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Percolation implications in the rheology of crystallization

Published

Author(s)

Anthony P. Kotula, Kalman D. Migler

Abstract

The rheology of polymer crystallization is an old problem that often defies explanation due to the complex interrelationships between crystallization and flow properties. Although separate measurements of rheology and crystallinity can give some information on their relationship, it is only through simultaneous measurements that coherent ideas on the rheology of polymer crystallization can be formed. This Perspective details recent experimental developments in simultaneous crystallinity and rheology measurements as well as continuum modeling efforts for the case of quiescent and isothermal crystallization. Experimental results reveal that the rheology is dominated initially by growth of individual spherulites that evolve into spherulitic superstructures that eventually span the measurement geometry. A generalized effective medium model based on this concept of percolation can explain both the growth of the viscoelastic modulus during crystallization and the changes in the relaxation spectrum of the crystallizing polymer, including a critical gel response at percolation. The success of the combined measurement techniques and percolation concepts motivate research to extend the semicrystalline polymer materials space where these methods are applied as well as further develop novel techniques to gain additional insight into the evolution of structure and relaxation dynamics during crystallization.
Citation
Polymer Crystallization

Keywords

Rheology, polymer crystallization

Citation

Kotula, A. and Migler, K. (2020), Percolation implications in the rheology of crystallization, Polymer Crystallization, [online], https://doi.org/10.1002/pcr2.10162 (Accessed April 22, 2021)
Created October 25, 2020, Updated October 26, 2020