Tongxi Yu

Toughening high performance ultrahigh molecular weight polyethylene using multiwalled carbon nanotubes

Abstract We report experimental observations on the drastically enhanced toughness in the high-strength and high-modulus ultrahigh molecular weight polyethylene (UHMWPE) films due to the addition of 1xa0wt% multiwalled carbon nanotubes (MWCNTs). A combination of tensile and Raman spectroscopic measurements showed that the presence of MWCNTs in the composites can lead to a ∼150% increase in strain energy density in comparison with the pure UHMWPE film at similar draw ratios. This is accompanied with an increase of ∼140% in ductility and up to 25% in tensile strength. We attribute the above observations to the chain mobility enhancement in UHMWPE induced by the MWCNTs.

High-performance ballistic protection using polymer nanocomposites

Abstract: In this chapter, we will demonstrate how nanotechnology can assist the design of super-strong fibers for ballistic armor applications. The organization of the chapter is as follows. First, an overview of the latest developments in reinforcing polymer nanocomposite fibers will be presented. Then a fundamental review of nanotechnology principles and how molecular design can assist the alignment of nanofillers in polymeric fibers will be discussed. This is followed by examples of application of the super-strong polymeric nanocomposite fibers in body armors. Comparisons with various fibers used in ballistic-proof armors will also be presented. Further, we will provide an insight into the limitations of current technology as well as an outlook on future development in super-strong fiber technology. Finally, a survey of various sources of materials will be provided for further details.