When a plasticizer is added to a polymer, the overall effect is to ________ the crystallinity of the polymer and ________ its Tg.

Question

Quizplus · Accepted Answer

When a plasticizer is added to a polymer, it increases the space between polymer chains, which leads to a reduction in the crystallinity of the polymer. This is because the plasticizer molecules disrupt the regular arrangement of polymer chains, making it difficult for them to pack tightly and form crystals.

Moreover, the addition of a plasticizer lowers the glass transition temperature (Tg) of the polymer. This is because the plasticizer molecules mix with the polymer chains and increase their mobility, making it easier for them to slide past each other. As a result, the polymer becomes softer and more flexible at lower temperatures.

When a Plasticizer Is Added to a Polymer, the Overall