Application of structure-property relationships to develop seven segmented polyurethane adhesives
Seven polyurethane adhesives have been developed to meet a series of design requirements for weapons. These adhesives, designated Halthanes, were synthesized because of OSHA restrictions on the use of the curing agent methylene bis(2- chloroaniline) with the objective of meeting qualitative design requirements. Four of the Halthanes were made from LLNL-developed 4,4'-methylene bis(phenylisocyanate) terminated prepolymers cured with a blend of polyols; three were made from an LLNL-developed prepolymer terminated with Hylene W and cured with aromatic diamines. Changes in the structure of prepolymer, curing agent and accelerator were made to achieve initial viscosities in the range of 6 and 40 Pa-sec, and working times of from 4 to 24 hours. The structure of the polymer/substrate interface was used to obtain adhesive strengths of from 8 to 14 MPa at room temperature. The morphology and concentration of the hard and soft segments were used to control the modulus and elasticity of these segmented polyurethanes. Seven polyurethane adhesives have been developed that bond rapidly and well, have low to intermediate modulus over a wide temperature range, and appear to be reasonably compatible with other components.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6830756
- Report Number(s):
- UCRL-84039; CONF-810506-1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360400* -- Polymers & Plastics-- (-1987)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400300 -- Organic Chemistry-- (-1987)
ADHESIVES
CURING
MATERIALS
MECHANICAL PROPERTIES
MOLECULAR STRUCTURE
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYAMIDES
POLYMERS
POLYURETHANES
SUBSTRATES
SYNTHETIC MATERIALS
VISCOSITY