Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 32, Pages 27308-27315Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b08503
Keywords
3D printing; azobenzene; poly(siloxanes); smart materials; photoactivated; bilayer
Funding
- NSF [CMMI- 1538318]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1538318] Funding Source: National Science Foundation
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4D printing is an emerging additive manufacturing technology that combines the precision of 3D printing with the versatility of smart materials. 4D printed objects can change their shape over time with the application of a stimulus (i.e., heat, light, moisture). Light driven smart materials are attractive because light is wireless, remote, and can induce a rapid shape change. Herein, we present a method for fabricating polymeric bilayer actuators via 3D printing which reversibly change their shape upon exposure to light. The photoactive layer consists of a poly(siloxane) containing pendant azobenzene groups. Two different photoactive polymers were synthesized, and the photomechanical effect displayed by the bilayers was evaluated. These bilayers exhibit rapid actuation with full cycles completed within seconds, and photo generated stresses ranging from 1.03 to 1.70 MPa.
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