Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5202200 | Polymer Degradation and Stability | 2013 | 12 Pages |
Abstract
We have investigated the influence of talc on the rheological, chemical, thermal and mechanical properties of polypropylene (PP)/talc composites (talc content was 0Â wt.%, 10Â wt.% and 20Â wt.%) during multiple re-extrusions. In particular, the materials were extruded and re-extruded after a mechanical grinding of the extrudates for up to six times and then injected to make tensile sample. The main results show the reprocessing of the blends induced thermo-mechanical degradation by chain scission without significant oxidation. Re-extrusion induced a significant decrease of talc particles size and an increase of their aspect ratio. This mechanism caused an increase of rigidity whose intensity increased with the content of talc, and overcame the loss of rigidity due to the thermo-mechanical degradation of PP. The yield stress was stable for PP/talc 80/20 (20Â wt.% talc) but increased for PP/talc 90/10 (10Â wt.% talc) with the re-extrusion number, while that of neat PP increased for the first re-extrusion and then decreased for higher number of re-extrusions. Therefore, talc has a positive effect on the mechanical properties of PP/talc composites during re-extrusion.
Related Topics
Physical Sciences and Engineering
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Authors
K. Wang, N. Bahlouli, F. Addiego, S. Ahzi, Y. Rémond, D. Ruch, R. Muller,