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  • 1965-1969  (10)
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  • 1
    Electronic Resource
    Electronic Resource
    Polymerization of caprolactam. Part IV. Stannic chloride - caprolactam complex (1967)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 103 (1967), S. 244-250 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zinntetrachlorid bildet mit Caprolactam einen Komplex im Molverhältnis 1:2. Es wurde die Rolle dieses Komplexes bei der Initiierung der Polymerisation von Caprolactam untersucht. Bei der Polymerisationstemperature zersetzt sich der Komplex unter Entwicklung von 2 Mol Chlorwasserst off pro Mol des Komplexes. Es wird angenommen, daß durch den Komplex selbst keine erhebliche Initiierung stattfindet, da nicht nachgewiesen werden konnte, daß er ausgeprägte Eigenschaften von BRØNSTED-Säuren hat, während die Polymerisation die Merkmale der Initiierung durch eine starke Säure besitzt. Die Polymerisation wird durch den entwickelten Chlorwasserstoff in Gang gesetzt.
    Notes: SnCl4 forms a 1:2 molar complex with caprolactam, and the role of this complex in initiating the polymerization of caprolactam has been studied. At the temperature of polymerization, the complex decomposes with the evolution of two moles of HCl per mole of complex. Direct initiation by the complex itself is considered not to be important as it was not found to have strong BRØNSTED acid properties, while the polymerization has the characteristics of initiation by a strong acid. The evolved HCl initiates the polymerization.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1967.021030123
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  • 2
    Electronic Resource
    Electronic Resource
    Environmental effects in free radical polymerizations. Methacrylonitrile and iso-Butyraldehyde (1967)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 105 (1967), S. 1-7 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird die radikalische Polymerisation von Methacrylnitril in Gegenwart eines Aldehyds untersucht. Die allgemeinen kinetischen Ergebnisse zeigen, daß der Aldehyd nur als ein sehr aktiver Überträger wirkt. Die physikalischen Eigenschaften des Polymeren sind dem niedrigen Molekulargewicht zuzuschreiben. NMR-spektroskopische Messungen bestätigen, daß in diesem Polymeren keine gesteigerte Taktizität auftritt.Da die Vinylcyanideinheiten im Acrylnitril und im Methacrylnitril hinreichend ähnlich sind und Methacrylnitril keine Komplexe mit Aldehyden bildet, wurde gefolgert, daß auch Acrylnitril keine Aldehyd-Komplexe bildet; dies steht im Einklang mit früheren Beobachtungen.
    Notes: The polymerization of methacrylonitrile in an aldehyde environment has been studied. The general kinetic results are consistent with the aldehyde acting only as a very efficient transfer agent. The physical properties of the polymer are directly attributable to the low molecular weight of the polymers. NMR spectroscopy confirmed that there was no increased tacticity in these polymers.It is considered that the vinyl cyanide units in both acrylonitrile and methacrylonitrile are sufficiently similar to undergo complexing with the aldehyde to similar extents and thus it is concluded that acrylonitrile cannot form complexes with aldehydes which is in agreement with previous observations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1967.021050101
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  • 3
    Electronic Resource
    Electronic Resource
    Crystalline poly(vinyl bromide) (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 5 (1967), S. 271-276 
    Details
    ISSN: 0449-2986
    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.1967.110050311
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  • 4
    Electronic Resource
    Electronic Resource
    Triethyl aluminum dissociation: A comment on the electrical conductivity investigation (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 5 (1967), S. 79-81 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.110050115
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  • 5
    Electronic Resource
    Electronic Resource
    The polymerization of ε-caprolactam: Initiation by water (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 5 (1967), S. 577-582 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.110050707
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  • 6
    Electronic Resource
    Electronic Resource
    Dehydrochlorination reactions in polymers. Part II. Chlorinated polystyreneFor Part 1 of this series, see Burnett et al.1 (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 2297-2310 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dehydrochlorination of chlorinated polystyrene was studied in the temperature range 120-220°C., when HCl was the sole volatile product. The dehydrochlorination was accompanied by the slow development of color and chain scission. The elimination rate fell too rapidly with reaction extent to be accounted for by reduction of reagent. Solution studies in o-dichlorobenzene indicated that the reaction was initially first-order in polymer concentration but was retarded by the polyene reaction products. The overall elimination was interpreted as a radical process in which the product was an active retarder. These observations are also valid for the elimination of HBr from brominated polystyrene.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150050909
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal reactions of polyacrylonitrile (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 6 (1968), S. 2127-2135 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The exothermic process which occurs on heating polyacrylonitrile above 200°C. is studied with a differential scanning calorimeter and by following volatiles production. The process is associated with coloration of the polymer and the production of ammonia. It is not due to chain scission degradation, which occurs in this temperature range and also produces volatiles.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.150060810
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  • 8
    Electronic Resource
    Electronic Resource
    Crystallization kinetics of high polymers: Isotactic polystyrene (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 433-447 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The crystallization kinetics of a sample of isotactic polystyrene have been measured at various temperatures. Despite the presence of secondary crystallization sufficient accuracy can be attained to enable an Avrami relationship with a constant integral value of n to be assigned to most of the rate curves. The interpretation of the Avrami constants in terms of crystallization by growth of spherical entities, produced at fixed sites, is verified by microscope observations.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100030203
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  • 9
    Electronic Resource
    Electronic Resource
    Dehydrochlorination reactions in polymers. Part III. Vinylidene chloride-styrene copolymers (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 6 (1968), S. 951-962 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A systematic study of the effect of styrene units on the thermal stability of vinylidene chloride copolymers was made. In general, the copolymers were more easily dehydrochlorinated than the homopolymer. The copolymers eliminate HCl at rates that could only be interpreted in terms of styrene group activation. However, the elimination rate fell too rapidly with reaction extent to be accounted for by concentration changes or weak links and was consistent with retardation by the reaction products. The elimination was a radical process and accompanied by chain scission and crosslinking in competition.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.150060424
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  • 10
    Electronic Resource
    Electronic Resource
    Environmental effects in free-radical polymerizations. Part III. Vinyl chloride and n-butyraldehyde (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 1467-1480 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The properties of poly(vinyl chloride) samples prepared by a free-radical process in the presence of n-butyraldehyde have been studied from the point of view of polymer tacticity, branching, molecular weight, and relative crystallinity. The postulate of a polymer radical-aldehyde complex, invoked to explain the increased crystallinity, was tested. The polymers had a lower degree of polymerization and branching than normal, and these parameters rather than increased syndiotacticity were responsible for the high degree of crystallinity. Both molecular weight and branching affect the crystallinity, since polymer samples prepared in the presence of various transfer agents with similar molecular weights were less crystalline than those prepared in aldehyde, but yet more crystalline than high molecular weight bulk polymer. Polymers prepared in aldehyde had a lower degree of branching than those formed in other transfer agents. It was concluded that aldehyde was effective in increasing the crystallinity of poly(vinyl chloride) in these two ways, and so appeared to be unique among the transfer agents. There was no evidence for assuming any complexing between polymer radicals and aldehyde.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150050627
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