Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 10, Pages 12748-12757Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c02195
Keywords
lignin; polyamide elastomer; composites; mechanically strong; photoresponsive actuator
Funding
- Anhui province Natural Science Research Project for university [KJ2021A0165]
- National Natural Science Foundation of China [32171719]
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In this study, a lignin-based photoresponsive actuator was successfully prepared by blending castor oil-derived polyamide elastomers with lignin. With the aid of castor oil, the actuator achieved significant light-driven contraction within a short period of time. Furthermore, the composite material also demonstrated the ability to undergo dynamic bending in multiple directions and was used to power a thermoelectric generator.
The fabrication of biobased smart materials from renewable biomasses is of great importance for sustainable development. Although lignin possesses photothermal conversion potential, the development of lignin-based actuators with large contraction and fast photoresponse has various hurdles. Herein, simply by blending with castor oil-derived polyamide elastomers, a lignin-based photoresponsive actuator can be obtained, which accomplishes up to 18% light-driven contraction under loading within 3 s. The crystals in polymer matrix serve as switch segments, firmly locking the stress-induced strain energy, which is swiftly released due to photothermal processes and induced a huge contraction. The composite, LP4-50, can contract and induce dynamic bending in multiple directions when irradiated locally with a near-infrared 808 nm laser. Furthermore, at standard 1 sun irradiation (100 mW/cm(2)), LP4-50 was successfully employed to power a thermoelectric generator. This strategy establishes the groundwork for further research into the photothermal characteristics of lignin and encourages new applications in stimulus-responsive actuators.
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