| Select Chapter >> | TOC | Preface | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | Appendices |
Chapter 9: Reaction Mechanisms, Pathways, Bioreactions and Bioreactors
Example 9.4: Calculate Xn for Monomers with the Same End Groups
Initially we have 10 polymer molecules of ARA and 10 polymer
molecules of BR¢ B, for a total of 20 structural units (10 R and
10R¢ ), a total of 20 A functional groups and 20 B functional
groups. At time t there are seven polymer molecules and the
distribution of molecules at time t is shown in the table below.
Calculate the fractional conversion of functional groups, p, and the
number average chain length 
.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Solution
MA0 = Number of functional groups of A initially = 20
MA = Number of functional groups of A remaining = 7
N0 = Number of polymer molecules initially.
N = Number of polymer molecules remaining at time t
or
