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<title>Moisture absorption and mechanical properties for high-modulus Pitch 75 graphite-fiber-modified cyanate ester resin laminates</title>

1992; SPIE; Volume: 1690; Linguagem: Inglês

10.1117/12.138005

1996-756X

Christopher Blair, Jerry Zakrzewski,

Silicone and Siloxane Chemistry

Structural epoxy resins used in the fabrication of composite structures for spacecraft applications absorb significant amounts of water. This moisture absorption results in swelling of the structures during fabrication and assembly and subsequent desorption shrinkage in space. Reduction of this effect will be required for development of dimensionally stable large advanced space structures. In the last several years modified epoxy resins, cyanate esters and cyanate esters/epoxy resins have been developed with lower moisture absorption structures to address this issue. Work has continued for several years on the evaluation of high modulus Pitch 75 laminates made using modified low moisture absorption epoxy and cyanate systems to developed structural and thermophysical data for use in the design of stable structures. This paper describes the evaluation of moisture absorption and mechanical properties of unidirectional and quasi-isotropic Pitch 75 laminates made from selected cyanate esters and cyanate ester-epoxy resins.