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Synthesis and properties of aromatic polyimides derived from 2,7‐triptycenediamine
Author(s) -
Akutsu Fumihiko,
Saito Go,
Miyamoto Masahiro,
Kasashima Yoshio,
Inoki Mari,
Naruchi Kiyoshi
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970715
Subject(s) - polyimide , thermal stability , polymer chemistry , glass transition , diamine , thermal decomposition , dimethylacetamide , solubility , pyridine , dimethylformamide , chemistry , polymerization , dimethyl sulfoxide , sulfuric acid , polymer , materials science , organic chemistry , solvent , layer (electronics)
Novel aromatic polyimides were synthesized from 9,10‐dihydro‐9,10‐ o ‐benzenoanthracene‐1,5‐diamine (2,7‐triptycenediamine) and aromatic tetracarboxylic dianhydrides. The polymerization was carried out in a two‐step procedure including ring‐opening poly‐addition giving polyamic acids, followed by thermal cyclodehydration. The polyamic acids have high inherent viscosities (0.97–1.95 dL/g in 1‐methyl‐2‐pyrrolidone). The polyimides show high glass transition temperatures (392–409°C), high decomposition temperatures at 5% weight loss (516–566°C), and high weight residues (64–69% at 800°C). All polyimides are amorphous. The polyimide from the diamine with 3,3′,4,4′‐diphenylsulfonetetracarboxylic dianhydride (4,4′‐sulfonyldiphthalic anhydride) is soluble in pyridine, N,N ‐dimethylacetamide, N,N ‐dimethylformamide, dimethyl sulfoxide and conc. sulfuric acid at 60°C, and shows high thermal stability. The introduction of 2,7‐triptycenediyl structure into the polyimide backbone has the effect of improving the solubility and maintaining the high thermal stability.