Accession Number:

AD0921155

Title:

Processable Laminating Resins with Improved Moisture Resistance, Toughness and Moderate Temperature Capability. Part II.

Descriptive Note:

Technical rept. 1 May-1 Aug 73,

Corporate Author:

WHITTAKER CORP SAN DIEGO CALIF RESEARCH AND DEVELOPMENT DIV

Report Date:

1974-04-01

Pagination or Media Count:

36.0

Abstract:

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

Subject Categories:

  • Laminates and Composite Materials
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE