Biphasic GaIn Alloy Constructed Stable Percolation Network in Polymer Composites over Ultrabroad Temperature Region

• DOI: 10.1002/adma.202310849
• Publication Date: 2024-01-08T00:14:31Z
• Authors: Xinfeng Zhou; Yue Liu; Zijie Gao; Peng Min; Ji Liu; Zhong‐Zhen Yu; Valeria Nicolosi; Hao‐Bin Zhang
• Keywords: 0210 nano-technology; 0104 chemical sciences

AbstractFlexible and adaptable polymer composites with high‐performance reliability over wide temperature range are imperative for various applications. However, the distinct filler‐matrix thermomechanical behaviors often cause severe structure damage and performance degradation upon large thermal shock. To address this issue, a general strategy is proposed to construct leakage‐free, self‐adaptive, stable percolation networks in polymer composites over wide temperature (77–473 K) with biphasic Ga35In65 alloy. The in situ micro‐CT technology, for the first time, reveals the conformable phase transitions of Ga35In65 alloys in the polymer matrix that help repair the disruptive conductive networks over large temperature variations. The cryo‐expanded Ga compensates the disruptive carbon networks at low temperatures, and flowable Ga and melted In at high temperatures conformably fill and repair the deboned interfaces and yielded crevices. As a proof‐of‐concept, this temperature‐resistant composite demonstrates superb electrical conductivity and electromagnetic interference shielding properties and stability even after a large temperature shock (ΔT = 396 K). Furthermore, the superiority of the construction of temperature self‐adaptive networks within the composite enables them for additive manufacturing of application‐oriented components. This work offers helpful inspiration for developing high‐performance polymer composites for extreme‐temperature applications.