Determine:(i) The weight average molecular weight and the degree ofpolymerization. (ii)The number average molecular weight and the degree ofpolymerization.(iii) What is the polydispersity index for this material?(b) A sample of a polyethylene rope weighs 15.12 g per cm. If each chaincontains 7000 repeat units, calculate, the number of polyethylene chains ina 3 m rope. (a)An analysis of a sample of polyethylene (Figure Q2) reveals that there are sixlengths of chain with the number of chains of each length shown in Table Q2.PolyethyleneNumber of ChainsRepeating (Mer)StructureIIHHFigure Q2. Repeating mer structure for polyethylene.10,00018,00017,00015,0009,0004,000HHIT-c-c-Mean Molecular Weight ofChains (g/mol)3,0006,0009,00012,00015,00018,000Table Q2. Analysis of polyethylene sample.

Answered: An analysis of a sample of polyethylene…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

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Determine:

(i) The weight average molecular weight and the degree of
polymerization.

(ii)The number average molecular weight and the degree of
polymerization.
(iii) What is the polydispersity index for this material?
(b) A sample of a polyethylene rope weighs 15.12 g per cm. If each chain
contains 7000 repeat units, calculate, the number of polyethylene chains in
a 3 m rope.

(a)
An analysis of a sample of polyethylene (Figure Q2) reveals that there are six
lengths of chain with the number of chains of each length shown in Table Q2.
Polyethylene
Number of Chains
Repeating (Mer)
Structure
II
HH
Figure Q2. Repeating mer structure for polyethylene.
10,000
18,000
17,000
15,000
9,000
4,000
HH
IT
-c-c-
Mean Molecular Weight of
Chains (g/mol)
3,000
6,000
9,000
12,000
15,000
18,000
Table Q2. Analysis of polyethylene sample.

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