Polymers Question 91
Question: Number average molecular mass, $ {{\overline{M}} _{n}} $ and weight average molecular mass $ ( {{\overline{M}} _{w}} ) $ of synthetic polymers are related as
Options:
A) $ {{\overline{M}} _{n}}={{({{\overline{M}} _{w}})}^{1/2}} $
B) $ {{\overline{M}} _{n}}={{\overline{M}} _{w}} $
C) $ {{\overline{M}} _{w}}>{{\overline{M}} _{n}} $
D) $ {{\overline{M}} _{w}}<{{\overline{M}} _{n}} $
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Answer:
Correct Answer: C
Solution:
[c] $ PDI=\frac{{{\overline{M}} _{w}}}{{{\overline{M}} _{n}}} $ For synthetic polymer, PDI > 1
$ \therefore {{\overline{M}} _{w}}>{{\overline{M}} _{n}} $
BETA
