Linear polymers typically exhibit which classification in terms of thermal behaviour and processing?

Introduction / Context:
The architecture of polymer chains—linear, branched, or crosslinked—governs thermal response and processing. Recognising the link between structure and behaviour helps select moulding, extrusion, or curing pathways.

Given Data / Assumptions:

• Linear polymers possess chains without extensive crosslinking.
• We seek the general classification that matches most linear materials.

Concept / Approach:
Linear (and lightly branched) polymers soften and flow upon heating due to increased chain mobility, enabling melt processing; they are categorised as thermoplastics. Thermosets, by contrast, contain dense covalent crosslinks that do not melt on heating but instead char or degrade. Elastomers are lightly crosslinked to exhibit rubbery elasticity at service temperature; however, not all linear polymers are elastomeric.

Step-by-Step Solution:
Map structure → behaviour: linear chains → melt reprocessability.Select “thermoplastic” as the most representative class.Exclude thermoset and elastomer categories which require crosslinking for their defining properties.

Verification / Alternative check:
Commodity resins such as PE, PP, PS, and PET are largely linear/branched and are melt-processable thermoplastics.

Why Other Options Are Wrong:
Thermosetting: needs crosslinked network, not typical of linear chains.Elastomeric: requires light crosslinking and glass transition below service temperature—structure/function differs.“Extremely high softening point only”: not a classification and not universally true.

Common Pitfalls:
Assuming “linear” implies “rubbery.” Rubberiness depends on Tg and crosslink density, not linearity alone.

Final Answer:
Thermoplastic