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High Performance Polymers
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LaRC TM-SI: A Soluble Aromatic Polyimide

Robert G Bryant

NASA Langley Research Center, MS 226, Hampton, VA 23681-0001, USA

LaRCTM-SI (NASA Langley Research Center-Soluble poly Imide) is a wholly aromatic, high-performance thermoplastic with a unique combination of physical, mechanical and adhesive properties. LaRCTM-SI is synthesized from equimolar amounts of the dianhydrides 4, 4'-oxydiphthalic anhydride (ODPA) and 3, 3', 4, 4'-biphenyltetracarboxylic dianhydride (BPDA); 3, 4'-oxydianiline (3, 4'-ODA) and phthalic anhydride (PA) as an endcapping reagent. The most unique property of LaRCTM-SI is its initial solubility in conventional high-boiling aprotic solvents. However, when exposed to temperatures above its softening point of 250 °C it becomes insoluble yet retains its melt processability. This allows LaRCTM-SI to be solution processed as both a polyamic acid and a polyimide. In addition to this solubility characteristic and high softening point, LaRCTM-SI is extremely tough and fracture resistant with G1c and K1c values of 4.6 kJ m–2 and 4.4 MN m–3/2 respectively. As a melt extruded film, LaRCTM-SI has been used as a hot melt adhesive to bond titanium and aluminium with lap shear strengths for titanium and cleavage strengths for aluminium exceeding 43 MPa and 16.9 MPa respectively at 23 °C.

High Performance Polymers, Vol. 8, No. 4, 607-615 (1996)
DOI: 10.1088/0954-0083/8/4/009
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