Processable Laminating Resins with Improved Moisture Resistance, Toughness and Moderate Temperature Capability. Part II.
Technical rept. 1 May-1 Aug 73,
WHITTAKER CORP SAN DIEGO CALIF RESEARCH AND DEVELOPMENT DIV
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Incorporation of 10 mole percent 4,4- dicyanatobiphenyl into the AF-R-10 resin system derived from resorcinol dicyanate resulted in an approximate 50 reduction in water pickup in humid environ-ments. Outstanding initial thermomechanical response of Modmor II graphite fiber laminates was developed wherein essentially theoretical flexural strengths and moduli were maintained throughout the temper-ature range of room temperature to 365F. Laminate response after humid aging 28 days at 120F AND 95 relative humidity showed complete retention of room temperature properties but a fall-off at 365F. Very high shear strength adhesive bonds which had good resistance to water boil resulted from the same system. Alternate dicyanate resins, notably isopropylidine-4,4-bis2,6- dimethylcyanatobenzene, show very low moisture pickup values 0.5-1.0 both in powdered resin and laminate form. Laminate properties and adhesive bonds suffered in comparison to AF-R-10 based systems, but promising results were obtained in both humid aging response laminates and water boil studies adhesive bonds. Author, modified-PL
- Laminates and Composite Materials