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  • 1
    Electronic Resource
    Electronic Resource
    Korrosionskennzeichnung von Kupferlegierungen - Polarisationswiderstände in Salzlösungen - (1970)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 21 (1970), S. 332-335 
    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: Characterization of the corrosion behaviour of copper alloys - polarisation resistances in salt solutionsExperiments with electrolyte copper, Cu with 6% Fe and CuNi90/10 (with Fe or Cr) demonstrate that measured polarisation resistances enable on principle conclusions to be drawn with respect to the probable corrosion behaviour of Cu alloys. This applies in particular to aerated solutions where the negative influence of Cr and the positive influence of Fe can be clearly distinguished. The variation of polarisation resistance with time enables groupes of alloys to be differentiated which initially are characterized by identical kinetic parameters.
    Notes: Versuche mit E-Cu, Cu mit 6% Fe, CuNi 90/10 (mit Fe oder Cr) in 3% NaCl zeigen, daß die Messung des Polarisationswiderstandes grundsätzlich Aussagen über das Korrosionsverhalten von C-Legierungen ermöglicht. Dies gilt vor allem für belüftete Lösungen, in denen der negative Einfluß von Cr und der Positive Einfluß von Fe deutlich erkennbar werden. Die zeitliche Änderung des Polarisationswiderstandes ermöglicht die Differenzierung von Legierungsgruppen, die anfangs gleiche kinetische Parameter aufweisen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19700210504
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  • 2
    Electronic Resource
    Electronic Resource
    High 1,4-cis-polybutadiene by uranium catalyst. III. Strain induced crystallization and processability (1976)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 50 (1976), S. 87-99 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Strömungskristallisation von 1,4-cis-Polybutadien, einschließlich einer Probe mit extrem hohem cis-Gehalt, dargestellt in Gegenwart eines Uran-Katalysators, wurde in einem Kapillarrheometer untersucht. Der Einfluß von Temperatur, Druck und Schergeschwindigkeit auf die Strömungskristallisation wurde bestimmt und mit den Verhältnissen im Strömungsfeld eines Walzwerks verglichen. Es wird gezeigt, daß die Verarbeitabarkeit auf dem Walzwerk wesentlich verbessert wird, wenn die Bedingungen eine Kristallisation des Materials begünstigen. Die Molekulargewichtsverteilung spielt nur eine untergeordnete Rolle für die Polybutadiene mit höchstem cis-Gehalt. Die Gründe für die Beziehung zwischen Kristallisierbarkeit und Verarbeitbarkeit auf der Walze werden kurz diskutiert.
    Notes: The crystallization in flow of various 1,4-cis-polybutadienes, including an extremely high cis-polybutadiene content obtained with uranium catalyst, has been studied in a capillary rheometer. The influence on the crystallization in flow of temperature, pressure, shear rate has been investigated and compared with the conditions in the flow field of a roll-mill. It is shown that when these conditions are suitable for inducing, the crystallization of the rubber, the processability at the roll-mill is substantially improved. The molecular weight distribution plays only a minor role for the highest cistactic polybutadienes. The reason of the correlation between crystallization and roll-mill processability is briefly discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1976.050500109
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  • 3
    Electronic Resource
    Electronic Resource
    High 1,4-cis-polybutadiene by uranium catalyst. IV. Stretch induced crystallization and ultimate properties (1976)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 50 (1976), S. 101-113 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Dehnungseigenschaften im Ungleichgewicht von Polybutadien mit hohem cis-Gehalt, dargestellt in Gegenwart eines Katalysators auf Uran-Basis, werden im Vergleich zu anderen Polybutadienen mit geringerer sterischer Reinheit untersucht. Die Bedingungen für die spannungsindizierte Kristallisation werden beschrieben. Es wird gezeigt, daß die Eigenschaften des Polymeren und die spannungsinduzierte Kristallisation unmittelbar in Beziehung stehen; ihre Abhängigkeit vom cis-Gehalt wird diskutiert. Die höhere sterische Reinheit des mit einem Uran-Katalysator erhaltenen Polybutadiens bedingt seine überragenden Eigenschaften.
