Question

Explain the difference between thermoplastic and thermosetting plastics.

Answer 1

Polymers are repeating chains of units of monomers. Polymers are broadly classified into three types based on their chemical composition, nature and properties when temperature is applied.

Explanation:

Polymers are repeating chains of units of monomers. They are long chains of similar molecules linked in different ways giving the name Linear polymers, Branched polymers and Cross-linked polymers.

Polymers are broadly classified into three types based on their chemical composition, nature and properties when temperature is applied, namely:

1. Thermoplastic polymers

2. Thermosetting polymers

3. Elastomers  

Thermoplastic polymers / plastics

Thermoplastic are  monomers are linked end to end to each other as long chains in linear fashion, they are called liner polymers. It is made of polymer resins. They have the ability of changing their shape when temperature is applied and take up any new shape. They are highly recyclable. Thermoplastics are an  example of linear polymers.

Examples of thermoplastics are polyester, polypropylene, nylon, teflon, etc.

Thermosetting polymers / plastics

The polymer chains are inter-linked to each other by covalent bonds, hence the name cross-linked polymers. They are made from hard substances. Once they are molded into a form under heat, it stays a true structure. They are unstable under heat and loose the molded shape. They cannot undergo repeated cycles of temperature hence cannot be recycled. Thermosetting polymers and Elastomers are examples of cross linked polymers.

Examples of thermosetting plastics are: silicone, epoxy, phenolic, polyurethane, etc.

Answer 2

Thermoplastic polymers

• Thermoplastic polymers and plastics are thermoplastic polymers or plastics that are made from a thermoplastic polymer.
• Liner polymers are thermoplastics that are made up of monomers that are joined end to end in long chains in a linear pattern.
• Polymer resins make it up. They may change their form and take on any new shape when exposed to heat.
• They may be recycled in large quantities. Linear polymers include things like thermoplastics.
• Polyester, polypropylene, nylon, teflon, and other thermoplastics come to mind.

Thermosetting polymers / plastics  

• Cross-linked polymers are made up of polymer chains that are interconnected by covalent bonds. They are constructed of tough materials.
• They remain true structures after being shaped into a form under heat. They lose their sculpted form when heated and become unstable.
• They can't be recycled since they can't withstand repeated temperature changes.
• Cross linked polymers include thermosetting polymers and elastomers, for example.
• Silicone, epoxy, phenolic, polyurethane, and other thermosetting polymers come to mind.