4D printable and recyclable two-way shape memory butadiene rubber as ultrasensitive, longer-lasting, and lower-cost fire warning sensors

Document Type

Article

Publication Date

11-15-2024

Abstract

Fire sensors have been widely used for early warning of fire in confined space in buildings. However, the currently used fire sensors cannot achieve high sensitivity, long service life, and low cost at the same time. In this work, 4D printable and recyclable two-way shape memory polymers (2 W-SMPs), which are made of a butadiene rubber (P-80), have been designed for fire warning sensor with ultra-high sensitivity, longer-lasting service life, and lower-cost. The P-80 displays a high reversible actuation with a crystallization-induced elongation (CIE) and a melting-induced contraction (MIC) as large as 99.3 % and 90.4 %, respectively. The designed fire sensor exhibits an average respond time as fast as 0.2 s and can be reused for more than 20 times. The mechanism for the excellent two-way shape memory effect and recyclability of the P-80 has been revealed. The entropy and enthalpy increase is the primary reasons for the large MIC in P-80, which contributes to 76.1 % and 23.9 % of MIC, respectively. The recyclability of the P-80 is caused by the reconstruction of C = C bond via olefin metathesis reaction, resulting in the dynamic topology reformation. This work provides a guideline for development of 4D printable and recyclable 2 W-SMPs.

Publication Source (Journal or Book title)

Chemical Engineering Journal

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