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Explain the term elastic memory with reference to thermoplastics. - Leaving Cert Engineering - Question i - 2018
Question i
Explain the term elastic memory with reference to thermoplastics.
Worked Solution & Example Answer:Explain the term elastic memory with reference to thermoplastics. - Leaving Cert Engineering - Question i - 2018
Step 1
Explain the term elastic memory
Answer
Elastic memory is a property observed in certain materials, specifically thermoplastics, which enables them to return to their original shape and state after being deformed. This characteristic arises due to the molecular structure of the polymer chains within the thermoplastic.
When a thermoplastic is subjected to mechanical stress, such as bending or stretching, its polymer chains are temporarily rearranged. However, when the material is heated, these chains become more mobile, allowing the thermoplastic to revert to its initial configuration. This phenomenon is particularly useful in applications where shape retention is crucial, as it ensures that the material can recover its form after use.
Step 2
Reference to thermoplastics
Answer
In the context of thermoplastics, elastic memory plays a vital role. For instance, if a piece of thermoplastic is molded into a specific shape or bent, upon heating it, the material can be restored to its original shape. This attribute allows for flexibility in manufacturing and recycling processes, as thermoplastics can be reshaped multiple times without permanent deformation, enhancing their utility in various applications.