Larc-13 polyimide adhesive bonding

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Larc-13 polyimide adhesive bonding

Clair, T.L.S. / Progar, D.J.

A novel addition-polyimide adhesive, LARC-13, has been developed which shows promise for bonding titanium to titanium and composite to composite for applications which require service temperatures in excess of 533 K(500 F). LARC-13 is based on an oligomeric bis-nadimide containing a meta-linked aromatic diamine. Due to its oligmeric nature the adfhesive melts prior to polymerization, thereby allowing it to be processed at 344 kPa (50 psi) or less. Therefore, LARC-13 is ideal for the bonding of fragile honeycomb sandwich structures. After melting ,the resin thermosets during the cure of the nadic endcaps to a highly crosslinked system. Because of the cure mechanism associated with this adhesive, few volatiles are evolved, thus allowing large enclosed structures to be bonded. This adhesive has successfully been used to bond the outer skin and inner skin of a polyimide/graphite wing shear panel for use at 533 K (500 F). It has also been used for an application which requires short-term exposure up to 867 K (1100 F). Preparation of the adhesive as well as bonding, aging and testing of lap shear and Honeycomb samples are discussed. (Kursetz)