Recycling of Composites

What is a composite material?

• A composite material is a material made from a single constituent material with uniform properties.
• A composite material is a material made from two or more constituent materials with identical physical or chemical properties.
• A composite material is a material made from two or more constituent materials with significantly different physical or chemical properties.

What are the components used in the fabrication of composites?

• Glass and ceramics
• Matrix and Reinforcements

• Metal and plastic

What is the matrix in a composite part?

• The color of the part
• The temperature at which the part was manufactured
• Material that holds the fibers together

What do fibers provide in a composite?

• Strength and stiffness

• Flexibility and durability
• Color and texture

What are the two most used forms of polymeric composites?

• Polyester-reinforced composites

• Fiber-reinforced thermoplastics and fiber-reinforced thermosets

• Ceramic-reinforced composites

What is the difference between a these two classes?

• Thermoplastics can be melted and reshaped multiple times, while thermosets cannot be remelted.
• Thermoplastics are only used in high-temperature applications, while thermosets are used in low-temperature applications
• Thermoplastics are more environmentally friendly than thermosets

What makes thermosets hard to recycle?

• Weak cross-links formed during curing
• Easily biodegradable
• Strong cross-links formed during curing

What are the available composite recycling methods?

• Thermal recycling
• Mechanical recycling, chemical recycling, and energy recovery
• Biological recycling