Characterization of fiber reinforced phenolic composites

Miscellaneous · Wed Jan 01 00:00:00 EST 1992

OSTI ID:7077006

Narayan, S

Phenolic resins of the straight and modified type were reinforced with short fibers that are potential substitutes for asbestos used in friction materials, to yield composite materials. These composites were tested for several mechanical properties and the Young's modulus was predicted based on the Halpin-Tsai model for random short fiber composites. The study was extended to friction materials containing glass fibers of varying length and diameter. Fiber sizing, length, and diameter were found to play a significant role in affecting the mechanical properties. The role of chemical species such as water, salt water, isooctane, ethylene glycol, and other liquids on phenolic resins and its composites were investigated. The sorption and diffusion of these small molecules in these materials were studied using Fick's laws. The maximum solvent uptake and the diffusion coefficient of the solvent in these systems were determined and the experimental data fitted to a model. After exposure to these contaminants, the mechanical properties of all the systems were determined and a general degradation in properties was found. The dynamics of water in the resin and composite was investigated using deuterium NMR. The relaxation times of the mobile components of the spectra was calculated for the resin and the composite as a function of temperature. In order to characterize the fiber-matrix interface, the interfacial shear strength of Kevlar reinforced phenolics was determined using the single strand pull out technique.

• Research Organization: Missouri Univ., Rolla, MO (United States)
• OSTI ID: 7077006
• Resource Relation: Other Information: Ph.D. Thesis
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
MECHANICAL PROPERTIES
REINFORCED MATERIALS
REINFORCED PLASTICS
SOLVENTS
SORPTION
ASBESTOS
DIFFUSION
ETHYLENE
FIBERS
FRICTION
GLASS
LIQUIDS
MOLECULES
NUCLEAR MAGNETIC RESONANCE
RESINS
WATER
ALKENES
FLUIDS
HYDROCARBONS
HYDROGEN COMPOUNDS
MAGNETIC RESONANCE
MATERIALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
RESONANCE
SYNTHETIC MATERIALS
360603* - Materials- Properties