Which of the following is most likely to creep at room temperature (20 °C) ? a)

Question

Which of the following is most likely to creep at room temperature (20 °C) ?

a) Polypropylene (PP atactic): Tg = - 20 °C

b) Polystyrene (PS) : Tg= 95 °C

c) Silicon carbide ( engineering ceramic, SiC, Tm = 2830 °C)

d) Iron (metal, Tm= 1538 °C )

Tg = glass transition temperature of a polymer

(2) 4) a) Polypropylene (PP atactic): Tg -20 °C b) Polystyrene (PS): Tg 95 °C c) Silicon carbide (engineering ceramic, SiC, Tm 2830 °C) d) Iron (metal, Tm 1538 oc) Tg glass transition temperature of a polymer Which of the following is most likely to creep at room temperature (20 °C)?

Explanation / Answer

Answer : polypropylene

Glass transition temperature is the temperature range where a thermosetting polymer changes from a hard, rigid, glassy state to a more pliable, compliant and rubbery state. At this temperature change the mobility of the polymer chains increases. Polypropylene is having the lowest glass transition temperature in the given list. Thus it is most likely to creep at room temperature. Silicon carbide and iron are materials which is having high melting temperatures (Tm). Thus there is no chance to creep theses materials at room temperature.

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