Journal
MACROMOLECULAR RESEARCH
Volume 12, Issue 3, Pages 263-268Publisher
SPRINGER
DOI: 10.1007/BF03218398
Keywords
polyimide precursor; poly(amic acid) salt; PMDA; ODA; FTIR spectroscopy; water-soluble; stepwise thermal imidization
Categories
Ask authors/readers for more resources
We have synthesized a water-soluble polyimide precursor, poly(amic acid) amine salt (PAD), from pyromellitic dianhydride (PMDA), 4,4'-oxydianiline, and N,N-dimethylethanolamine (DMEA) and have investigated in detail its properties with respect to the degree of salt formation (D-sf). The maximum value of D-sf we obtained upon precipitation of the precursor solution into acetone was 79%. We synthesized a PAD having a D-sf of 100% (PAD100) by the solid state drying of an organic solution. The precursors showed different solubility depending on the D-sf to make up to 4 wt% solutions in water containing a small amount of DMEA. PAD100 is completely soluble in pure water. We investigated the imidization behavior of PAD in aqueous solution using various spectroscopic methods, which revealed that PAD 100 has faster imidization kinetics relative to that of the poly(amic acid)-type precursors. The resulting polyimide films prepared from an aqueous precursor solution possess almost similar physical and thermal properties as those prepared from N-methyl-2-pyrrolidone(NMP) solution. Therefore, we have demonstrated that PAD can be used as a water-based precursor of polyimide; this procedure avoids the use of toxic organic solvents, such as NMP.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available