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SEM images of 3D-printed porous structures. Networking between the silicone particles can be observed, which is formed by the printed binder dissolving the PVB coating on the silicone particles and subsequently evaporating and leaving behind a solid PVB network. (a) Nonvolatile ratio 5%. (b) Nonvolatile ratio 20%. (c) Polymer coating ratio 8%. (d) Polymer coating ratio 20%.
