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The distribution of lamellar lengths within a spherulite
Author(s) -
Phillips P. J.,
Sien Herbert P.
Publication year - 1978
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760180411
Subject(s) - spherulite (polymer physics) , lamellar structure , crystallinity , materials science , nucleation , radius , crystal (programming language) , polymer , crystallization , crystallography , crystallization of polymers , composite material , thermodynamics , chemistry , physics , computer security , computer science , programming language
One of the problems to be considered in the application of the Halpin‐Kardos theory to crystalline polymers is the relation of the crystal length to the only related and measurable parameter, spherulite size. The number average crystal length has been computed for various two and three dimensional models for the crystallization process assuming heterogeneous nucleation. It was found that high values of crystallinity are consistent only with lamellae that are stacked in a parallel fashion. For these systems the number average lamellar length is 0.55 of the spherulite radius. Lower crystallinity polymers have an average lamellar length 0.3 to 0.5 of the spherulite radius, the actual value being determined by the radius. For spherulites of radius 1μm or greater, the size of the primary nucleus has no noticeable influence on the average lamellar length.