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Abstract:
Several modifications of the previously studied HR 600 adhesive were chosen for investigation as addition cured polyimide adhesives for titanium. All of the materials studied were acetylene terminated oligomers which were prepared by reacting an arylenediamine with benzophenonetetracarboxylic dianhydride (BTDA) and capping this product with either 3-aminophenylacetylene (I) or 3-(3-aminophenoxy)phenylacetylene (II), followed by imidizing in a refluxing benzene-cresol mixture or in acetic anhydride. The most promising oligomers from the standpoint of melting point, solubility, flow properties and adhesive strength were those from I, BTDA, and 1,3-di-(aminophenoxy)benzene(III), designated HR 600 DP-2 (HR 600 oligomer), and from II, BTDA, and III, designated HR 650. The present manufacturing cost (labor + materials) of HR 600 oligomer is considerably less than that of HR 650. Measured ambient temperature titanium lap shear strengths have been in excess of 4200 psi for HR 650 and 3600 psi for HR 600 oligomer, and lap shear strengths as high as 2600 psi at 500 F have been measured for both materials. Elevated temperature air aging tests (90 percent RH at 160 F) are very encouraging. Weld-bond fatigue data, Pi-tension titanium honeycomb data and T-peel data are presented and discussed. (Author)
| Description: |
Technical rept. 1 Mar 74-31 Mar 75 |
| Pages: |
80 |
| Report Date: |
AUG 1975 |
| Contract Number: |
F3361573C5062 |
| Report Number: |
B909700 |
Report Unavailable |
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