Five pieces of plastic, each one made of a different polymer, feature the same n
ID: 523756 • Letter: F
Question
Five pieces of plastic, each one made of a different polymer, feature the same number-average molecular weights. Which one will feature, on average, the longest molecules (a) PTFE (b) PE (c) PVC (d) PP (e) They are equal weights A PVC-PE copolymer molecule (comprised of 75% PVC numerically) features a weight of 68,000 g/mol How many PVC repeat units are present in this molecule, approximately? (a 318 (b) 465 (c) 953 (d) 1271 (e) 1398 Compute the direct end-to-end length of a coiled PTFE molecule featuring a degree of polymerization of 185,000. (a) 0.094 mu m (b) 23.3 mu m (c) 46.5 mu m (d) 53.7 mu m (e) 107.5 mu m Large bricks are made of ABS plastic, a three-component comprised of Acrylonitrile, Butadiene, repeat units. Specifically, the architecture of such polymers features a polybutadiene primary with a poly(styrene-acrylonitrile) copolymer. Which of the schematics is with this polymer architechture?Explanation / Answer
Ans 1 e. They are all of equal lengths.
All four polymers have repeating units of 2 carbon each , except PP (poly propene) which as three carbons in its repeating unit , but 1 is incorporated as methyl group in its branching . So all polymers have molecules of primarily 2 carbons, hence they all are of equal length.
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