Development of A High-performance Amorphous Fluorinated Polymer Electret Based on Quantum Chemical Analysis

In the present study, for the first time, a novel high-performance amorphous fluorinated polymer electret based on quantum chemical analysis is proposed. Density functional theory is adopted to analyse the electron affinity of CYTOP polymers with different end groups. In analysis of CYTOP series with different end groups, it is found that the amide bond at the end of CYTOP chain attract electron, leading to high electron affinity of the molecule. Based on the DFT results, a new electret material has been developed by adding Tris(2-aminoethyl)amine (TAA) into CYTOP CTX-A. With a 15 µm-thick film, a record-high surface charge density of -4 mC/m2 has been obtained. It is also found from the thermally stimulated discharge experiment that the electron trapped in the CTX-A/TAA have higher thermal stability than CYTOP EGG, which is known as the best fluorinated polymer electret.