Charged Synthetic Polystyrene Heterostructures for Charge Trapping and Piezoelectric Response

piezoelectric polymers;charge storage;Materials Science & Engineering

Chi, ChenMueller, Tim ;

Johns Hopkins University

关键词: piezoelectric polymers;    charge storage;    Materials Science & Engineering;   

Others  :  https://jscholarship.library.jhu.edu/bitstream/handle/1774.2/60170/CHI-THESIS-2018.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: JOHNS HOPKINS DSpace Repository

【 摘 要 】

Piezoelectric polymeric material is a comparatively new field of research but may have potential in numerous applications. In this project, we describe a chemical design and synthesis method for a set of polystyrene-based polymers including two crosslinked polymers using free radical polymerization and side-chain functionalization. The synthesized polymers were drop cast on copper plates to fabricate devices with thick films and charged by Corona charging. Surface voltages were tested to illustrate the charge storage capabilities, and d33 coefficients of different films were measured as a manifestation of their piezoelectric responses. We observed that the charge storage capability depended on both the glass transition temperature (Tg) and the functional side groups of the polymer while the piezoelectric response depended on charge storage capability as well as the flexibility of the polymers. One of the synthesized polymers showed a remarkably high d33 coefficient of 168 pC/N. Even some of the lower d33 obtained for some polymers of around 70 pC/N are in the upper range for this polymer class.