Code
|
First-step polymerization
|
Second-step polymerization
|
---|
iBEA/IBoAa
|
Time (h)
|
Conversion of iBEA/IBoA (%)
|
M
n/104
|
M
w/M
n
|
2EHA/HEAa
|
Time (h)
|
Conversion of iBEA/IBoA/2EHA/HEAb (%)
|
---|
B1
|
1050/0
|
9
|
58/–
|
2.3
|
1.16
|
1650/300
|
13
|
66/0/65/80
|
B2
|
600/300
|
22
|
59/25
|
3.1
|
1.31
|
2200/300
|
8
|
75/31/62/69
|
- Polymerization conditions: [AMVN]/[AIBN] = 1.4/1.0 in the molar ratio to the DPDT and iBEA/anisole = 1/1 in weight at 60 °C. The homopolymerization of iBEA or the copolymerization of iBEA and IBoA was carried out during the first-step polymerization, and then 2EHA and HEA were added to synthesize the block copolymers during the second-step polymerization
-
a Molar ratio to DPDT
-
b The conversions for iBEA and IBoA indicate the total values of the first- and second-step polymerizations