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  • Polymer and Materials Science  (12)
  • Wiley-Blackwell  (12)
  • Cambridge University Press
  • 1985-1989  (12)
  • 1970-1974
  • 1955-1959
  • 1935-1939
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  • Wiley-Blackwell  (12)
  • Cambridge University Press
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  • 1
    Electronic Resource
    Electronic Resource
    Melting, crystallization, and solution behavior of chain molecules with hydrocarbon and fluorocarbon segments (1988)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 189 (1988), S. 911-925 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Melting, crystallization, and solution behavior of n-alkanes with fluorocarbon segments of twelve carbon atoms on one end, F(CF2)12(CH2)nH, or on both ends, F(CF2)12(CH2)n(CF2)12F were investigated by DSC, MAS 13C NMR, light scattering, and birefringence studies. Both triblock F(CF2)m(CH2)n(CF2)mF and diblock F(CF2)12(CH2)nH compounds with 4 ≦ n ≦ 14 melt by a two-step process. In the first step, the alkyl segment conformations gain nearly liquid like trans/ gauche ratios, while the perfluorinated segments remain ordered. “Gels” which incorporate the entire solvent are formed by crystallization from even dilute solutions of hydrocarbon and fluorocarbon solvents. The gels are built up of extremely long, interdigitated needles of the pure solute. Due to the bilayer structures and different degrees of ordering of the hydrocarbon and the fluorocarbon segments, the crystals grow preferentially in the direction parallel to the lamellar surface. Light scattering experiments in octane demonstrated the formation of micelle type associates.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1988.021890422
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  • 2
    Electronic Resource
    Electronic Resource
    Phase transitions and defect structure in the lamellar surface of polyethylene and n-alkane crystallites. Magic angle spinning 13C NMR studiesHerrn Professor Dr. R. Kosfeld zum 60. Geburtstag gewidmet (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1237-1252 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Variable temperature magic angle spinning 13C NMR experiments on linear alkanes and low molecular weight polyethylene allowed the observation of up to six carbon atoms at the chain ends near the surface of the lamellar crystallites. Conformational order-disorder and intermolecular packing effects are reflected by the spectra. The effects are discussed with regard to the peculiar phase behaviour of the n-alkanes and the fringed micella model for low molecular weight polyethylene. The solid-solid transitions of nonadecane and hexatriacontane appear to be correlated with the occurrence of specific non-liquid-like conformational disordering. Thus, conformational defects were observed for the “rotator phase” which depend on the chain length and which vary along the chain. Whilst the center part of the chain remains all-trans ordered, significant gauche defects were observed for the bonds at the chain ends. For a polydisperse low molecular weight linear polyethylene as well as for monodisperse octahexacontahectane reversible liquid-like conformational disordering of the terminal chain segments could be detected when the melting point was approached. Hence, in this case the NMR spectra indicate pre-melting of the lamella surface, while in case of the shorter n-alkanes the occurrence of end-gauche defects is correlated with solid-solid transitions.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870520
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  • 3
    Electronic Resource
    Electronic Resource
    Poly(2-vinylpyridine) block copolymers. Phase separation and electric conductivity of iodine complexesDedicated to Prof. Dr. H.-J. Cantow on the occasion of his 65th birthday (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 1153-1168 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A series of AB diblock copolymers of poly(2-vinylpyridine) (P-2VP) and either polybutadiene or polystyrene were prepared in a nonpolar solvent at low temperature. Well-defined polymers with narrow molecular weight distributions were obtained and electron micrographs showed that these block copolymers form a well-separated two-phase morphology. Percolation of P-2VP domains could be achieved for samples with 40 and with 60 mol-% of P-2VP blocks. These samples were modified by addition of various amounts of iodine in solution and in the melt. Electric conductivities of the doped composites were determined by the four-probe method. The conductivities of the two phase systems were, in general, lower than that of P-2VP doped with I2.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1989.021900521
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  • 4
    Electronic Resource
    Electronic Resource
    Einflüsse von Legierungselementen auf die Korrosion und Wasserstoffaufnahme von Eisen in Schwefelsäure - Teil II: Korrosion und DeckschichtbildungHerrn Professor Dr. rer. nat. Hans-Jürgen Engell zum 60. Geburtstag gewidmet (1985)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 36 (1985), S. 447-454 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Effects of Alloying Elements on Corrosion and Hydrogen Uptake of Iron in Sulfuric Acid Part II: Corrosion and Formation of Surface LayersThe effects of C, S, P, Mn, Si, Cr, Ni, Sn and Cu on the formation of surface layer and hydrogen uptake of iron during corrosion in 1 M H2SO4/N2 were investigated using AES, XPS, SEM and electrochemical permeation techniques.Cu, Sn, P and C are enriched on the surface of iron during corrosion in H2SO4. Cu is enriched in the metallic form. P forms a phosphate and phosphide containing surface layer. Ni is not enriched. Cr is preferentially dissolved. Cu, Sn and Ni inhibit the dissolution of iron and thus decrease the hydrogen activity. S, P and Mn (MnS) increase the corrosion and hydrogen activity. Cr forms traps in iron which increase the hydrogen uptake.
