Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 9, Issue 12
Displaying 1-13 of 13 articles from this issue
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Index
Preface : Special Issue on Tribology
Technical Note : Special Issue on Tribology
Special Lecture
Reports of International Meeting
Reports from Oversea Universities and Institutions
Original Papers
  • Bulk Polymerization of Butyl Acrylate in Co-rotating Twin Screw Extruders. Part I
    Experimental Study for Reaction Operating Conditions
    Takamasa FUKUOKA, Masashi OKABE
    1997 Volume 9 Issue 12 Pages 981-987
    Published: December 20, 1997
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.9.981
    JOURNAL FREE ACCESS
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    The continuous radical polymerization of butyl acrylate was studied using two sets of co-rotating twin screw extruder systems in order to understand the effects of operating conditions. With 2, 2′-Azobis (2, 4-dimethyl valeronitrile) as an initiator, the highest reaction conversion was obtained at a cylinder set temperature of 80°C. Both the reaction conversion and the molecular weight increased due to longer residence time when the monomer feed rate was decreased. Certain conditions of the polymerization resulted in a polymer with an average molecular weight Mw of over a million, while Mw/Mn was always from 2 to 3. The residual monomer was found to be eliminated by vacuum vent operating in a tandem extruder system which connected with the reactive extruder. Consequently, the polymerization should be performed at low temperature with the residual monomer removed by vacuum vent systems to obtain high molecular weight products.
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  • Bulk Polymerization of Butyl Acrylate in Co-rotating Twin Screw Extruders. Part II
    Simulation of Reaction Operations
    Takamasa FUKUOKA
    1997 Volume 9 Issue 12 Pages 988-994
    Published: December 20, 1997
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.9.988
    JOURNAL FREE ACCESS
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    In regard to the radical polymerization of butyl acrylate (BA) in a self-wiping co-rotating twin screw extruder, a model of the reaction kinetics and design of the reaction operations were studied. The rate constant of the reaction (kp2/kt) was determined by tracing isothermal polymerizations using a differential scanning calorimeter (DSC). Based on these kinetic parameters and the tubular reactor model, a simulator was developed. The profiles of reaction conversion, concentration of initiator, temperature, kinetic chain length in the extruder were calculated by using the simulator. Finally, the consistency of these calculations was studied by comparing with experimental data from our early work.
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