_____is a plastic polymer made of
chemical units called polymides
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A polyamide is a polymer with repeating units linked by amide bonds. Polyamides occur both naturally and artificially. Examples of naturally occurring polyamides are proteins, such as wool and silk.
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Polyester (Poly+ester) is a category of polymers, made up of the repeating units of a type of chemicals called ester. Polyester fibres are strong, resistant to stretching and shrinking.
Polyester
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