A polymer material, subjected to a constant strain of 0.5, undergoes stress relaxation from 3.5 MPa to 0.5 MPa in 30 seconds. What is its modulus of elasticity at 10 second?Calculate
1.Calculate the weight average molecular weight for a thermoplastic that has the following weight fractions for the molecular weight ranges listed.Hint: consult pages17and 18 of lecture file 210426.Molecular Weight Range(g/mol)Weight FractionMolecular Weight Range(g/mol)Weight Fraction0 –5,0000.0120,000 –25,0000.195,000 –10,0000.0425,000 –30,0000.2110,000 –15,0000.1630,000 –35,0000.1515,000 –20,0000.1735,000 –40,0000.072.The average molecular weight of a random poly(isobutylene-isoprene) copolymer is known to be 77,630 […]