Abstract
A new counting technique for nuclei, as found after short-term shearing, has been developed with the aid of the plate-and-plate rheometer Linkam CSS450. For the purpose this apparatus was modified by the introduction of complementary polarizing optics (a polarizer and a λ-plate). With the aid of this technique the density of nuclei could be determined in a new way. When these number densities are plotted against the applied specific work, satisfactory agreement is found with results, which have been obtained previously with a sliding glass plate rheometer. Nevertheless, the limits of validity of the diagrams had to be discussed. A transition from a dynamic description with the aid of the specific work to a purely kinematic description with the aid of the frequency of successful encounters cannot be overlooked. In fact, with increasing specific work the influences of temperature and (non-Newtonian) viscosity appear to fade away.
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Acknowledgment
This study was carried out in the course of activities sponsored by the Austrian Science Foundation FWF under contract no. P 21228-N14.
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Ratajski, E., Janeschitz-Kriegl, H. Flow-induced crystallization in polymer melts: on the correlation between nucleation and specific work. Polym. Bull. 68, 1723–1730 (2012). https://doi.org/10.1007/s00289-011-0688-4
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DOI: https://doi.org/10.1007/s00289-011-0688-4