The Influence of Blend Morphology (Co-Continuous or Sub-Micrometer Droplets Dispersions) on the Nucleation and Crystallization Kinetics of Double Crystalline Polyethylene/Polyamide Blends Prepared by Reactive Extrusion

Reactive blending of functionalized polyethylenes (PE) and polyamides (PA) is performed by carefully choosing extrusion conditions and polymeric materials in order to obtain two types of stable morphologies. The first blend type yields a co‐continuous morphology and the second type a dispersion of s...

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Bibliographic Details
Published in:Macromolecular chemistry and physics 2011-07, Vol.212 (13), p.1335-1350
Main Authors: Córdova, Miguel E., Lorenzo, Arnaldo T., Müller, Alejandro J., Gani, Léa, Tencé-Girault, Sylvie, Leibler, Ludwik
Format: Article
Language:English
Subjects:
Applied sciences
Crystallization
crystallization kinetics
Exact sciences and technology
fractionated crystallization
homogeneous nucleation
Organic polymers
Physicochemistry of polymers
polyamide droplets
polyethylene/polyamide blends
Properties and characterization
superficial nucleation
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Summary:Reactive blending of functionalized polyethylenes (PE) and polyamides (PA) is performed by carefully choosing extrusion conditions and polymeric materials in order to obtain two types of stable morphologies. The first blend type yields a co‐continuous morphology and the second type a dispersion of sub‐micron droplets of the PA phase in a PE matrix. The crystallization kinetics of the PA change from a sigmoidal classical type (for the co‐continuous blend) to first‐order kinetics in the case of the sub‐micron PA droplets. The results demonstrate an intimate relationship between blend morphology and nucleation and crystallization kinetics of the blend components. When the polyamide component is confined into a large number of isolated sub‐micrometer droplets, the nucleation mechanism changes to a superficial nucleation with first‐order kinetics and an Avrami index close to 1. If a degree of percolation is provided by the co‐continuous morphology, a heterogeneous nucleation and sigmoidal crystallization kinetics are found.
ISSN:1022-1352
1521-3935
DOI:10.1002/macp.201100039