Q. Plastic that softens when heated and hardens when cooled?
Solution:
Thermoplastic – softens when heated and hardens when cooled, only changes material when heated.
These are linear polymers in which the monomers are joined in a straight line.
E.g. Polyethylene – used to make various packets, tubes and containers, and polyvinyl chloride (PVC) – used to make electrical wiring, plumbing, shoes, handbags, raincoats, bottles and furniture.
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