How do elastomers differ from thermoplastics?

Elastomers are known for their unique properties that make them distinct from thermoplastics, particularly in terms of flexibility. The correct answer highlights that elastomers are more flexible than thermoplastics. This flexibility is due to their molecular structure, which includes long chains that are not rigidly bonded, allowing them to stretch and return to their original shape.

In contrast, thermoplastics, while they can also be flexible, do not exhibit the same degree of elasticity as elastomers. This is because thermoplastics are composed of polymers that can be softened and reshaped when heated, but they generally do not have the same level of cross-linking that gives elastomers their superior elastic properties.

Moreover, elastomers are characterized by their ability to endure substantial deformation under stress and still recover, mimicking the behavior of rubber. This is a key attribute that sets them apart in applications requiring high flexibility and resilience, such as seals, gaskets, and tires.

Understanding the characteristic properties of both materials is crucial in selecting the right type for specific engineering applications, especially in contexts where flexibility, elasticity, and durability are paramount.