    Notes: Non-equilibrium tensile properties of high-cis-polybutadiene obtained from an uranium based catalyst are evaluated in comparison with other polybutadienes having lower sterical purity. The conditions for incipient stretch induced crystallization are described. Ultimate properties and strain induced crystallization are found strongly related and their dependence on cis-content is discussed. The higher sterical purity accounts for the best performance of uranium polybutadiene.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1976.050500110
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  • 4
    Electronic Resource
    Electronic Resource
    Reduced variables for the overall crystallization rate of some polymers (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 12 (1974), S. 375-379 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.130120702
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  • 5
    Electronic Resource
    Electronic Resource
    Ethylene-butadiene copolymers, 2.Part 1: cf.1. Long branching, double bond distribution and their effect on polymer properties (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 2187-2194 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The principal structural characteristics of ethylene-butadiene copolymers prepared with a modified vanadium catalyst are described. The distribution of the butadiene monomeric units, though non-random, is sufficiently homogeneous at low monomeric units content of butadiene (1-3 mole-%) that a ready and efficient vulcanization with sulfur based systems is easily achieved.Long chain branching, which has a detrimental effect on the copolymer properties, can be measured rheologically and controlled at a very low level by the catalyst system. Vulcanized ethylene-butadiene copolymers show improved mechanical properties with respect to high density polyethylene and good processability before curing.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790907
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  • 6
    Electronic Resource
    Electronic Resource
    Tetramethylthiuram disulfide and 2-mercaptobenzothiazole as binary accelerators in sulfur vulcanization. II. Exchange reactions between the accelerators and their zinc salts in the absence of rubber (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 1053-1061 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Exchange reactions between tetramethylthiuram disulfide, 2-mercaptobenzothiazole, and sulfur in the presence of ZnO were studied by heating powdered mixes to vulcanization temperatures at a preprogrammed rate in a DSC. The reaction was stopped at points along the thermal curve and the mixture was analyzed. Sulfide exchange reactions between the accelerators leads to a mixed accelerator and dimethyldithiocarbamic acid that is trapped by ZnO to give the zinc accelerator complex bis(dimethyldithiocarbamato)zinc (II). Exchange also occurs between the accelerators and ligands on both the thiuram and benzothiazole zinc accelerator complexes. Zinc complexes containing ligands of both accelerators were synthesized. These showed little interaction on being heated with sulfur, but on dissolution yielded a spectrum of products similar to that obtained in the other system containing zinc. Reactions to account for changes in the spectrum of products on heating different mixes of these curatives to different temperatures are discussed. © 1995 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070580612
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  • 7
    Electronic Resource
    Electronic Resource
    Tetramethylthiuram disulfide and 2-mercaptobenzothiazole as binary accelerators in sulfur vulcanization. IV. Vulcanization of polyisoprene in the presence of ZnO (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 62 (1996), S. 647-653 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polyisoprene was vulcanized with binary accelerator systems comprising mixtures of the zinc salts of tetramethylthiuram disulfide (TMTD) and 2-mercaptobenzothiazole (MBT). Samples were heated in a DSC at a programmed rate, the reaction was stopped at points along the thermal curve, and the system was analyzed. Extractable curatives and reaction intermediates were analyzed by HPLC and the crosslink density of samples measured by swelling. DSC curves for the different systems displayed similar characteristics and their similarity to the curve obtained with the zinc salt of TMTD rather than to the curve obtained with the zinc salt of MBT suggested that the reaction was dominated by the former accelerator. This conclusion was supported by HPLC analyses of extractable curatives. A reaction mechanism for the binary system is discussed. © 1996 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Tetramethylthiuram disulfide and 2-mercaptobenzothiazole as binary accelerators in sulfur vulcanization. I. Exchange reactions between the accelerators and sulfur in the absence of rubber (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 57 (1995), S. 1391-1407 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Exchange reactions between tetramethylthiuram disulfide, 2-mercaptobenzothizole, and sulfur were studied by heating powdered mixes to vulcanization temperatures at a programmed rate in a DSC. The reaction was stopped at points along the thermal curve and the mixture was analyzed by HPLC. On dissolution, even unheated samples undergo a sulfide exchange reaction leading to a mixed accelerator, while polysulfides of the thiuram and mixed accelerator form in low concentrations. On heating, higher concentrations of these polysulfides are formed, particularly in the presence of elemental sulfur. Dimethyldithiocarbamic acid, formed in the exchange, influences the product spectrum if it remains trapped in the DSC pan. Tetramethylthiourea is formed only at elevated temperatures when dimethylamine, a degradation product of the acid, is trapped in the DSC pan. A series of reactions is proposed to explain the product spectrum obtained under different conditions. © 1995 John Wiley & Sons, Inc.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070571115
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  • 9
    Electronic Resource
    Electronic Resource
    Tetramethylthiuram disulfide and 2-mercaptobenzothiazole as binary accelerators in sulfur vulcanization. III. Vulcanization of polyisoprene in the absence of ZnO (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 62 (1996), S. 1057-1066 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polyisoprene was vulcanized with the binary accelerator system tetramethylthiuram disulfide-2-mercaptobenzothiazole (TMTD-MBT) in the absence of ZnO. Samples were heated in a DSC at a programmed rate, the reaction was stopped at points along the thermal curve, and the system was analyzed. Extractable curatives and reaction intermediates were analyzed by HPLC and the crosslink density of samples measured by swelling. Two cross-linking reaction sequences were identified, the first being initiated by polysulfides of the mixed accelerator N,N-dimethyldithiocarbamylbenzothiazole disulfide, and the second by MBT. All the TMTD is consumed in the first reaction sequence. Synergism of the reaction is discussed in terms of recent work detailing a reaction mechanism for TMTD-accelerated vulcanization. © 1996 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    An investigation of the solubility of organic vapors in polymer films using an optical wave guide interfacial probe (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 2197-2201 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1988.090261012
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