Abstract
The migration of clay particles during mixing of organically montmorillonite polyethylene/polyamide nanocomposites was investigated. Special attention was paid to the observation of PA droplet morphology establishment as well as clay localization and exfoliation at different mixing times. During the incorporation step in internal mixer, the simultaneous mixing of all components favors the presence of a great number of micrometric clay agglomerates within the matrix. The migration of clay particles from the polyethylene (PE) matrix towards the polyamide (PA) dispersed phase is a very short process that takes about 1 min. From the beginning of the dispersion step (~2 min), clay particles are exclusively localized at the PA droplet frontier. Then, they are sheared and redistributed, forming a nanometric interphase. The correlation between droplet morphology establishment and clay migration mechanisms until the formation of a developed interphase is discussed.
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