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What do you mean by plasticizer ? Give a...

What do you mean by plasticizer ? Give an example.

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The substances which give flexible polymers with improved activities, when mixed with virgin, rigid polymers are known as plasticiser. For instance, polyvinyl chloride (PVC) is a hard, rigid polymer. A plasticiser, dioctyl phthalate (DOP) is mixed with PVC to improve its commercial viability.
Example: (1) Tricresyl phosphate is used in polystyrene.
(2)Diisooctyl phthalate is used in PVC or polymethyl methacrylate.
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