This paper investigates the thermomechanical formation and recovery of nanometer-scale indents in a shape memory polymer (SMP), studied using a heated atomic force microscope (AFM) tip and hot-stage atomic force microscopy. The material tested is a tert-butyl acrylate (tBA)-based polymer, which has a glass transition temperature of 60°C. The AFM tip forms indents in the polymer in the temperature range 25-250°C. The shape recovery of the indents is studied while the polymer is heated up to 100°C. The temperature required for complete annealing of the indents depends upon the indentation formation conditions, with higher temperature formation corresponding to higher temperature recovery.
- Heated atomic force microscope cantilever
- Nanoscale indentation
- Shape memory polymers
- Strain storage and recovery
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics