Polymer Crystallization under Process Conditions
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First, a description is given of the principles of a correct treatment of the solidification of a crystallizable body in a cooling process. As a second step, a simplified but still realistic model for primary nucleation is presented. According to this model the number of nuclei as a function of crystallization temperature is specified for i-PP and HDPE, both polymers, as rather quickly crystallizing polymers, being of industrial interest, in contrast to slowly crystallizing model polymers. Accessible paths for the determination of spherulitic growth speeds are discussed. Results are given for the above mentioned polymers. The description of the influence of flow on the crystallization kinetics of polymers is reserved for a second paper.
KeywordsCrystallization Temperature Crystallization Kinetic Isothermal Crystallization Growth Speed Increase Cool Rate
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- 4.A.W. Kolmogoroff, “On The Statistical Theory of the Crystallization in Metals” (in Russian), Isvestiya Akad. Nauk SSSR, Ser. Math. J 1, 355 (1937).Google Scholar
- 6.W. Schneider, A. Köppl and J. Berger, “Non-Isothermal Crystallization of Polymers”, Intern. Polym. Processing 2, 151 (1988).Google Scholar
- 8.D.W. van Krevelen, Crystallinity of Polymers and the Means to Influence the Crystallization Process”, Chimia 32, 279(1978).Google Scholar
- 9.L. Mandelkern, “Crystallization of Polymers”, McGraw Hill, New York (1964).Google Scholar
- 11.G. Eder; “Fundamentals of Structure Formation in Crystallizing Polymers”, in “Macromolecular Design of Polymeric Materials” Marcel Dekker, New York, K. Hatada, T. Kitayama and O. Vogl, eds., in preparation.Google Scholar
- 16.G. Eder and H. Janeschitz-Kriegl, “Heat Transfer and Flow: Transport Phenomena Controlling the Crystallization Processes in Polymers”, proceedings of the first intern, conf on “Transport Phenomena in Processing”, Honolulu, Hawaii, 22–26 march 1992, S.I. Güceri (ed.), Technomic Publ. Corp. 1993, p. 1031.Google Scholar
- 20.N. Billon, J.M. Escleine and J.M. Haudin, “Isothermal Crystallization Kinetics in a Limited Volume”, Colloid and Polym. Sei. 267, 668 (1989).Google Scholar
- 21.E. Ratajski, “Crystallization Phenomena in Quiescent Polymer Melts” (in German), Doctoral Thesis, Linz Univ., March 1993.Google Scholar