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Polymer with Variable Thermal Conductivity Regulated by Photoirradiation
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-07-11 , DOI: 10.1021/acsapm.3c01101 Li Wan 1 , Xin Min 2 , Wen Yue 1, 3 , FanKai Lin 2 , Jian Feng 2 , XianJie Liu 2 , Dingshun She 1, 3 , Chengbiao Wang 1 , ZhaoHui Huang 2 , Longfei Wang 4
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-07-11 , DOI: 10.1021/acsapm.3c01101 Li Wan 1 , Xin Min 2 , Wen Yue 1, 3 , FanKai Lin 2 , Jian Feng 2 , XianJie Liu 2 , Dingshun She 1, 3 , Chengbiao Wang 1 , ZhaoHui Huang 2 , Longfei Wang 4
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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.
中文翻译：
光照射调节热导率可变的聚合物
在轨紫外 (UV) 成像光谱仪 (UVIS) 的信噪比 (SNR) 可能会受到热流变化的显着影响。为了提高信噪比，需要开发具有可变导热系数的智能材料来优化热环境。在这项研究中，我们采用无毒且方便的光聚合方法合成了一种名为聚-6-(4-(苯基二氮烯基)苯氧基)己基甲基丙烯酸酯(Habpolymer)的智能材料，该材料含有光敏顺反异构基团。在绿光（525 nm）和紫外（365 nm）光照射下，观察到Habpolymer分别以反式Habpolymer和顺式Habpolymer状态存在。有趣的是，Habpolymer 的热导率在 0.35 ± 0.03（顺式-Habpolymer）和 0.78 ± 0.10 W m –1 K –1（反式-Habpolymer）。发现反式Habpolymer的高导热率状态比顺式Habpolymer高122.9%-Habpolymer。此外，光敏 Habpolymer 表现出通过光照射快速切换其热导率的卓越能力，实现了仅 10 秒的转变时间。这比电化学调制和磁场分子取向等其他方法实现的转变时间要快得多，后者慢了几十倍。基于理论机制，Habpolymer的光敏顺反异构体基团可以诱导大分子不同的空间构型，从而改变其在光照射下声子输运的热物理性质。总之，我们的结果表明 Habpolymer 在 UVIS 热控制技术中具有巨大的应用潜力。
更新日期：2023-07-11
中文翻译：
光照射调节热导率可变的聚合物
在轨紫外 (UV) 成像光谱仪 (UVIS) 的信噪比 (SNR) 可能会受到热流变化的显着影响。为了提高信噪比，需要开发具有可变导热系数的智能材料来优化热环境。在这项研究中，我们采用无毒且方便的光聚合方法合成了一种名为聚-6-(4-(苯基二氮烯基)苯氧基)己基甲基丙烯酸酯(Habpolymer)的智能材料，该材料含有光敏顺反异构基团。在绿光（525 nm）和紫外（365 nm）光照射下，观察到Habpolymer分别以反式Habpolymer和顺式Habpolymer状态存在。有趣的是，Habpolymer 的热导率在 0.35 ± 0.03（顺式-Habpolymer）和 0.78 ± 0.10 W m –1 K –1（反式-Habpolymer）。发现反式Habpolymer的高导热率状态比顺式Habpolymer高122.9%-Habpolymer。此外，光敏 Habpolymer 表现出通过光照射快速切换其热导率的卓越能力，实现了仅 10 秒的转变时间。这比电化学调制和磁场分子取向等其他方法实现的转变时间要快得多，后者慢了几十倍。基于理论机制，Habpolymer的光敏顺反异构体基团可以诱导大分子不同的空间构型，从而改变其在光照射下声子输运的热物理性质。总之，我们的结果表明 Habpolymer 在 UVIS 热控制技术中具有巨大的应用潜力。
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