Surface Functionalization of Halloysite Nanotubes for Polyamide 6 Composites
Halloysite nanotubes are predestinated for the reinforcement of thermoplastic polymers because of their cylindrical geometry with high aspect ratio. The mineral halloysite occurs in large natural deposits and its use would therefore contribute to sustainable development of materials with enhanced mechanical properties. Generally, it is unproblematic to improve the tensile strength and modulus of reinforced materials, while maintaining or particularly increasing impact properties is critical. In order to improve the adhesion and the ductility, functionalization of the filler surface is often necessary. In this work, we discuss several strategies of surface modification of halloysite. These modified halloysite fillers were used for preparation of polyamide 6 composites. Nanocomposites with halloysite modified with octadecyldimethylchlorosilane showed the best mechanical performance, although a nanometric dispersion of the tubes was not achieved.
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