Chemistry Reference
In-Depth Information
Table 3.5
Relative reactivities of the benzoyloxy radical at 60
C
Monomer
K
0
/
K
00
(mol/L)
Structure
Acrylonitrile
0.12
N
Methyl methacrylate
0.30
OCH
3
O
Vinyl acetate
0.91
O
O
Styrene
2.50
2,5-dimethylstyrene
5.0
Addition to monomer/decomposition rates [
51
,
52
]
Table 3.6
Relative rates of reactions of the sulfate ion-radical with
some monomers [
51
,
52
]
Monomer
Structure
Relative rates
K
00
/
K
0
10
3
Methyl methacrylate
7.7
OCH
3
O
10
3
Methyl acrylate
1.1
OCH
3
O
10
4
Acrylonitrile
3.9
N
M
n
was found to be 15,000. The same is true of homopolymerizations of several other dialkyl fumarates
and also dialkyl maleates [
64
-
66
]. The polymerization rates and the sizes of the polymers that form
decrease with increases in the lengths of linear alkyl ester groups. There is, however, an opposite
correlation if the ester groups are branched. Also, the maleate esters appear to isomerize to fumarates
prior to polymerization [
66
].
Homopolymerizations of diethyl fumarate by free-radical mechanism were reported [
63
]. The
