Elastic and viscoelastic properties of advanced thermoplastics and their short-fiber composites

Thesis/Dissertation · Tue Dec 31 23:00:00 EST 1985

OSTI ID:5253228

Ogale, A A

The influence of microstructural features on the elastic and viscoelastic properties of Polyetheretherketone (PEEK) and short carbon fiber reinforced PEEK was investigated. A composites approach was employed to first model the properties of the semicrystalline polymer as a composite material and later to model the properties of the short-fiber composite. The Aggregate Model was used in conjunction with experimental moduli for the amorphous and semicrystalline polymer to extract an estimate for the crystalline modulus. The crystalline modulus was subsequently used to predict the creep response at intermediate levels of crystallinity. Creep and dynamic mechanical responses at elevated temperatures were interrelated by the use of temperature-time-frequency superposition principle to obtain the long-term prediction for the creep response. The viscoelastic response was found to be affected by the physical aging phenomenon. The effect of aging on elastic and viscoelastic properties was observed at all attainable levels of crystallinity. Calorimetric studies have been conducted to assess the influences of aging on the enthalpy relaxation of amorphous and semicrystalline PEEK. Short carbon-fiber-reinforced PEEK was characterized for the elastic and viscoelastic response.

• Research Organization: Delaware Univ., Newark (USA)
• OSTI ID: 5253228
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
AGING
COMPOSITE MATERIALS
CREEP
CRYSTAL STRUCTURE
ELASTICITY
FIBERS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
SYNTHETIC MATERIALS
TENSILE PROPERTIES
THERMOPLASTICS
VISCOSITY