About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Mesoscale Phenomena in Functional Polycrystals and Their Nanostructures
|
| Presentation Title |
Mechanical Control of Nanostructures, Polarization, and Friction Anisotropy in Ferroelectric P(VDF-TrFE) Films |
| Author(s) |
Jaegyu Kim |
| On-Site Speaker (Planned) |
Jaegyu Kim |
| Abstract Scope |
The physical properties of polymer films are governed by the hierarchical organization of molecular chains. Precise control over such hierarchical structures is essential for tailoring the functionalities of the active polymer films. Here, we demonstrate the deterministic mechanical alignment of hierarchical structures in poly(vinylidene fluoride-trifluoroethylene) thin films using a large-radius (≈ 300 nm) flat-punch scanning probe microscope tip. This approach leverages a dual-stress regime that integrates large-area uniform stress with concentrated edge stress. Mechanical stress applied by the flat-punch tip drives a systematic nanostructural evolution of the semi-crystalline grains – transitioning from densification to flattening and ultimately to periodic corrugation – while simultaneously aligning in-plane polarization and friction anisotropy. This mechanical reconfiguration is facilitated by the viscoelastic mobility of amorphous and low-crystallinity regions in a rubbery state. Our approach provides a versatile framework for deterministic nanopatterning and multiscale anisotropy engineering in functional polymer systems. |