Identify thermoplastic polymer from following.

Thermoplastic polymers exhibit reversible softening upon heating and hardening upon cooling, typically possessing linear or branched structures.

Polyvinyl chloride (PVC) and polyethylene terephthalate (PET, Terylene) demonstrate thermoplastic behavior, capable of repeated melting and reshaping.
Bakelite is a phenol-formaldehyde thermoset polymer with an irreversible, cross-linked structure.
Neoprene, though an elastomer, is often cross-linked in its final form, rendering it non-thermoplastic.

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