The table lists molecular weight data for nylon 6,6 polymer. COmpute the followi
ID: 486022 • Letter: T
Question
The table lists molecular weight data for nylon 6,6 polymer. COmpute the following items below. Use an overall Give/Find methodology
a)Molecular weight of the repeat unit
b)wt% nitrogen in the polymer
c)at% nitrogen in the polymer
d) number-average molecular weight
e) weight-average molecular weight
f) degree of polymerization
g) reflect on what the degree of polymerization means
4.5 The following table lists molecular weight data for a nylon 6,6 polymer. Compute the following items below. Use an overall Give/Find methodology for the problem (2 pts). (a) Molecular weight of the repeat unit (3 pts) (b) wt% nitrogen in the polymer (2 pts) (c) at%nitrogen in the polymer (2 pts) (d) number-average molecular weight (4 pts) (e) weight-average molecular weight (4 pts) degree of polymerization (2 pts) (g) reflect on what the degree of polymerization means (2 pts) Molecular Weight Range (g/mo) 0.03 10.000-20.000 0.01 20.000-30.000 0.09 0.04 30.000-10.000 0.15 0.11 0.25 0.23 40.000-50.000 50.000-60.000 0.22 0.24 0.18 60.000-70.000 0.14 70.000-50.000 0.08 0.12 80,000-90,000 0.07Explanation / Answer
1. Molecular folmula is C12H22O2N2
The repeat unit molecular weight
= 12(C)+22(H) + 2(O) + 2(N)
= 12(12) + 22(1) + 2(16) + 2(14)
= 226 g/mol
2. Weight % of N2
= Weight of N2/ Total Weight
= (28/226) * 100
= 12.38 %
3.
Mol. Wt
Mean value
Xi
Xi*Mi
Wi
Mi*Wi
10000-20000
15000
0.03
450
0.01
150
20000-30000
25000
0.09
2250
0.04
1000
30000-40000
35000
0.15
5250
0.11
3850
40000-50000
45000
0.25
11250
0.23
10350
50000-60000
55000
0.22
12100
0.24
13200
60000-70000
65000
0.14
9100
0.18
11700
70000-80000
75000
0.08
6000
0.12
9000
80000-90000
85000
0.04
34000
0.07
5950
Total = 49800 g/mol
Total = 55200 g/mol
So number average MW = 49800 g/mol and Weight average MW = 55200 g/mol
4. Degree of polymerization
= number avg. MW/ Unit MW
= 49800/226
= 220
Mol. Wt
Mean value
Xi
Xi*Mi
Wi
Mi*Wi
10000-20000
15000
0.03
450
0.01
150
20000-30000
25000
0.09
2250
0.04
1000
30000-40000
35000
0.15
5250
0.11
3850
40000-50000
45000
0.25
11250
0.23
10350
50000-60000
55000
0.22
12100
0.24
13200
60000-70000
65000
0.14
9100
0.18
11700
70000-80000
75000
0.08
6000
0.12
9000
80000-90000
85000
0.04
34000
0.07
5950
Total = 49800 g/mol
Total = 55200 g/mol
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