Figure 4
From: Multifunctional Polymer-Based Graphene Foams with Buckled Structure and Negative Poisson’s Ratio
Optical images of the LED lights under the stretching of foams: (a) PA foams; (b) A-PA foams; (c) PA-foams with notch; (d) A-PA foams with notch. (e,f) Schematic illustration of possible crack propagating mechanism of PA foams and crack resisting mechanism of A-PA foams.
