Question

Problem 700 pts) (e) Compare the response of thermoplastics and thernosets to heati classes of polymers (if any) can be recycled. (b) what is a copolymer? The concentrations of carbon at the two faces of a 12 mm thick plate are 0.6 and 0.3 kg/m' Fe constant. If the preexponential and activation energy are 6x10 m'ls and 80,000 J/mol, Problem 8.d0 pts) The concentrations of carbon at the two faces respectively, determine the temperature at which the diffusion flux is 1.5x10 kg/m's

Answer 1

Thermoplastic

• They are formed by addition polymerisation
• They are weak, soft and less brittle
• They soften on heating and harden on cooling
• Bonds are weakly bonded
• Soluble in organic solvents
• They can be remoulded
• Example- polyethelene, PVC, ...

Thermosetting

• They are formed by condensation Polymerisation
• Strong bonds
• They are strong, hard and more brittle
• They do not soften on heating
• They cannot be remoulded
• Insoluble in organic solvents
• Example - Bakelite, urea formaldehyde, ...

Recycling

If heat is applied thermoplastic will melt and can be remoulded but thermoset are closely bonded which resist heat , so it can be used in heat resistant products such as insulation, cookware holders, car parts, etc.

Thermoplastics are 100% recyclable. In ideal situations, thermoplastics can be repeatedly melted and remoulded into new products.

Copolymer

Copolymer is a polymer plastic that is produced by combination of two or more different monomers. This process is called Co-polymerisation. This process is carried out to vary properties of polymers such as hardness, strength, rigidity, heat resistance, etc ...