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OCR for page 21
21
140
120
100
% Break Strain
80
60
y = 0.6014x + 29.214
40
R2 = 0.984
20
0
0 20 40 60 80 100 120 140 160
Filter Screen Size (Mesh)
Figure 17. The effect of melt filtration on the percentage break strain of
100% MCRG.
mesh size. The results for both sets of results are shown in The Effect of Silicone Rubber
Figures 19 and 20. The tests run on the 100% MCRG were
at 70°C. One of the advantages of the BAM test is that the fractured
The results of these experiments revealed that the degree of surface can be examined to see where the crack started. Exam-
melt filtration is an important parameter for using recycled ples are shown in Figures 21 and 22.
materials. It appears as if filtration at a mesh size in excess of The clear, rubbery material was identified as silicone rubber
100 mesh should be a minimum requirement. However, the by Fourier transform infrared (FTIR) analysis. The IR results
results of the BAM test did not show as much improvement are shown in Figure 23.
in the results with filtration as one might think. The reason Four different rubbery particles were tested, and they all
for this is found in the next section. looked the same. It is not clear where the silicone rubber came
600
500
Break Strain (%)
400
300
200
y = 2.0632x + 158.23
2
100
R = 0.9937
0
0 20 40 60 80 100 120 140 160
Filter Mesh Size
Figure 18. The effect of melt filtration on the percentage break
strain of 50/50 MCRG/MDPE.
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400
350
300
Failure Time (Hrs)
250
200
150
100
50
0
0 20 40 60 80 100 120 140 160
Filter Mesh Size
Figure 19. The effect of melt filtration on the BAM failure time of
100% MCRG at 70°C.
120
100
BAM Failure Time (hrs)
80
60
40
20
0
0 20 40 60 80 100 120 140 160
Filter Mesh Size
Figure 20. The effect of melt filtration on the BAM failure time of
50/50 MCRG/MDPE at 80°C.
Figure 21. BAM test fracture surfaces for failure times of 11 h (left) and 133 h (right) (unfiltered).
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Figure 22. BAM test fracture surfaces for failure times of 12 h (left) and 172 h (right) (100 mesh).
%T
CM1
Figure 23. Fourier transform infrared (FTIR) spectra for HDPE (top), the rubbery contaminant
(middle), and the best library match, silicone rubber.
