With the development of industrialization and microelectronics, the requirements of high performance polyimides are gradually increased. How to improve the comprehensive properties of polyimides has been an attractive research direction. Pyridine, a heteroaromatic molecule with rigidity and polarizability, has good thermal stability and chemical stability. The introduction of pyridyl group to polyimide backbone might improve the comprehensive properties of polyimides. In this work, a pyridine-containing diamine monomer, 2,2’-bis[4-(5-amino-2-pyridinoxy)phenyl]sulfone (BAPDPS), was synthesized by using 2-chloro-5-nitropyridine and 4,4'-sulfonyldiphenol as raw materials via substitution reaction and reduction reaction. Then, a series of novel polyimides were successfully synthesized through copolymerization of diamine monomers BAPDPS and 4,4’-diaminodiphenylmethane (MDA) with different proportions with three dianhydrides through a two-step procedure. Figure 1 illustrates the structures of copolyimides.<br/>The results indicated that the tensile strength and tensile modulus increased with the increasing molar ratio of pyridine-containing diamine BAPDPS. Moreover, the glass transition temperature (T<sub>g</sub>) increased with the increasing molar ratio of MDA, with a high glass transition temperature up to 365 °C. The results were listed in Table 1. These copolyimides exhibited good comprehensive properties, and could become good candidates as high performance resins in aerospace industries.

Synthesis of novel polyimides containing pyridine units with good comprehensive properties via copolymerization

255th National Meeting (2018)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.