Chemistry Reference
In-Depth Information
Methyl methacrylate
ð
M
1
Þ
:
r
1
5
1
:
65
Acrylamide
ð
M
2
Þ
:
r
1
5
0
:
5
Styrene
ð
M
1
Þ
:
r
1
5
1
:
13
Acrylamide
ð
M
2
Þ
:
r
1
5
0
:
60
9-12
Following is a sample polycondensation recipe:
Ethylene glycol 2 mol
Adipic acid 1.90 mol
Tricarballylic acid (1,2,3-propanetricarboxylic acid) 0.051 mol
(a) At what degree of conversion (
p
) will the mixture gel according to the
concepts described in
Section 9.9
?[
Hint:
In bifunctional condensation
polymerizations the weight average degree of polymerization of the
reaction mixture is (1
p
) (Eq. 7-35)].
(b) How does this estimated gel point differ from that calculated with the
aid of the Carothers equation (Section 7.4.2)? What is the reason for
the difference in the two estimates?
p
)/(1
1
2
References
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