Rheologica Acta

, Volume 51, Issue 11–12, pp 979–989 | Cite as

Rheological properties of electron beam-irradiated polypropylenes with different molar masses

  • Dietmar Auhl
  • Florian J. Stadler
  • Helmut MünstedtEmail author
Original Contribution


Electron beam-irradiated polypropylene undergoes chain scission initiated by the loss of a proton. The resulting macroradicals can lead to branched molecules. However, the understanding of the influence of irradiation on the branching of polypropylene is still scarce. Therefore, this paper investigates structure–property relationships in such irradiated polymers. In general, irradiation yields long-chain branches, which develop from a star-like into a tree-like branching architecture with increasing dose. These conclusions can be drawn from the relation between the zero shear-rate viscosity η 0 and the weight average molar mass M w as well as from the elongational behavior.


Polypropylene Electron beam irradiation Long-chain branching Zero shear-rate viscosity Elongational rheology 



The authors would like to thank the German Research Foundation (DFG) and “Human Resource Development (Advanced track for Si-based solar cell materials and devices, project number 201040100660)” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korean Ministry of Knowledge Economy for financial support of this work. The contributions of J. Kaschta and I. Herzer (University Erlangen-Nürnberg) to the SEC-MALLS measurements as well as useful discussions with Dr. J. Stange, Dr. B. Derfuss (University Erlangen-Nuremberg), and S. Henning (MLU Halle-Wittenberg) are gratefully acknowledged. The electron beam irradiation was performed at the Leibniz-Institute of Polymer Research Dresden within a project performed together with Dr. B. Krause, Dr. U. Lappan, and Prof. Lunkwitz sponsored by the German Research Foundation (DFG).


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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Dietmar Auhl
    • 1
    • 2
  • Florian J. Stadler
    • 1
    • 3
  • Helmut Münstedt
    • 1
    Email author
  1. 1.Institute of Polymer MaterialsFriedrich-Alexander University Erlangen-NürnbergErlangenGermany
  2. 2.Bio- and Soft Matter, Institute of Condensed Matter and NanosciencesUniversité Catholique de LouvainLouvain-La-NeuveBelgium
  3. 3.School of Semiconductor and Chemical EngineeringChonbuk National UniversityJeonjuRepublic of Korea

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