A Hybrid Syntactic Foam-Based Open-Cell Foam with Reversible Actuation
Herein, we report the first hybrid open-cell foam with revisable actuation. Open-cell foams with revisable actuation are favoable for many applications. However, it is challenging to fabricate such open-cell foams with very low density. This study presents a novel concept of creating hybrid two-way (2W) shape memory open-cell foams using two-way shape-memory-polymer-based syntactic foams as the matrix. Previously, a syntactic foam prepared by incorporating hollow glass microbubbles in the cross-linked semicrystalline -poly(1,4-butadiene) (cPBD) was proved to have enhanced strength and specific energy output compared to the neat cPBD. Here, the same syntactic foam was used as the matrix, and the open-cell structure was produced by the salt-leaching method. The hybrid foam exhibits very attractive properties, including reversible actuation strain up to 50%, density as low as 0.07 g/cm, energy output up to 0.23 J/g, tensile strength up to 0.84 MPa, elongation at break as high as 339%, high thermal stability with peak decomposition temperature at 450 °C, and Joule heating and strain sensing capabilities. The tensile strength and stiffness are shown to follow the well-known Gibson-Ashby model for porous materials. Combining the open-cell structure with the reversible actuation and other functionalities enables numerous potential applications for the prepared hybrid foam, including adjustable filters, insulators, sealers, and smart scaffolds.
Publication Source (Journal or Book title)
ACS applied materials & interfaces
Sarrafan, S., & Li, G. (2022). A Hybrid Syntactic Foam-Based Open-Cell Foam with Reversible Actuation. ACS applied materials & interfaces, 14 (45), 51404-51419. https://doi.org/10.1021/acsami.2c16168