Mechanical properties of polyamide-12 layered silicate nanocomposites and their relations with structure |
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Authors: | N Aït Hocine P Mdric T Aubry |
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Institution: | aLaboratoire de Rhéologie, UFR Sciences et Techniques, Université de Bretagne Occidentale, 6 avenue Victor Le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France |
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Abstract: | The mechanical properties of polyamide-12/Cloisite 30B (PA12/C30B) nanocomposites prepared by melt compounding were studied as a function of clay volume fraction φ under various processing conditions. All measured mechanical characteristics, Young's modulus, yield stress, strain at break and stress at break, exhibit a transition at φp1%, identified with a percolation threshold. Also, the linear and non-linear mechanical properties appeared to depend on the degree of exfoliation of the structure, which can be tuned by the processing conditions. The three-phase Ji's theoretical model was used to predict Young's modulus as a function of clay concentration, focusing on the influence of the degree of exfoliation. Experimental yield stress data were fitted to Pukanszky's model and discussed in terms of PA12/C30B interfacial adhesion. |
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Keywords: | Polymer Nanocomposite Mechanical properties Structure Rheology |
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