Discussion
Plasticisers are added to polyvinyl chloride in order to
Answer: C
Correct answer: lower its glass transition point
A plasticiser is a small molecule that inserts itself between the polymer chains, increasing their separation and letting them move past one another more readily. That lowers the glass transition temperature from about 80 degrees for rigid PVC to well below room temperature, turning a rigid pipe material into flexible sheet, cable insulation and upholstery - the same polymer in two quite different guises.
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