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  • 1
    Electronic Resource
    Electronic Resource
    Cyclization of polyenes in degraded PVC (1974)
    Springer
    Reaction kinetics and catalysis letters 1 (1974), S. 93-97 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Реактивные полиены, образуюЩиеся в термической деградации ПВХ, изомеризуются в дроцессе внутримолекыл ярной циклизации с образованием циклогексадиеновых кольцевых структур. Вследствие этого концентрация полиенов становится стационарной в ходе деградации. Зависимость концентрации полиенов от степени дегидрохлоринирринирования может быть описана с помоЩяю кинетической схемы, основанной на продессе циклизации.
    Notes: Abstract Reactive polyenes developing during the thermal degradation of PVC isomerize in an intramolecular cyclization process with the formation of cyclohexadiene ring-structures. Therefore, the concentration of polyenes reaches a steady-state value in the course of degradation. The dependence of polyene concentration on the extent of dehydrochlorination can be readily described by the kinetic treatment performed on the basis of cyclization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02075127
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of an inert solvent on the copolymerization of styrene/diethylmaleate (1980)
    Springer
    Polymer bulletin 2 (1980), S. 571-575 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We studied the effect of an inert solvent (benzene) on the overall rate of copolymerization in the system styrene/diethylmaleate (ST/DEM), initiated with azo-bis-iso-butyro-nitrile (AIBN) at 50°C. The experimental results can be interpreted on the hot radical theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255261
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanism and kinetics of the hydrochloric acid initiated polymerization of ɛ-caprolactam (1988)
    Springer
    Polymer bulletin 19 (1988), S. 547-554 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A quantitative description of the hydrochloric acid initiated polymerization of caprolactam (CL) based on the previously proposed mechanism is given. Essential parameters were identified by strategy mainly based on principal component analysis. Our kinetic model is in good agreement with experiments and describes specific features of the kinetics of the process with the suggested parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00283100
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  • 4
    Electronic Resource
    Electronic Resource
    Cross-linking and gel formation in the thermal degradation of PVC (1976)
    Springer
    Reaction kinetics and catalysis letters 5 (1976), S. 309-315 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Сшивка при термической деградации ПВХ была исследована измерением зависимости средне-числового молекулярного веса, гелевой фракции, распределения по молекулярным весам и истинной вязкости от времени деградации. Была найдена линейная зависимость между плотностью сшивки и временем реакции. Лишь одна пятая от всех образующихся полиеновых звенев принимает участие в сшивке.
    Notes: Abstract Cross-linking in the thermal degradation of PVC was investigated by measuring the dependence of number-average molecular weight, gel fraction, molecular weight distribution and intrinsic viscosity on degradation time. A linear relationship was found between the cross-linking density and reaction time. Only one fifth of the polyene sequences formed participate in the cross-linking process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02063041
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  • 5
    Electronic Resource
    Electronic Resource
    On the most significant processes of thermooxidative PVC degradation (1978)
    Springer
    Reaction kinetics and catalysis letters 8 (1978), S. 7-11 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract В термоокислительной деградации ПВХ два процесса обладают решающей важностью: выделение HCl в аллил-активированной ступени, приводящее к образованию полиеновых сегментов в полимерном скелете, и радикальное окисление этих полиенов. Два процесса тесно связаны, т. к. носители радикалов цепей окисления инициируют также последующее выделение HCl. Это приводит к повышенной скорости выделения HCl и низкой стационарной концентрации полиенов.
    Notes: Abstract In the thermooxidative degradation of PVC two processes are of decisive importance: the elimination of HCl in allyl-activated steps producing polyene sequences in the polymer backbone, and the radical chain oxidation of these polyenes. The two processes are closely interrelated as the carrier radicals of the oxidation chain initiate also sequential HCl elimination. This results in an enhanced rate of HCl elimination and a low steady-state concentration of polyenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02070339
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  • 6
    Electronic Resource
    Electronic Resource
    Oxidation of thermally degraded PVC (1976)
    Springer
    Reaction kinetics and catalysis letters 5 (1976), S. 303-307 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Пониже концентрации полиенов и скорости выделения соляной кислоты было изучено в процессе окисления порошков ПВХ, подвергнутых предварительной термодеградации. Скорость обоих процессов увеличивается с увеличением времени предварительной обработки и давления кнслорода. Была обнаружена близкая корреляция между термоокислительным быделением HC1 и окислением полиенов.
    Notes: Abstract The decrease of polyene concentration and the elimination of hydrogen chloride have been studied in the oxidation of thermally predegraded PVC powder samples. The rate of both processes increases with increasing predegradation time and oxygen pressure. The close correlation between the thermooxidative hydrogen chloride elimination and polyene oxidation has been shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02063040
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  • 7
    Electronic Resource
    Electronic Resource
    Initiated oxidation of polyenes formed in the thermal degradation of PVC (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 15 (1977), S. 853-864 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polyenes formed in the thermal degradation of PVC are readily oxidized in the liquid phase in the presence of a radical initiator. In pure oxygen at a constant rate of initiation, different length polyenes are consumed by a first-order reaction: the rate of consumption is proportional to the polyene length and to the square root of initiator concentration. Applying the relationships given by the theory of chain reactions, we determined the ratio of the rate constant of chain propagation calculated for one double bond k2 to the square root of the chain-termination rate constant k4. The value obtained, which is relatively high in comparison to other unsaturated hydrocarbons, reflects very well the high reactivity of polyenes of the degraded PVC sample towards oxidation. Intramolecular chain propagation steps are also likely to play a role in the oxidation of polyenes.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.170150408
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  • 8
    Electronic Resource
    Electronic Resource
    Kinetik der hydrolytischen Lactampolymerisation auf Grundlage der neuesten Mechanismusvorstellungen (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 739-746 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The kinetics of hydrolytic polymerization of ε-caprolactam was investigated with various initiators. The experimental results are interpreted in terms of the reaction scheme proposed earlier, which takes into account the formation and reactions of amidin groups. A kinetic model is suggested and the rate and equilibrium constants were estimated. By variation of the parameters sufficient agreement between calculated values and measured or literature data was reached.
    Notes: Die Kinetik der hydrolytischen Lactampolymerisation mit verschiedenen Initiatoren wurde untersucht. Die experimentellen Ergebnisse wurden auf Grundlage eines Mechanismus, der die Bildung und die Reaktionen der Amidinverbindungen berücksichtigt, interpretiert. Ein kinetisches Modell wird vorgestellt. Die mit diesem Modell berechneten Werte werden mit eigenen messungen und Literaturdaten verglichen. Die Geschwindigkeits- und Gleichgewichtskonstanten werden abgeschätzt. Die mit diesen Konstanten berechneten Werte zeigen eine befriedigende Übereinstimmung mit den experimentellen Werten und Literaturangaben.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010341115
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