All-Polymer Piezoelectric Elastomer with High Stretchability, Low Hysteresis, Self-Adhesion, and UV-Blocking as Flexible Sensor

作者：Shi, Yongdong; Tian, Yu; Guan, Youjun; Kang, Xinchang; Li, Yuanxing; Ren, Kunyu; Wen, Chaoyao; Ning, Chengyun; Zhou, Lei^*; Fu, Rumin^*; Tan, Guoxin^*

来源：ACS applied materials & interfaces, 2023, 15(36): 43003-43015.

DOI：10.1021/acsami.3c09065

• elastomer
• piezoelectric
• self-adhesion
• UV-blocking
• flexible sensor

All-polymer piezoelectric elastomers that integrate self-powered, soft, and elastic performance are attractive in the fields of flexible wearable electronics and human-machine interfaces. However, a lack of adhesion and UV-blocking performances greatly hinders the potential applications of elastomers in these emerging fields. Here, a high-performance piezoelectric elastomer with piezoelectricity, me-chanical robustness, self-adhesion, and UV-resistance was developed by using poly(vinylidene fluoride) (PVDF), acrylonitrile (AN), acrylamide (AAm), and oxidized tannic acid (OTA) (named PPO). In this design, the dipole-dipole interactions between the PVDF and PAN chains promoted the content of beta-PVDF, endowing high piezoelectric coefficient (d(33), 58 pC/N). Besides, high stretchability (similar to 500%), supercompressibility (similar to 98%), low Young's modulus (similar to 0.02 MPa), and remarkable elasticity (similar to 13.8% hysteresis ratio) were achieved simultaneously for the elastomers. Inspired by the mussel adhesion chemistry, the OTA containing abundant catechol and quinone groups provided high adhesion (93.26 kPa to wood) and an exceptional UV-blocking property (similar to 99.9%). In addition, the elastomers can produce a reliable electric signal output (V-ocmax = 237 mV) and show a fast response (24 ms) when subjected to external force. Furthermore, the elastomer can be easily assembled as a wearable sensor for human physiological (body pulse and speech identification) monitoring and communication.

• 单位
  广东工业大学; 广州医学院