Which of the following is an example of a thermoplastic material?

Polyethylene is indeed an example of a thermoplastic material. Thermoplastics are polymers that become pliable or moldable above a specific temperature and solidify upon cooling, allowing them to be reshaped multiple times without altering their chemical structure. Polyethylene, a widely used thermoplastic, exhibits this behavior, making it suitable for various applications such as packaging, containers, and piping.

In contrast, the other options mentioned are thermosetting plastics or types of polymers that do not have the same re-moldable properties as thermoplastics. Epoxy resin and phenolic are thermosetting materials, which means they cure into a rigid structure and cannot be re-melted. Nylon can be a bit more complex as it can exhibit both thermoplastic and thermosetting characteristics depending on the specific type and formulation, but when compared to polyethylene's clear thermoplastic nature, polyethylene remains the most straightforward example in this context.