A New Technique to Improve Adhesion of Polyaramid Fibers to Thermoplastic

A novel technique has been developed to increase interfacial adhesion be tween organic fibers and thermoplastics. The technique consists of exposing the fiber to a radio frequency plasma discharge and then immediately coating the fiber with thermo plastic while still in the vacuum environment of the...

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Bibliographic Details
Published in:Journal of thermoplastic composite materials 1991-07, Vol.4 (3), p.253-265
Main Authors: Pitt, William G., Lakenan, John E., Brent Strong, A.
Format: Article
Language:English
Subjects:
360601 - Other Materials- Preparation & Manufacture
ADHESION
ARAMIDS
DEPOSITION
INTERFACES
MATERIALS
MATERIALS SCIENCE
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASMA ARC SPRAYING
PLASMA JETS
PLASTICS
POLYMERS
ROUGHNESS
SHEAR PROPERTIES
SPRAY COATING
SURFACE COATING
SURFACE PROPERTIES
SYNTHETIC MATERIALS
TENSILE PROPERTIES
THERMOPLASTICS
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Summary:A novel technique has been developed to increase interfacial adhesion be tween organic fibers and thermoplastics. The technique consists of exposing the fiber to a radio frequency plasma discharge and then immediately coating the fiber with thermo plastic while still in the vacuum environment of the plasma reactor. Increased adhesion has been shown using a polyaramid fiber (Kevlar 49) and a polycarbonate resin (Lexan 121). An oxygen plasma exposure of 4.1 seconds at 24 Watts increased interfacial shear strength by 18 % as evaluated using the critical filament length technique. The plasma ex posure had no measurable effect on the filament tensile strength or the surface roughness. It is thought that the enhanced adhesion is due to the presence of covalent bonds formed at the interface when free radicals on the fiber are quenched by the thermoplastic.
ISSN:0892-7057
1530-7980
DOI:10.1177/089270579100400303