Characterization of fiber reinforced phenolic composites
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
- Country of Publication:
- United States
- Language:
- English
Similar Records
Tribological study of non-asbestos fiber reinforced phenolic composites for braking applications
Predicting the tensile and compressive modulus of electrospun fiber mat‐reinforced hydrogels using the Halpin–Tsai equations
Related Subjects
360603* -- Materials-- Properties
ALKENES
ASBESTOS
COMPOSITE MATERIALS
DIFFUSION
ETHYLENE
FIBERS
FLUIDS
FRICTION
GLASS
HYDROCARBONS
HYDROGEN COMPOUNDS
LIQUIDS
MAGNETIC RESONANCE
MATERIALS
MECHANICAL PROPERTIES
MOLECULES
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
REINFORCED MATERIALS
REINFORCED PLASTICS
RESINS
RESONANCE
SOLVENTS
SORPTION
SYNTHETIC MATERIALS
WATER