Edagawa Aya, Matsuda Satoru, Kawakubo Hirofumi, Imai Hiroaki, Oaki Yuya
Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
Department of Surgery, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.
ACS Appl Mater Interfaces. 2022 Sep 28;14(38):43792-43801. doi: 10.1021/acsami.2c12909. Epub 2022 Sep 3.
Dynamic properties are derived from the structural flexibility of 2D polymers. Softening layered structures has the potential for tuning and enhancing the dynamic properties. In the present work, the flexibility of layered polydiacetylene (PDA) is tuned by the interlayer polymeric guests with different branching structures. PDA shows thermoresponsive color-change properties through shortening the effective conjugation length with molecular motion. Whereas the blue-to-red color transition is observed at certain threshold temperatures for the layered PDA without the interlayer guest, the intercalation of the bulky polymer guests lowers the starting temperature and widens the temperature range for the thermoresponsive color changes. The resultant layered composite of PDA and bulky polymer affords the homogeneous coating on substrates on the centimeter scale. The thermoresponsive color-change coating is applied to temperature-distribution imaging. The specific heat of liquids is colorimetrically estimated using the coating on the bottle. The coating on a silk cloth visualizes the temperature distribution on a simulated tissue during surgical operation using an ultrasonic coagulation cutting device. The coating can be applied to thermal imaging in a variety of fields. Moreover, the softening strategy contributes to explore dynamic properties of soft 2D materials.
动态特性源自二维聚合物的结构灵活性。软化层状结构具有调节和增强动态特性的潜力。在本工作中，通过具有不同支化结构的层间聚合物客体来调节层状聚二乙炔（PDA）的灵活性。PDA通过分子运动缩短有效共轭长度而呈现热响应变色特性。对于没有层间客体的层状PDA，在特定阈值温度下会观察到从蓝色到红色的颜色转变，而 bulky 聚合物客体的插层降低了起始温度并拓宽了热响应颜色变化的温度范围。所得的PDA与 bulky 聚合物的层状复合材料在厘米尺度的基底上提供了均匀涂层。热响应变色涂层被应用于温度分布成像。使用瓶子上的涂层通过比色法估算液体的比热容。丝绸布上的涂层在使用超声凝固切割装置的外科手术过程中可视化模拟组织上的温度分布。该涂层可应用于各种领域的热成像。此外，软化策略有助于探索软二维材料的动态特性。
