Preparation of poly (bis(trialkylammonium) 4,4′-oxydiphenylenepyromellitamate) films: A useful polyimide precursor film

Journal of Polymer Science, Part A: Polymer Chemistry

Volumn 35, Issue 12, 1997, Pages 2493-2499

  Echigo, Yoshiaki ^a   Miki, Norihiko ^a   Tomioka, Isao ^a  

^a UNITIKA LTD   (Japan)

Author keywords

Coefficient of thermal expansion (CTE); Poly(amic acid) salt films; Polyimide

Indexed keywords

AROMATIC POLYMERS; COMPOSITION EFFECTS; CURING; METHANOL; PLASTICS CASTING; POLYIMIDES; POLYMERIZATION; SPECTROSCOPIC ANALYSIS; THERMAL EXPANSION;

POLYAMIC ACID; TRIALKYLAMINES;

PLASTIC FILMS;

EID: 0031224170     PISSN: 0887624X     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1099-0518(19970915)35:12<2493::AID-POLA20>3.0.CO;2-1     Document Type: Article

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11. 4/THF at 35°C. Molecular weight calculations were based on polystyrene standards.
12. Sample PI films for the CTE measurements were prepared by thermal imidization without removing the poly(amic acid) films from the glass slide.
13. -1, which correspond to antisymmetrical stretching of the ethyl group and carboxylate anion, respectively, were clearly observed.
14. -1 which corresponds to C=O symmetrical stretching of PI, is clearly observed.
15. This suggests that the trans amidized poly(amic acid) salt takes more preferable conformation for the thermal imidization in comparison with the cis isomer.
16. Chemical structure was confirmed by FTIR spectra. However, in this study we could not determine how completely were the amines removed from the films upon curing.