Civil Engineering Reference
In-Depth Information
As we can see in Figure 13.7 the loss modulus increased slightly with temperature
up to 165°C and dropped at er showing a peak. h e peak in loss modulus increased
and shit ed to higher temperatures as the kenaf whiskers increased. h e value of loss
modulus at 80 and 165°C as listed in Table 13.6 were increased by factors of 1, 2, 2.2,
and 3.3 at 2.5, 5, 7.5, and 10 wt% kenaf whiskers content, respectively. h e improvement
showed by increment of kenaf whiskers reinforcement into the CAB matrix is believed
to be due to whiskers-whiskers interactions through hydrogen bonding. Kenaf whis-
kers reinforcement has an ability to improve storage modulus of the matrix at a wide
range of temperatures even in small amounts because of their large specii c surface
area. Nanoreinforcement of the whiskers has the ability to af ect the mobility of poly-
mer chain in the matrix [6].
6
5
2.5%
5%
4
7.5%
1.0%
0%
3
35
50
65
80
95
110
125
140
155
170
185
Temperature (°C)
Figure 13.6
Storage modulus (E') for dif erent percentages of whiskers reinforcement as a function of
temperature.
5.5
4.5
0%
2.5%
5%
7.5%
10%
3.5
2.5
35
50
65
80
95
110
125
140
155
170
Temperature (°C)
Figure 13.7
Loss modulus of nanocomposites at dif erent kenaf whiskers content.
