Polymer composites containing nano-additive reinforcements have attracted much attention in recent years, enabling tunable properties that benefit certain material applications. In the present work, polyurethane-based nanocomposites were prepared with natural halloysite nanotubes, a clay mineral with the empirical formula Al2Si2O5(OH)4. Mechanical properties of the polymer nanocomposite system are investigated under quasi-static loading and high-strain-rate conditions. Under static loading, the nanocomposite presents an elastomeric behaviour, while under dynamic loading, a glassy-like response. Given that halloysite nanotubes can be uniformly dispersed at the polyurethane matrix, the interference of the nanotubes on polyurethane's fracture behaviour is investigated. Halloysite was incorporated into polypropylene glycol, tolylene 2,4-diisocyanate based polyurethane, with 4,4'-methylenebis(2-chloroaniline) as a curative. The reinforcement of the polymer is seen through comparisons of the ultimate tensile strength, strain to failure and spall strength between the pristine and nanocomposite polymer. Samples recovered from spall testing are examined via SEM to explore the fracture mechanism and halloysite dispersion.

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