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

Personal Author(s) : Delano,Chadwick B. ; Harrison ,Edward S.

Report Date : APR 1974

Pagination or Media Count : 36

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 365^F. Laminate response after humid aging (28 days at 120^F AND 95+% relative humidity) showed complete retention of room temperature properties but a fall-off at 365^F. 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'-bis(2,6- 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)

Descriptors :   (*Epoxy resins, Laminates), (*Composite materials, Aging(Materials)), (*Laminates, Cyanates), Heat resistant plastics, Moistureproofing, Toughness, Thermoplastic resins, Carbon fibers, Graphite, Humidity, Adhesive bonding, Shear strength, Synthesis(Chemistry), Curing, Adhesives, Processing

Subject Categories : Laminates and Composite Materials
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE