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O
O
H
O
H
PTSA, MeOH
O
O
H
O
C
H
3
i
x
O
O
CHCl
3
, 6-12 h
i
O
x
P3HB4HB
O
P3HB4HB-OH
N
H
2
O
dichloroethane
triethylamine
5-8 h @ 80°C
O
O
Cl
H
2
N
N
O
C
H
3
H
N
H
2
O
O
a
b
i
x
Polyethyleneimine
O
P3HB4HB-acrylated
CHCl
3
45 - 50°C
24 h
N
H
2
O
O
H
2
N
N
O
C
H
3
H
H
O
O
i
a
b
x
Polyethyleneimine
P3HB4HB-acrylated
O
Figure 7.4 PHA modification by monohydroxylation and subsequent graft polymerization by Michael addition.
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