The rate of change in a polymer\'s conformation depends on several factors, incl

Question

The rate of change in a polymer's conformation depends on several factors, including temperature, the nature of bonds and functional groups in a polymer, and other structural features such as whether the polymer is crystalline, glassy, or rubbery.

Consider the following polymers:

polystyrene (PS), which does not crystallize and has a glass transition temperature of 100 C.

poly(ethylene terephthalate) (PET), which crystallizes at 267 C.

poly(dimethyl siloxane) (PDMS), which does not crystallize and has a glass transition temperature of -125 C.

Rank PS, PET, and PDMS from highest to lowest in terms of the rate of conformational change at room temperature.

A. PS > PET > PDMS B. PS > PDMS > PET C. PET > PDMS > PS D. PET > PS > PDMS E. PDMS > PET > PS F. PDMS > PS > PET

Explanation / Answer

Solution: F. PDMS > PS > PET

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