Given the following data for characterization of a polymer, what is degree of po

Question

Given the following data for characterization of a polymer, what is degree of polymerization based on weight average molecular weight? A stress of 2500 psi is applied to a polymer serving as a fastener in a complex assembly. At a constant strain, the stress drops to 2400 psi after 100 h. If the stress on the part must remain above 2100 psi in order for the part to function properly, determine the life of the assembly. 527 h 427 h 325h 250h For a fixed time to rupture for polyethylene, applied stress can be_______at higher______Lower - Temperature Higher - Temperature The same - Temperature Lower -Pressure Which one of the following statements is correct? Elastomers can sustain deformations greater than 200% Thermosets are formed in three-dimensional network structures Thermoplastics can be amorphous or crystalline All of the above.

Explanation / Answer

9) A

10) D

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