Accession Number:

AD0276048

Title:

RESEARCH AND DEVELOPMENT OF HIGH TEMPERATURE STRUCTURAL ADHESIVES

Descriptive Note:

Corporate Author:

WHITTAKER CORP SAN DIEGO CALIF NARMCO RESEARCH AND DEVELOPMENT DIV

Personal Author(s):

• RUETMAN,SVEN H.
• LEVINE,HAROLD H.

Report Date:

1962-05-15

Pagination or Media Count:

44.0

Abstract:

Elemental analyses of a phenolic resin after pyrolysis in an inert atmosphere gave additional support to the postulated formation of condensed ring systems. In situ syntheses of semi-inorganic polymers through pyrolysis of siliconephenolic laminates in the presence of H2S at 1500 F resulted in specimens with improved oxidation resistance. Constructive pyrolysis of phenolic laminates at 1800 F showed very large decreases in volume resistivity. Arsenic thioarsenate cure of epoxy-novolac adhesive at lower cure temperature eliminated smoking, but the resulting bonds had poorer tensile shear strengths. Antimony thioarsenate was inferior to arsenic thioarsenate as a curing agent for epoxy-novolac adhesive. Oxidative pyrolysis of bis2-hydroxyphenylmethane at 290 to 295 C resulted in dehydration of the hydroxy groups and in cleavage of the methylene bridges. Oxidation of bis2-hydroxyphenyl-sulfide at 260 C yielded some spectroscopic evidences for formation of sulfoxide and sulfone moieties. Pyrolysis of diphenyldifluoromethane at 220 to 230 C in the presence of air resulted mostly in benzophenone formation. Author

Descriptors:

• *ADHESIVES
• *HEAT RESISTANT PLASTICS
• *LAMINATES
• *PHENOLIC PLASTICS
• *SILICONE PLASTICS
• BINDERS
• BONDING
• BORON COMPOUNDS
• EPOXY RESINS
• FORMALDEHYDE
• HIGH TEMPERATURE
• MECHANICAL PROPERTIES
• OXIDATION
• PHENOLS
• PLASTICS
• PYROLYSIS
• ELECTRICAL RESISTANCE
• SILANES
• STABILITY
• SULFIDES
• SYNTHESIS
• TEMPERATURE
• TENSILE PROPERTIES

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE