Physiochemical Studies of PMR Resins. II: Mechanism and Kinetics of Reactions Occurring in the Temperature Range 50°C-315°C

Abstract

We have studied the amidizaton and imidization reactions in PMI prepolymers in the temperature range of 50°C-315°C by using a commercial cure cycle. The results in this temperature range, obtained with model compounds simulating the different reactions occurring in a PMR resin, indicate that there are competing side reactions leading to highly varied chemical groups, such as imide-amide and anhydride-amine, which may cause degradation of the final properties of the material as a result of the heterogeneity of the medium. A study of the rearrangement and cross-linking reactions has shown that several mechanisms may be involved, depending on whether the systems are in the molten or solid states. The results obtained can be applied to the study of commercial prepregs.

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References

[1]

T. Serafini

, High Temperature Polymer Matrix Composites, Noyes, Data Co.N.Y. (1987) and references cited.

[2]

C. Feger

M. M. Khojastech

and

J. E. McGrath

(Eds), Polyimides, Materials Chemistry and Characterization, Elsevier, Amsterdam (1989) and references cited.

[3]

P. M. Hergerother

, Polyimides,

D. Wilson

H. D. Stenzenberger

and

P. M. Hergenrother

(Eds), Blackie, Glasgow, (1990) and references cited.

[4]

P. H. Lidenmeyer

and

C. H. Sheppard

, Characterization of PMR Polyimide Resins and Prepregs, NASA Report N-84-2069S (1984) and reference cited.

[5]

M. F. Grenier-Loustalot

and

Ph. Grenier

, High Perfirm. Poym., 3, 113-113 (1991).

[6]

J. A. Berson

R. G. Reynolds

and

W. M. Jones

, y. Am. Chem. Soc., 78, 6049-6049 (1956).

[7]

A. C. Wong

and

W. M. Richey

, Macromolecules, 14, 825-825 (1981).

[8]

C. N. Sukhenik

V. Malhotra

and

U. Varde

, Am. Chem. Soc. Div. Poym. Chem., 25, 104-104 (1984).

[9]

E. A. Burns

R. J. Jones

R. W. Vaughn

and

W. P. Kendrick

, NASA Report CR-7263 (1970).

10.

[10]

P. R. Young

and

A. C. Chang

, y. Heterocyclic Chem., 20, 177-177 (1983).

11.

[11]

A. C. Wong

and

W. M. Ritchey

, Macromolecules, 14, 832-832 (1981).

12.

[12]

T. T. Serafini

and

P. Delviges

, Appl. Polym. &i., 22, 89-89 (1973).

13.

[13]

J. N. Hay

J. D. Boyle

S. F. Parker

and

D. Wilson

, Polymer, 30, 1032-1032 (1989).

14.

[14]

C. A. Pryde

, Polym. Mater. Sci. Eng., 59, 219-219 (1988).

15.

[15] M. F. Grenier-Loustalot and P. Grenier, submitted.