Sample Name: Poly(styrene-b-ethylene oxide)
1H
NMR spectrum of the sample
3.65 ppm
Sample #: P2808-SEO
Structure:
CH2
CH
p2808-SEO
6.4 7.2 ppm
b
n
CH2
CH2
O
m
Composition:
Mn x 103
S-b-EO
384.0-8.0
PDI
1.0
25.4
1.15
Synthesis Procedure:
Poly(styrene-b-ethylene oxide) diblock copolymer is prepared
by living anionic polymerization.
SEC profile of the block copolymer
Characterization:
P 2 8 0 8 -S E O
The molecular weight and polydispersity index (PDI) of the
block copolymer are characterized by size exclusion
chromatography (SEC).
The composition of the block
copolymer was calculated from 1H-NMR by comparing the
peak area of the phenyl polystyrene protons between 6.4 to 7.2
ppm and the ethylene oxide protons at 3.65 ppm.
.
Solubility:
The polymer is soluble in THF (at 35 °C), CHCl3, benzene,
toluene, dioxane. Low molecular weight SEO with high
contents of the polyethylene oxide block can also be solubilized
in methanol and water.
16
17
18
19
20
21
22
23
24
25
26
27
28
V e (m l)
S ize exclu sion chro m a tograph y of poly(styren e-b -eth yle ne oxide)
P oly(styren e ), M n = 38 4 00 0 , M w = 4 0 75 00 , P I= 1 .0 6
B lock C o po lym e r P S t(3 84 0 00 )-b -P E O (8 0 00 ), P I= 1 .1 5
Thermal analysis of the sample# P2808-SEO
Thermal analysis of the samples was carried out on a TA Q100
differential scanning calorimeter at a heating rate of
20oC/min.The midpoint of the slope change of the heat flow
plot of the second heating scan was considered as the glass
transition temperature (Tg).
Thermal analysis results at a glance
For PS block Tg: 102oC
For PEO block
Tg: Not distinct
Tm: 59oC
Tc: Not found
Melting curve for the PEO block
Thermogram for the sample
The melting temperature (Tm) was taken as the maximum of the
endothermic peak where as the crystallization temperature (Tc)
was considered as the minimum of the exothermic peak.
For PS block
0.7
-0.47
107.13°C
-0.48
0.6
H eat Flow (W /g )
H e a t F lo w (W /g )
101.87°C(T)
95.30°C
0.5
-0.49
58.72°C
-0.50
0.4
-0.51
-0.52
52
0.3
80
Exo Up
85
90
95
100
Temperature (°C)
105
110
115
120
Universal V4.2E TA Instruments
Exo Up
54
56
58
Temperature (°C)
60
62
64
Universal V4.2E TA Instruments