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Summary:
As advanced composites continue to be needed as primary and secondary structures on aircraft, in recent years there has been an emphasis on damage tolerant composites that will increase the allowable strain level as well as improve low velocity impact performance. A unique approach to solving these problems has been the use of a semi-interpenetrating polymer network (SIPN) as a composite matrix. An example of a semi-interpenetrating polymer network is one that combines a thermoplastic with a thermoset. Both types of materials have their inherent advantages and disadvantages. Thermoplastics offer substantial improvements in toughness and potential processing, but have limits in upper temperature use and often have unacceptable solvent resistance. Thermosets, on the other hand, often have high use temperatures, but are inherently brittle and often are susceptible because of moisture sensitivity.
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Reproduction Note:
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1987. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
