Synthesis and Characterization of Modified Phenylethynyl Imides

Abstract

As an ongoing effort to develop structural adhesives for high-performance aerospace applications, recent work has focused on phenylethynyl terminated imide (PETI) oligomers. The work reported herein involves the synthesis and characterization of a series of phenylethynyl containing oligomers designated LARC™ MPEI (modified phenylethynyl imide). These oligomers presumably contain mixtures of linear, branched and star-shaped molecules. The fully imidized polymers exhibited minimum melt viscosities as low as 600 poise at 335 °C, significantly lower than equivalent molecular weight linear materials. Ti/Ti lap shear specimens processed at 288 °C under 15 psi showed tensile shear strengths as high as ∼6000 psi and ∼5200 psi at ambient temperature and 177 °C respectively. The chemistry and properties of these new MPEIs are presented and compared with an optimized linear PETI, LARC™ PETI-5.

Get full access to this article

View all access options for this article.

References

[1] Hergenrother P M 1985 Encyclopedia of Polymer Science and Engineering vol 1 2nd edn (New York: Wiley) p 61-61

[2] Harris F W , Pamidimukala A , Gupta R , Das S , Wu T and Mock G 1984 J. Macromol. Sci.-Chem. A 21 1117-1117

[3] Bryant R G , Jensen B J and Hergenrother P M 1992 Polym. Prepr. 33 910-910

[4] Bryant R G , Jensen B J and Hergenrother P M 1993 Polym. Prepr. 34 566-566

[5] Jayaraman S , Meyer G , Moy T , Srinivasan R and McGrath J E 1993 Polym. Prepr. 34 513-513

[6] Paul C W , Schultz R A and Fenelli S P 1993 Advances in Polyimide Science and Technology: Proc. Fourth Int. Conf. on Polyimides ed C Feger , M M Khoyasteh , and M S Htoo (Lancaster, PA: Technomic) pp 220–224

[7] Jensen B J , Bryant R G and Wilkinson S P 1994 Polym. Prepr. 35 539-539

[8] Smith J G and Hergenrother P M 1994 Polym. Prepr. 35 353-353

[9] Havens S J , Bryant R G , Jensen B J and Hergenrother P M 1994 Polym. Prepr. 35 553-553

10.

[10] Jensen B J , Bryant R G , Smith J G and Hergenrother P M 1995 J. Adhesion 54 57-57

11.

[11] Hou T H , Jensen B J and Hergenrother P M 1996 J. Comp. Mater. 30 109-109

12.

[12] Jensen B J 1996 Polym. Prepr. 37 222-222

13.

[13] Cano R J and Jensen B J 1997 J. Adhesion 60 113-113