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4. Material A is a thermoset polymer. Material B is an amorphous thermoplastic polymer with T = -25C and T = 175C. At room

4. Material A is a thermoset polymer. Material B is an amorphous thermoplastic polymer with T = -25C and T = 175C. At room temperature, which of the two materials is likely to be: a) more brittle? b) harder? Justify your answers by discussing the microstructure of the materials in both cases.

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