tertiary creep. Furthermore, addition of carbon black into
the blend reduces total creep of the composite since CB
particles would distribute in vacancy spaces between
IPNs. For that reason, CB distribution would confine the
movement of polymer chains when they were under
constant load.
0
10
20
30
40
50
60
70
80
90
PMMA
Compressive strength ( MPa)
Ratio of PMMA/PUcomposite (wt%)
no CB
5 wt % CB
* Over than maximum loading of universal testing machine.
Fig. 3 Compressive strength of MMA/PU/CB composites.
The surface and volume electrical conductivity of
difference weight fraction PMMA/PU/CB composites is
displayed in Figure 7-9. The percolation s-curve of them
had appeared the percolation threshold at 3wt% of CB for
and PMMA/PU
(
75:25 of ratio) and 2 wt% of CB for
0
10
20
30
40
50
Stress (MPa)
Ratio of PMMA/PU/CB composite (wt%)
Yield Strength at 2% offset
Secant Modulus
Fig. 4 Yield strength and secant modulus of PMMA/PU/CB
composite difference weight fraction
PMM
P
PMMA/PU ratio 40:60 no IPN
PMMA/PU/CB IPNs 80:20/5 wt% CB
IPNs 97.77
0.60 % (x20, 000)
Fig.5 SEM images of PMMA, PU, PMMA/PU blend membrane
and PMMA/PU/CB blend with IPNs
(a)
(d)
(c)
(b)
*
CB
PMMA
2.00
2.00
m
2013 International Conference on Alternative Energy in Developing Countries and Emerging Economies
- 332 -
