Figure 1b shows the chemical structure of a tetrafluroethylene molecule and Table 1b gives the molecular weight data for a polytetrafluroethylene (PTFE) material. Compute: (i) The number average molecular weight. (ii) The weight average molecular weight. (iii) The number average degree of polymerisation. (iv) The weight average degree of polymerisation. (v) The polydispersity index.
Figure 1b shows the chemical structure of a tetrafluroethylene molecule and Table 1b gives the molecular weight data for a polytetrafluroethylene (PTFE) material. Compute: (i) The number average molecular weight. (ii) The weight average molecular weight. (iii) The number average degree of polymerisation. (iv) The weight average degree of polymerisation. (v) The polydispersity index.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Question
Figure 1b shows the chemical structure of a tetrafluroethylene
molecule and Table 1b gives the molecular weight data for a
polytetrafluroethylene (PTFE) material. Compute:
(i) The number average molecular weight.
(ii) The weight average molecular weight.
(iii) The number average degree of polymerisation.
(iv) The weight average degree of polymerisation.
(v) The polydispersity index.
Transcribed Image Text:Molecular Weight
Range (g/mol)
10,000-20,000
20,000-30,000
30,000-40,000
40,000-50,000
50,000-60,000
60,000-70,000
70,000-80,000
80,000-90,000
Xi
(Number fraction)
0.03
0.09
0.15
0.25
0.22
0.14
0.08
0.04
Wi
(Weight fraction)
0.01
0.04
0.11
0.23
0.24
0.18
0.12
0.07
Table 1b. Molecular weight data for a polytetrafluroethylene (PTFE) material
Transcribed Image Text:F
F
C=C
F F
Figure 1b. Chemical structure of Tetrafluroethylene.
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