文档介绍：Rapid Synthesis of Polyimides from Nylon-Salt-Type
Monomers
Yoshio Imai1)
Department anic and Polymeric Materials, Tokyo Institute of Technology,
Meguroku, Tokyo 152, Japan
This paper reviews our recent findings on the rapid synthesis of polyimides from nylon-
salt-type posed of diamines and tetracarboxylic acids. Aromatic polyimides
are generally prepared by a two-step procedure from aromatic diamines and aromatic tet-
racarboxylic dianhydrides. However, the starting point of polyimide synthesis dates way
back to the mid-1950s, when aliphatic-aromatic polyimides were synthesized by the melt
polycondensation of nylon-salt-type monomers. Recently we have recovered the lost “salt
monomer method” that is very useful for the rapid synthesis of aliphatic-aromatic polyim-
ides. In addition, the salt monomer method coupled with high-pressure polycondensation
was found to be versatile for the facile preparation of aliphatic-aromatic polyimides having
well-defined structures. The properties of a series of newly synthesized aliphatic-aromatic
polyimides and the application of the salt monomer method are also included in this re-
view.
Keywords. Rapid polyimide synthesis, Nylon-salt-type monomers, Solid-state thermal poly-
condensation, High pressure polycondensation, Microwave-induced polycondensation, Ar-
omatic polyimides, Aliphatic-aromatic polyimides, Polyimide-carbon posites,
Polyimide silica hybrid materials
List of Symbols and Abbreviations . . . . . . . . . . . . . . . . . . . . . . . 2
1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Solid-State Thermal Polycondensation of Salt Monomers . . . . . 5
Preparation of Salt Monomers. . . . . . . . . . . . . . . . . . . . . . 5
Solid-State Thermal Polycondensation of Salt Monomers . . . . . . 6
3 High-Pressure Polycondensation of Salt Monomers . . . . . . . . . 11
High-Pressure Synthesis of Aliphatic Polyimides . . . . . . . . . . . 11
High-Pressur