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High Performance Polymers
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Processing and Properties of IM7/LARCTM -Si Polyimide Composites

T H Hou

R G Bryant

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

LARCTM-SI (NASA Langley Research Center-Soluble Imide) is an aromatic thermoplastic polyimide. LARCTM-SI is synthesized from equimolar amounts of oxydiphthalic anhydride (ODPA), 3, 3', 4, 4'-biphenyltetracarboxylic dianhydride (BPDA) and the equivalent amount of 3, 4'-oxydianiline (3, 4'-ODA). Phthalic anhydride (PA) was used as an endcapper to control molecular weight. A 30% solid LARCTM-SI solution (in NMP/Xylene: 9/1 v/v) with 3% stoichiometric imbalance was made into unidirectional long-fibre-reinforced prepregs. Thermal properties, volatile depletion behaviour and resin rheology were thoroughly characterized. Using this information, two composite moulding cycles were developed that consistently yielded well consolidated, void-free laminates. Composite mechanical properties such as short-beam shear strength, longitudinal and transverse flexural strength and flexural modulus, longitudinal tensile strength and notched and un-notched compression strengths, fracture toughness, open-hole compression strength and compression after impact (CAI) strength were measured at room temperature (RT) and elevated temperatures. LARCTM-SI composite exhibited very good toughness and damage tolerance. The interlaminar fracture toughness and the CAI strength were measured at 1.72 kJ m–2 at 35.2 GPa respectively.

High Performance Polymers, Vol. 9, No. 4, 437-448 (1997)
DOI: 10.1088/0954-0083/9/4/007
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 Journal of Thermoplastic Composite MaterialsHome page
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Journal of Thermoplastic Composite Materials, November 1, 2001; 14(6): 477 - 488.
[Abstract] [PDF]