Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 21, Issue 12
Displaying 1-12 of 12 articles from this issue
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Index
Preface
Technical Notes : Special Issue on Contamination control technologies for polymer processing
Technical Report
Report from Overseas
Topic on Products and Technologies
Visiting Active Companies
Original Papers
  • Alteration in Rheological Properties of Polyethylene by Extrusion Processing
    Kazuya Ono, Masayuki Yamaguchi
    2009 Volume 21 Issue 12 Pages 745-752
    Published: 2009
    Released on J-STAGE: May 20, 2010
    DOIhttps://doi.org/10.4325/seikeikakou.21.745
    JOURNAL FREE ACCESS
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    The effect of processing temperature in a single-screw extruder on molecular characteristics of polyethylene (PE) was studied by employing additive-free low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE) for extrusion coating. It was indicated that melt elasticity is enhanced by applied extrusion processing at high temperature, suggesting that long-chain branches are generated by cross-linking reaction. On the contrary, thermal analyses revealed that there is no change in the distribution of short-chain branches by extrusion processing. Further, chain scission of PE took place predominantly above 320°C. Meanwhile at low temperature, the processing history decreased the melt elasticity. This is attributed to shear modification phenomenon.
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