An Analysis of Transcrystallinity in Polymers

Abstract : Polymer crystallization often occurs in the presence of foreign bodies, such as walls of processing tools. In such cases, there is a competition between nucleation in the bulk polymer and nucleation on well-identified surfaces. If many nuclei are activated at the surfaces, their proximity imposes that entities emanating from these nuclei grow preferentially normal to the surfaces, leading to transcrystalline zones. The competition between surface and bulk nucleation can be studied through crystallizations of thin polymer films in contact with pan surfaces in a DSC apparatus. These experiments show that in thin samples transcrystallinity is limited by sample thickness. When thickness increases, the transcrystalline zones can grow, but up to a limiting value, because at a certain stage their development is stopped by the growth of bulk spherulites. A specific analysis of these DSC experiments gives access to crystallization parameters such as the number of nuclei per unit surface or the growth rate, and makes it possible to determine the crystallization kinetics of the polymer not disturbed by transcrystallinity.
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Lionel Freire, Christelle Combeaud, Noëlle Billon, Jean-Marc Haudin. An Analysis of Transcrystallinity in Polymers. Polymer processing with resulting morphology and properties: Feet in the Present and Eyes at the Future, Oct 2015, Salerno, Italy. pp.020010 - ISBN: 978-0-7354-1342-9, ⟨10.1063/1.4937288⟩. ⟨hal-01253935⟩

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