Migration of nanosilica particles in polymer blends |
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| Authors: | L. Elias F. Fenouillot J.‐C. Majesté G. Martin P. Cassagnau |
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| Affiliation: | 1. Université de Lyon 1, Lyon, F‐69003, France, CNRS UMR5223, Ingénierie des Matériaux Polymères: Laboratoire des Matériaux Polymères et Biomatériaux, F69622 Villeurbanne, France;2. Ingénierie des Matériaux Polymères: Laboratoire des Matériaux Macromoléculaires (IMP/LMM) UMR‐CNRS 5223, INSA‐Lyon, 17 Avenue Jean Capelle, 69621 Villeurbanne cedex, France;3. Ingénierie des Matériaux Polymères: Laboratoire de Rhéologie des Matières Plastiques (IMP/LRMP) UMR‐CNRS 5223, Université Jean Monnet, 23 rue du docteur Paul Michelon, 42023 Saint Etienne cedex 2, France |
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| Abstract: | Hydrophilic pyrogenic silica melt mixed in immiscible polypropylene/poly (ethylene‐co‐vinyl acetate) (PP/EVA) blend was found to migrate from the PP matrix to the EVA dispersed domains and remained confined inside them. Surprisingly, it was shown than silica was also able to migrate from a dispersed PP phase to an EVA matrix but this transfer was slower and not complete. The same silica with a hydrophobic surface treatment moved and accumulated to the blend interface and in PP. The mechanisms from which this migration proceeds are discussed. Whereas self diffusion of the particles was shown to have almost no effect, shear induced movements and collisions with dispersed drops is believed to be the most efficient mechanism. The possible trapping of silica aggregates during droplet–droplet coalescence was impossible to observe but is thought to be a possible additional mechanism. No quantification on the relative importance of the latter phenomenon can be drawn at the moment. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 1976–1983, 2008 |
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| Keywords: | blends migration nanoparticles silicas |
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