treatment of reinforcements
TRANSCRIPT
TREATMENT OF REINFORCEMENTS
Presented by Sumi M Nair
COMPOSITE
A composite material can be defined as a combination of two or more materials that results in better properties than those of the individual components used alone.
REINFORCEMENT• Discontinues phase in a
composite• Strong and stiff
Physical Treatments• Plasma treatment• It is a surface modification
technique.• Improve the compatibility
between a reinforcement and matrix.
• Create a variety of desirable surface functionalities.
Chemical treatment of Reinforcements
• Chemical treatment utilizes the chemical agents to modify the reinforcements
• Improve adhesion between reinforcement and matrix
• Improves reinforcement strength• Improves moisture resistance and mechanical
properties of composites
Alkali treatment(Mercerization)• Increases surface roughness • Increases mechanical interlocking • Removes surface impurities • Decreases crystallinitySilane treatment• Improves interfacial strength• Increase thermal stablity• Increase tensile strenth.Acetylation• Reduce hygroscopic nature• Improve dimensional stability• Improves adhesion• Improves thermal stability
.
Benzoylation• Reduces hydrophilic nature of reinforcement• Improves adhesion• Improves thermal stabilityAcrylation and Acrylonitrile grafting• Decreases water absorption• Increases tensile strength and young's
modulusMaleated coupling agents• Widely used to strengthen composite• Used in Poly propylene matrix• Better wettability• Improves flexural strength and hardness• Reduced water absorption
Reaction mechanism if silane treatment
Reaction mechanism of maleated coupling agent
Permanganate treatment• Highly reactive Mn3+ions are
is responsible for initiating graft polymerization.
• Improved fiber/matrix interaction and compatibility
• Improved mechanical properties
Peroxide treatment• Free radicals react with surface
groups of the matrix.• Increase in surface roughness• created good interlocking.