Which of the following would you expect to be elastomers


Which of the following would you expect to be elastomers and which thermosetting polymers at room temperature? Justify each choice.

(a) Epoxy having a network structure

(b) Lightly crosslinked poly(styrene-butadiene) random copolymer that has a glass-transition temperature of -50(C

(c) Lightly branched and semicrystalline polytetrafluoroethylene that has a glass-transition temperature of -100(C

(d) Heavily crosslinked poly(ethylene-propylene) random copolymer that has a glass-transition temperature of 0(C

(e) Thermoplastic elastomer that has a glass-transition temperature of 75(C

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Chemical Engineering: Which of the following would you expect to be elastomers
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