While Dynamic Mechanical Analysis (DMA) is a tried and true method for obtaining frequency-dependent viscoelastic properties of macroscale behavior in soft materials and composites, measuring local polymer viscoelastic properties (including the interphase) is a much greater challenge. Using only commonly available capabilities of AFMs, we developed a method for fast, high-resolution (~15nm) spatial mapping local viscoelastic properties in heterogeneous soft, adhesive materials. We demonstrated this ‘nano-DMA’ technique using three AFM instruments, producing master curves spanning an unprecedented 5 decades in frequency range in two different elastomers, validated by macroscale testing through traditional DMA.
Active Researcher on the Project:
 Pavan V. Kolluru, Matthew D. Eaton, David W. Collinson, Xu Cheng, David E. Delgado, Kenneth R. Shull, and L. Catherine Brinson
Macromolecules 2018 51 (21), 8964-8978. https://doi.org/10.1021/acs.macromol.8b01426