum cluster [Pt3(dppm)3(CO)][PF6]2 (1) in THF gives the heteronuclear cluster [Pt3(dppm)3{(μ4-Hg)–RuCp(CO)2}2] [PF6]2 (2) in 40% yield following chromatography. A single crystal X-ray study of 2 reveals structural parameters for the Pt3Hg2 molecular core that are consistent with those of other structurally characterized complexes of this type. 1H, 13C, and 31P NMR spectra of this complex indicate that the structure observed in the solid state is retained in solution.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1021933831065

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9

Digitale Medien

Suggestion of a new dimensionless number for dynamic plastic response of beams and plates (1998)

Zhao, Ya-Pu

Springer

Archive of applied mechanics 68 (1998), S. 524-538

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ISSN: 1432-0681

Schlagwort(e): Key words dynamic plastic response ; structure ; Johnson's damage number ; response number

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Summary A dimensionless number, termed response number in the present paper, is suggested for the dynamic plastic response of beams and plates made of rigid-perfectly plastic materials subjected to dynamic loading. It is obtained at dimensional reduction of the basic governing equations of beams and plates. The number is defined as the product of the Johnson's damage number and the square of the half of the slenderness ratio for a beam; the product of the damage number and the square of the half of the aspect ratio for a plate or membrane loaded dynamically. Response number can also be considered as the ratio of the inertia force at the impulsive loading to the plastic limit load of the structure. Three aspects are reflected in this dimensionless number: the inertia of the applied dynamic loading, the resistance ability of the material to the deformation caused by the loading and the geometrical influence of the structure on the dynamic response. For an impulsively loaded beam or plate, the final dimensionless deflection is solely dependent upon the response number. When the secondary effects of finite deflections, strain-rate sensitivity or transverse shear are taken into account, the response number is as useful as in the case of simple bending theory. Finally, the number is not only suitable to idealized dynamic loads but also applicable to dynamic loads of general shape.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s004190050184

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10

Digitale Medien

Oceanic ridge off-axis deep structure in the Mansah region (Sumail massif, Oman ophiolite) (2000)

Jousselin, D. ; Nicolas, A.

Springer

Marine geophysical researches 21 (2000), S. 243-257

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ISSN: 1573-0581

Schlagwort(e): diapir ; mantle ; Oman ; ophiolite ; seamount ; structure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract Large scale structural mapping of the Oman ophiolite indicates that the Mansah area (Sumail massif) was a ridge off-axis region at the time the ophiolite was detached. This paper presents a detailed structural mapping of the region. We show that, as opposed to other off-axis areas, it contains plunging lineations, correlated with a thick Moho transition zone and chromite pods, indicative of a mantle diapir. However this diapir has a discontinuous structure, it is bounded by shear zones and types of diabases that are not found elsewhere in Oman; it also has a broken crust, strongly affected by hydrothermal alteration. This suggests that Mansah fossilized an off-axis diapir intruding a cooling lithosphere. It may be a good candidate to be the root of an off-axis seamount such as those found in the East Pacific, and may bring new insights into this particular volcanism which we are only beginning to explore.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1026741208295

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