Engineering Science 1021A/B Lecture Notes - Lecture 28: Repeat Unit, Polymerization
17 May 2018
School
Department
Professor
Degree of polymerization: average length of a linear polymer
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m: molecular weight of mer (repeat unit)
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Molecular Weight
Properties of polymers depend heavily on the molecules length
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2 ways to calculate average molecular weight
Number average molecular weight
Indication of the weight that is most common
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x"
: number of chains in the
i$%
weight range
□
M"
: middle of the
i$%
weight range
□
§
1.
Weight average molecular weight
An indication of the average weight of each chain in the sample
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w": weight fraction of chains in the i$% weight range
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M": middle of the i$% weight range
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2.
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Degree of Polymerization Example
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Degree of Polymerization