    Notes: Die Einflüsse von C, S, P, Mn, Si, Cr, Ni, Sn und Cu auf Deckschichtbildung und Wasserstoffaufnahme bei Korrosion von Eisen in 1 M H2SO4/N2 wurden mit AES, XPS, REM sowie der elektrochemischen Permeationsmethode untersucht.Cu, Sn, P und C reichern sich bei Korrosion von Eisen in H2SO4 an der Oberfläche an. Cu bleibt metallisch liegen. P bildet eine phosphat-und phosphidhaltige Deckschicht. Ni reichert sich nicht an. Cr geht bevorzugt in Lösung. Cu, Sn und Ni hemmen die Eisenauflösung und erniedrigen die Wasserstoffaktivität. S, P und Mn (MnS) erhöhen die Korrosionsgeschwindigkeit und die Wasserstoffaktivität. Cr bildet Wasserstoffallen in Eisen, die die Wasserstoffaufnahme erhöhen.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19850361004
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of phosphorus on the stability of the passive state of Fe and Fe-Ni base glasses (1988)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 39 (1988), S. 453-462 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Einfluß von Phosphor auf die Stabilität des passiven Zustands von metallischen Gläsern basierend auf Fe und Fe-NiFür metallische Gläser basierend auf Fe und Fe-Ni wurde der Einfluß einer Substitution von B durch P untersucht. Die elektrochemischen Messungen haben gezeigt, daß der Austausch von B gegen P die Bildung von Passivschichten begünstigt und deren passiven Bereich stabilisiert. Oberflächenanalytische Untersuchungen mittels AES ergaben, daß für die auf Fe-Ni basierenden Gläser die Hauptbestandteile der Passivschicht Eisenoxide, Phosphor-Sauerstoff Spezies (meistens Phosphate) und Boroxid waren, während Nickeloxid praktisch nicht auftrat. Bezüglich der Phosphorverbindungen in der Passivschicht auf dem metallischen Substrat konnte eine gewisse Ähnlichkeit festgestellt werden mit Phosphor, der auf einer (100) orientierten Fe Einkristalloberfläche durch Segregation bei erhöhter Probentemperatur angereichert und anschließend oxidiert worden war. Darüber hinaus lassen die Ergebnisse, in Übereinstimmung mit früheren Befunden für kristallines Fe, vermuten, daß Bestandteile des Elektrolyten in den Passivfilm auf dem glasartigen Substrat inkorporiert werden.
    Notes: The effects of substituting P for B in Fe base and Fe-Ni base glasses have been investigated. The electrochemical measurements have shown that a substitution of B by P increases the ability of the alloys to passivate and stability of their passive state. Surface analysis with AES revealed that for Fe-Ni base glasses the main constituents of the passive film were: iron oxides, phosphorus-oxygen species (mostly phosphates) and boron oxide whereas Ni oxides were depleted. There was a certain similarity between the Auger spectra for phosphorus in the passive film on the glassy substrate and for segregated, and subsequently oxidized, phosphorus on a (100) oriented Fe single crystal. The results suggest, moreover, in agreement with the previous findings for crystalline Fe that the electrolyte components are incorporated into the passivating film on glassy substrates.
    Additional Material: 23 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19880391003
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  • 6
    Electronic Resource
    Electronic Resource
    Beeinflussung der Morphologie und Produktivität von Schlauchpilzen durch Vorkulturbedingungen (1989)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 61 (1989), S. 656-657 
    Details
    ISSN: 0009-286X
    Keywords: Biotechnologie ; Fermentation ; Penicillin ; Morphologie ; Pellets ; Vorkultur ; Schlauchpilze ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330610828
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  • 7
    Electronic Resource
    Electronic Resource
    Überlegungen zur industriellen Antibiotika-Produktion am Beispiel der Penicillin-FermentationVortrag von J. Möller auf der Sitzung des GVC-Fachausschusses „Bioverfahrenstechnik“, 6./7. Mai 1986 in Bamberg. (1987)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 59 (1987), S. 143-145 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330590215
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of the alloying elements Ti, Nb, Mo and V on the grain boundary segregation of P in iron and steels (1987)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 10 (1987), S. 202-209 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Investigations have been performed on the effects of the alloying elements Ti, Nb, Mo and V on the grain boundary segregation of phosphorous in iron and steels. The methods are AES analysis of grain boundaries on intergranular fracture faces and field-ion microscopy and mass spectrometry (atomprobe). The elements Ti and Nb show strong interaction with P, keeping P in the grain and decreasing its grain boundary segregation. In the alloys and steels containing carbon, Ti and Nb react under formation of carbides, therefore with increasing C content the grain boundary segregation of P increases. For stoichiometric ratio Ti/C and Nb/C the segregation reaches a maximum; at higher carbon contents C displaces P from the grain boundaries. Some interfacial segregation of P is observed at or near the ferrite/carbide interface in the case of TiC, leading to a decrease of grain boundary segregation. The same effect applies for Mo2C but not for NbC. In contrast to Ti and Nb there is no direct interaction of Mo and P, which is also in contradiction to previous assumptions on the role of molybdenum in the temper embrittlement of low alloy steels.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740100405
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  • 9
    Electronic Resource
    Electronic Resource
    The net distribution of elements by element specific electron microscopy-ESI, 1. Morphological studies of polystyrene-block-poly(2-vinylpyridine) (1987)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 8 (1987), S. 401-410 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1987.030080807
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  • 10
    Electronic Resource
    Electronic Resource
    Structure and dynamics of the high-temperature polymorph of trans-1,4-polybutadiene (1988)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 9 (1988), S. 107-114 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1988.030090211
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