Amine plasma modification of polyaramid filaments

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:6463555

Allred, R E; Merrill, E W; Roylance, D K

Amine plasmas offer a method to implant amine groups into the surface structure of polyaramid filaments. These amines will react with epoxy to form covalent bonds at composite interfaces. They may also be chemically modified for reaction with other polymerizing matrices. The covalently bound interface exhibits an increased resistance to peel forces. Fractured surfaces show a change in failure mode from interface dominated to a mixture of filament splitting and matrix cracking as amine content is increased. Thus, the weak link in determining off-axis strengths of polyaramid/epoxy is changed from the interface to the filament and matrix bulk strengths after amination. The covalently bonded interface should also exhibit improved hygrothermal stability. The kinetics of amination are rapid - surface saturation occurs in 30 s; however, the kinetics are sensitive to oxygen concentration. Filament tensile strength is unchanged by amine plasma treatment times less than 600 s. Spectroscopic analysis indicates that the surface structure may, nevertheless, be substantially altered.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6463555
• Report Number(s): SAND-82-2233C; CONF-830303-9; ON: DE83005197
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360301* -- Composite Materials-- Preparation & Fabrication-- (-1987)
AMINATION
ARAMIDS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COMPOSITE MATERIALS
ELECTRIC DISCHARGES
EPOXIDES
FILAMENTS
GLOW DISCHARGES
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
REINFORCED MATERIALS
SYNTHESIS
SYNTHETIC MATERIALS
TENSILE PROPERTIES