Example of thermoplastic among the following is

Question

Accepted Answer

Polythene, also known as polyethylene, is a prime example of a thermoplastic. Thermoplastics are materials that become pliable or moldable above a specific temperature and solidify upon cooling. This property allows them to be reshaped and recycled multiple times without undergoing any significant chemical change. Polythene is widely used in various applications, such as packaging films, containers, and plastic bags, due to its flexibility, durability, and ease of processing.

Now, let's examine why the other options are incorrect:

1. **Bakelite**: Bakelite is a thermosetting plastic, not a thermoplastic. Thermosetting plastics, once set, cannot be remelted or reshaped. Bakelite is known for its high resistance to heat and electricity, making it suitable for electrical insulators and kitchenware handles.

2. **Melamine**: Like Bakelite, melamine is a thermosetting plastic. It is used in the production of laminates, dinnerware, and flame-retardant fabrics. Once cured, melamine cannot be remolded, which is a key characteristic of thermosetting plastics.

3. **Urea-formaldehyde resin**: This is another example of a thermosetting plastic. Urea-formaldehyde resins are used in adhesives, finishes, and molded objects. They are known for their high strength and resistance to heat, but they cannot be reshaped once set.

In summary, polythene is the correct answer as it is a thermoplastic, capable of being reshaped and recycled, unlike the other options, which are thermosetting plastics and cannot be remolded once cured.