Before polymerization, nadimide end-capped polyimide oligomers exist in the endo form. During the cure, an endo-exo equilibrium takes place. This paper discusses the relationship between endo-exo isomerization and the reverse-Diels-Alder reaction of the nadinaide system. As a consequence of the experimental results, an explanation for cyclopentadiene evolution during the polymerization of nadimide systems is given.
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References
1.
[1] Burns E A, Jones R 1, Vaughan R W and Kendrick P1970NASA CR-72 633 NASA Lewis Research Center, Cleveland, OH, USA
2.
[2] Serafini T T and Delvigs P1973AppI. Polym. Symp.2289-89
3.
[3] Hay J N, Boyle J D, Parker S F and Wilson D1989Polymer301032-1032
4.
[4] (a) Wong A C and Ritchey W M1980Spectrosc. Lett.13503-503 (b) Wong A C and Ritchey W M 1981 Macromolecules 14 825-825
5.
[5] Grenier-Loustalot M F and Grenier P1991High Perform. Polymn3113,263
6.
[6] Berson J A, Reynolds R D and Jones W M1956J. Am. Chem. Soc.786049-6049
7.
[7] Craig D1951J. Am. Chem. Soc.734889-4889
8.
[8] (a) Waters J F, Sukenik C N. Kennedy V 0, Livach M, Youngs W J, Sutter .J K, Meador M A B, Burke L A and Ahn M K1992Macromolecules253868-3868 (b) Panigot M J, Waters J F. Varde U, Sutter J K and Sukenik C N 1992 Macromolecules 25 530 (c) Sukenik C N, Ritchey W M, Malhotra V and Varde U 1987 High Temperature Polymer Matrix Composites ed T T Serafini (Park Ridge, NJ: Noyes Data Corporation) p 77 (d) Sukenik C N, Malhotra V and Varde U 1985 A.C. S. Symp. Ser. (American Chemical Society) 282 53 (e) Sukenik C N, Malhotra V and Varde U 1984 Polynm Pre. (Am Chem. Soc, Div. Polym. Chem.)25104
9.
[9] Malinge J, Rabilloud G and Sillion B 1991 US. Patent A-4,987,218
10.
[10] Lauver R W1982NASA Invention Disclosure Serial Number 404,809 LEW-13,770-771
11.
[11] Gaylord N G and Martan M1981A.C. S. Symnp. Ser. (American Chemical Society)19597-97
