Polymer with Variable Thermal Conductivity Regulated by Photoirradiation AITranslate

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DOI：https://doi.org/10.1021/acsapm.3c01101

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The signal-to-noise ratio (SNR) of on-orbit ultraviolet (UV) imaging spectrometers (UVIS) can be significantly impacted by variations in heat flows. To improve SNR, it is necessary to develop intelligent materials with variable thermal conductivity to optimize the thermal environment. In this study, we synthesized an intelligent material called poly-6-(4-(phenyldiazenyl)phenoxy)hexyl methacrylate (Habpolymer), which contains photosensitive cis–trans isomeric groups, using a nontoxic and convenient photopolymerization method. Under green (525 nm) and UV (365 nm) photoirradiation, Habpolymer was observed to exist in trans-Habpolymer and cis-Habpolymer states, respectively. Interestingly, the thermal conductivity of Habpolymer reversibly switched between 0.35 ± 0.03 (cis-Habpolymer) and 0.78 ± 0.10 W m–1 K–1 (trans-Habpolymer). The high thermal conductivity state of trans-Habpolymer was found to be 122.9% higher than that of cis-Habpolymer. Furthermore, the photosensitive Habpolymer demonstrated a remarkable ability to rapidly switch its thermal conductivity through photoirradiation, achieving a transition time of just 10 s. This was significantly quicker than the transition times achieved by other methods such as electrochemical modulation and magnetic field molecular orientation, which were dozens of times slower. Based on theoretical mechanisms, the photosensitive cis–trans isomer groups of Habpolymer can induce different spatial configurations of macromolecules, which in turn can change the thermophysical properties of their phonon transport under photoirradiation. In conclusion, our results demonstrate that Habpolymer has great potential for use in thermal control technology for UVIS.