Structure and Properties of Low Dielectric Constant Polyetherimide Films Containing-CF3 and Cardo Groups

• Published in: Macromolecular research Vol. 30; no. 11; pp. 826 - 835
• Main Authors: Peng, Jun, Wang, Qian, Wang, Jin, Yang, Jun, Jiang, Taijun, Zeng, Guangsheng
• Format: Journal Article
• Language: English
• Published: Seoul The Polymer Society of Korea 01.11.2022; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Charge distribution; Charge transfer; Chemistry; Chemistry and Materials Science; Complex Fluids and Microfluidics; Diamines; Dipole moments; Energy distribution; Glass transition temperature; Mechanical properties; Nanochemistry; Nanotechnology; Optimization; Permittivity; Physical Chemistry; Polyetherimides; Polymer Sciences; Polymers; Potential energy; Soft and Granular Matter; Stiffness; micro-structure; cardo group; polyetherimide; dielectric constant
• ISSN: 1598-5032; 2092-7673
• DOI: 10.1007/s13233-022-0089-6

Cardo containing phenoxy and -CF 3 derivate diamine was synthesized, and further it was polymerized with 3,3′,4,4′-biphenyl tetracarboxylic dianhydride to prepare polyetherimide containing Cardo group. The transmittance of the prepared polymer increased from 82% to 88% and the dielectric constant decreased from 2.91 to 2.83 with a slight decline in thermal and mechanical performance when -CF 3 was introduced. The molecular simulation in terms of charge distribution, electric potential energy, chain stiffness and aggregation state revealed that -CF 3 could restrain charge transfer and decrease the unit dipole moment and polarization for its larger volume. The optical and dielectric performance was significantly enhanced, but the thermal and mechanical performance decreased slightly when the -CF 3 group was introduced. The glass transition temperature of the polymer declined from 329 °C to 311 °C. The investigation conducted in this paper can offer valuable reference to the optimization and development of synthesis and comprehensive performance of polyimide.