Functionalized polyimide based on mercaptoacetic acid locking imine reaction: Synthesis and coating application

Abstract

To meet the high requirements for polyimide (PI) manufacturing process without sacrificing material performance, a new type fabrication method for PI is proposed here. Based on the classical Kapton system, functionalized precursor polyamide acid (MPAA) resin solution with high solid content, low viscosity and high relative molecular weight was obtained via mercaptoacetic acid locking imine (MALI) reaction, and a series of linear Mali‐Polyimide (MPI) films were prepared and their properties were well investigated. The results showed that MPIs have relatively excellent thermal stability (Td5%: 598 ~ 601°C), good heat resistance (Tg: 277 ~ 278 °C) and high adhesion strength. This work emphasizes the possibility and potential of MALI reaction in PI synthesis and is expected to be applied in coating and adhesive field.

Imine-based multicomponent polymerization: Concepts, structural diversity and applications

“…19, Ye 2021). [142] This reaction was conducted in N-methyl-2-pyrrolidone (NMP) in the presence of molecular sieve (4 Å) to capture the produced water. The polymerization was followed by annealing at 400 °C to promote the ring closure and, ultimately, the formation of the corresponding poly(imide-thiazolidinone)s. The latter exhibited exceptional thermal stability with degradation temperature close to 600 °C.…”

“…In addition, they were casted onto a glass plate as uniform films and showed good adhesion properties with copper, aluminium and stainless-steel plates. [142] Note that the MALI reaction was also used for the modification of pre-formed polymers [143,144] or in combination with radical polymerization. [145][146][147] However, we found no example of direct MALI polymerization for the synthesis of networks or hyperbranched polymers.…”