An organic dielectric filler polyethylene glycol-polyaniline block copolymer with low-density used in PVDF-based composites

• Published in: Composites science and technology Vol. 221; p. 109300
• Main Authors: Liu, Danian, Wang, Jingwen, Peng, Wenhai, Wang, Houqing, Ren, Hua
• Format: Journal Article
• Language: English
• Published: Barking Elsevier Ltd 12.04.2022; Elsevier BV
• Subjects: A. polymer-matrix composites (PMCs); A. Polymers; Aeronautics; Astronautics; B. Dielectricity; Barium titanates; Block copolymers; Ceramics; Charge transport; Composite materials; Copolymers; Density; Dielectric breakdown; Dielectric properties; Dielectric strength; Fillers; Permittivity; Polyanilines; Polyethylene glycol; Polymers; Semiconductor materials; Wearable technology; A. polymer-matrix composites (PMCs); A. Polymers; B. Dielectricity
• ISSN: 0266-3538; 1879-1050
• DOI: 10.1016/j.compscitech.2022.109300

In order to meet the ever-increasing demand for lightweight and flexibility with the development of aeronautics, astronautics and wearable technology, dielectric ceramics are inappropriate for the polymer-based dielectric materials due to their high density. An organic semiconductor material polyethylene glycol-polyaniline multi-alternating block (more than triblock) copolymer (with a low density ∼ 0.9 g/cm3) was designed. This polymer had a good solubility in polar solvents (e.g. DMF and DMSO) which could provide it with a good processing performance and a good dispersion in PVDF matrix. Its alternating block structure had a special role in the charge transport of PANI segments, providing composites with high dielectric constant and overcoming the poor breakdown strength problem of conductive filler-based dielectric composites, even better than BaTiO3. The breakdown strength of PEG-PANI/PVDF composite was 10.74 kV/mm and the dielectric constant was 86.64 (100 Hz) at 20 vol%, better than BaTiO3/PVDF (9.89 kV/mm and 45.23). [Display omitted] •An organic semiconductor with a low density is proposed.•The copolymer PEG-PANI has a good solubility in polar solvents.•The PEG-PANI has a good dispersion in PVDF matrix.•The PEG-PANI can significantly increase the dielectric constant of PVDF and keep a great breakdown strength.