b. Tor F 1. IfD 1.20 for polymer mix A and D -1.05 for polymer mix B, then mix 2

Question

b. Tor F 1. IfD 1.20 for polymer mix A and D -1.05 for polymer mix B, then mix 2. Any man-made collection of polymers always has a polydispersity index 3. The higher the average molecular weight of a polymer mix the higher the 4. With a broad MWD, one achieves better mechanical properties (e.g 5. A molecular weight obtained by measuring a colligative property (e.g 6. Melt strength will be higher for a narrow MWD mix than for a broad MWD 7. Because of its desirable properties, a narrow MWD is always preferred 8. The increased degree and frequency of entanglements is the main reason A has a broader MWD than mix B. greater than one. mechanical properties (e.g. tensile strength) increase. tensile strength) in a polymer. eezing point depression or osmotic pressure) corresponds to M mix of polymer. over a broad MWD when it comes to molding a polymer high MW polymers have superior mechanical properties.

Explanation / Answer

1. True.

2. False. Because anionic polymerization leads to DP= 1

3. True

4. True

5. True. The molecular weight obtained by measuring the colligative properties like freezing point depression or osmotic pressure corresponds to Mn that is number average molecular weight

6. False. Broad MWD will have higher melt viscosities and hence would have higher melt strength

7. True, because of the uniformity of the molecular chain, they will orient equally

8. True

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