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  • 1980-1984  (12)
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  • 1
    Electronic Resource
    Electronic Resource
    Lewis acid initiated melt reactions of polystyrene and EPDM rubber (1984)
    Springer
    Polymer bulletin 12 (1984), S. 157-163 
    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 In order to obtain high impact polystyrene (PS), experiments have been performed on coupling of EPDM rubber and PS in the mixing chamber of a HAAKE plastograph. Lewis acids were added to the melt and the torque increase observed by their addition proved that chemical reactions take place in the system. During the reaction, the rubber proved to be more active, it became crosslinked and/or it was coupled with the PS molecules. Only a small fraction of the PS present coupled to the rubber molecules. No significant degradation process could be detected. Mechanical properties (tensile modulus and strength) improved during the reaction. This can be interpreted by the increased solubility of the coupled rubber molecules in the continuous PS phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263339
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  • 2
    Electronic Resource
    Electronic Resource
    A new correlation between molecular parameters and physical properties of chlorobutyl rubbers grafted with polystyrene branches (1981)
    Springer
    Polymer bulletin 4 (1981), S. 437-443 
    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 series of chlorobutyl rubbers grafted with polystyrene branches have been prepared and backbone length, branch density and segment lengths between branches were calculated from the overall graft composition, number average molecular weight, and branch molecular weight. Analysis of the deformation process revealed unexpected correlations between the molecular parameters and tensile properties of the graft: the tensile strength is directly, and the elongation at break inversely proportional to the ratio of branch molecular weight to the molecular weight of segments between the branches. Further, the tensile strength and elongation at break are proportional to the molecular weight of the backbone. A general correlation was found between the backbone molecular weight and the specific breaking energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255698
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  • 3
    Electronic Resource
    Electronic Resource
    Cationic reactions in the melt (1981)
    Springer
    Polymer bulletin 5 (1981), S. 469-476 
    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 The effect of Lewis acids of different acidities, i.e., AlCl3 and Bu2SnCl2, on polystyrene melt has been investigated using the mixing chamber of a Brabender Plastograph at 180°C. The torque was monitored as a function of time and molecular weights of periodically withdrawn samples were determined. The structure of select samples has-been analyzed by 1H-NMR spectroscopy. A sequence of complex physical and chemical transformations has been identified. The addition of Lewis acids to polystyrene melts causes an immediate drastic decrease in the torque due to rapid partial polymer degradation which is followed by homogenization and a slower degradation phase. There is evidence for the formation and accumulation of unsaturation during degradation. Cationic reactions induced by the Lewis acids readily explain the observed sequence of chemical transformations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255985
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  • 4
    Electronic Resource
    Electronic Resource
    Cationic reactions in the melt (1982)
    Springer
    Polymer bulletin 6 (1982), S. 327-333 
    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 The effect of Lewis acids on various ethylene-propylene co- and terpolymers has been investigated in the mixing chamber of a Brabender Plastograph at 180°C. Fast degradation of the polymers was observed upon the addition of Lewis acids. Terpolymers containing unsaturations undergo crosslinking: the structure of the third monomer (diene) determines the rate of crosslinking and the characteristics of the crosslinked materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255406
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  • 5
    Electronic Resource
    Electronic Resource
    Cationic reactions in the melt (1982)
    Springer
    Polymer bulletin 6 (1982), S. 335-341 
    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 Reactions in the melt between polystyrene and ethylene propylene co- and terpolymers were studied in the presence of anhydrous AlCl3 using the mixing chamber of a Brabender Plastograph as the reactor. Various concurrent reactions have been identified, i.e., grafting, degradation, crosslinking, etc., the rates of which depend on the nature of the polymers and of the AlCl3 added. Grafting is extensive, 40–50%, and the composition of the grafts is close to that of the charge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255407
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  • 6
    Electronic Resource
    Electronic Resource
    Processability of rigid poly(vinyl chloride) compounds I. Evaluation of extrusiometer data (1984)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 6 (1984), S. 2-7 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The results of the extrusiometer measurements made on a great number of different rigid poly(vinyl chloride) (PVC) compositions are analyzed. The laboratory extruders used in the experiments can be considered to be isothermic. The output rate is proportional to the extrusion speed and almost independent of the composition. The other characteristics - torque, die and back pressure - significantly depend on the composition of the compounds. The back pressure proved to be proportional to the die pressure, and thus does not give additional information. Processability is well characterized by the dissipated energy which can be calculated from the difference of the total introduced mechanical energy and the energy required to transport the melt through the capillary. The dissipated energy is closely related to the fusion characteristics of the compounds.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730060103
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  • 7
    Electronic Resource
    Electronic Resource
    Processability of rigid PVC compounds II. Comparions of extrusiometric and mixing head data. Effect of composition variables (1984)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 6 (1984), S. 8-12 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Various formulations of unplasticized PVC dry blends were investigated by extrusiometer and laboratory batch mixer (mixing chamber). Torque versus time curves of the mixing chamber experiments were characterized by three, essentially independent data: fusion time, equilibrium torque, and stability time, corresponding to the three distinct phases of the processing. Fair correlation was found between fusion characteristics of the compound and the energy required for its processing in the extrusiometer. The effect of composition on extrusiometric and mixing chamber data was investigated by multiple linear regression technique. The results allow prediction of the effect of recipe changes.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730060105
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  • 8
    Electronic Resource
    Electronic Resource
    Comparison of dynamic and static degradation of poly(vinyl chloride) (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 2615-2623 
    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: The thermal degradation of PVC was measured under dynamic and static conditions. The UV and IR spectra, as well as the molecular weight distribution of the PVC samples, taken after different time intervals were measured. It was established that during the dynamic PVC degradation, performed in a mixing chamber, two stages with different degradation rates can be distinguished both in extinction and torque vs. time curves. While oxygen does not, dissolved HCl does play an important role in the dynamic degradation: HCl steps into reaction with the formed polyenes and has a catalytic action. The chemical degradation, particularly the crosslinking, produces the changes in the rheological behavior of the material. Results were compared with those obtained under static conditions in argon, air, and HCl atmosphere.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270730
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  • 9
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    Unknown
    A new correlation between molecular parameters and physical properties of chlorobutyl rubbers grafted with polystyrene branches (1981)
    Springer
    Details
    Publication Date: 1981-01-01
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 10
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    Cationic reactions in the melt (1982)
    Springer
    Details
    Publication Date: 1982-01-01
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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