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Licensed Unlicensed Requires Authentication Published by De Gruyter September 9, 2013

Previous Experimental Polymer Rheology Versus Flow Induced Crystallization

  • H. Janeschitz-Kriegl

Experimental results, which have mostly been obtained with the aid of flow birefringence, are quoted. For a series of polystyrenes insights are obtained into the adjustment times for steady flow. For shear rates of practical interest these times are extremely short compared with the times showing up in the relaxation time spectrum. The question arises, whether this spectrum can still be of influence. Measurements on polyethylenes are quoted, which are in agreement. But this means that, fortunately, in capillary rheometry mostly the steady state viscosity is measured. This statement also holds for duct flow, which has often been used for the investigation of shear induced crystallization, in particular on polypropylenes. The linear stress optical rule is recalled. It reflects the persistence of an internal equilibrium, which breaks down only at high enough shear rates. This equilibrium seems to hold for the random flight statistics of chain segments connecting entanglements. The mentioned adjustment times are already short, before the said break down occurs.


2 Mail address: Hermann Janeschitz-Kriegl, Institute of Polymer Science, Johannes Kepler University, A-4040 Linz, Austria, E-mail:

References

DoiM., EdwardsS. F.: The Theory of Polymer Dynamics, Oxford Univ. Press, Oxford (1986)Search in Google Scholar

EderG., Janeschitz-KrieglH., KrobathG., “Shear Induced Crystallization, A Relaxation Phenomenon in Polymer Melts”, Progr. Coll. Polym. Sci., 80, 17 (1989)10.1007/BFb0115407Search in Google Scholar

GortemakerF. H., HansenM. G., De CindioB., Janeschitz-KrieglH., “A Re-designed Cone-And-Plate Apparatus for the Measurement of Flow Birefringence of Polymer Melts”, Rheol. Acta, 15, 242255 (1976)10.1007/BF01521125Search in Google Scholar

GortemakerF. H., HansenM. G., De CindioB., LaunH. M., Janeschitz-KrieglH., “Flow Birefringence of Polymer Melts: Application to the Investigation of Time Dependent Rheological Properties”, Rheol. Acta, 15, 256267 (1976)10.1007/BF01521126Search in Google Scholar

Janeschitz-KrieglH., “Flow Birefringence of Elastico-viscous Polymer Systems”, Adv. Polym. Sci., 6, 170318 (1969)10.1007/BFb0051073Search in Google Scholar

Janeschitz-KrieglH.: Polymer Melt Rheology and Flow Birefringence, Springer Verlag, Berlin, Heidelberg, New York (1983)10.1007/978-3-642-68822-5Search in Google Scholar

Janeschitz-KrieglH.: Crystallization Modalities in Polymer Melt Processing, Springer Verlag, Wien, New York (2010)10.1007/978-3-211-87627-5Search in Google Scholar

Janeschitz-KrieglH., RatajskiE., “Some Fundamental Aspects of the Kinetics of Flow-induced Crystallization of Polymers”, Colloid. Polym. Sci., 288, 15251537 (2010)10.1007/s00396-010-2266-ySearch in Google Scholar

LaunH. M., “Elastic Properties of Polethylene Melts at High Shear Rates with Respect to Extrusion”, Rheol. Acta, 21, 464469 (1982)10.1007/BF01534320Search in Google Scholar

LemstraP. J., Van AerleN. A. J. M., BastiaansenC. W. M., “Chain-extended Polyethylene”, Polm. J., 19, 8598 (1987)10.1295/polymj.19.85Search in Google Scholar

LiedauerS., EderG., Janeschitz-KrieglH., JerschowP., GeymayerW., IngolicE., “On the Kinetics of Shear Induced Crystallization in Polypropylene”, Intern. Polym. Proc., 8, 236244 (1993)Search in Google Scholar

LodgeA. S.: Elastic Liquids, Academic Press, London (1964)Search in Google Scholar

StrattonR. A., “The Dependence of Non-Newtonian Viscosity on Molecular Weight for Monodisperse Polystyrene”, J. Coll. Interf. Sci., 22, 517530 (1966)10.1016/0021-9797(66)90047-6  Search in Google Scholar

Van AkenJ. A., GortemakerF. H., Janeschitz-KrieglH., LaunH. M., “Quasi-linear Rheological Behavior of Polymer Melts: Comparison between Mechanical and Improved Flow Birefringence Measurements”, Rheol. Acta, 19, 159167 (1980)10.1007/BF01521927Search in Google Scholar

Van MeerveldJ., PetersG. W. M., HütterM., “Towards A Rheological Classification of Flow Induced Crystallization Experiments of Polymer Melts”, Rheol. Acta, 44, 119134 (2004)10.1007/s00397-004-0382-7Search in Google Scholar

WagnerM., ÖttingerH. Ch., DealyJ., “Joachim Meissner, 1929-2011”, Rheol. Bull., 80, 1415, (2011)Search in Google Scholar

WalesJ. L. S.: The Application of Flow Birefringence to Rheological Studies of Polymer Melts, Delft University Press, Delft (1976)10.1007/978-94-010-1556-1Search in Google Scholar

ZhengR., TannerR. I., FanX.: Injection Molding, Springer Verlag, Heidelberg, New York (2011)10.1007/978-3-642-21263-5Search in Google Scholar

Received: 2012-8-7
Accepted: 2012-12-20
Published Online: 2013-09-09
Published in Print: 2013-07-01

© 2013, Carl Hanser Verlag, Munich

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