Environmentally Degradation of r-PMMA/PMMA-Blend-PU/Ecoflex ...

Environmentally Degradation of r-PMMA/PMMA-Blend-PU/Ecoflex Sheet 1039
Table 1 Percentage of IPNs and impact strength of r-PMMA/PMMA-blend-PU/Ecoflex.
MMA:r-PMMA:PU
(%wt)
72:3:25
71:4:25
Amount of ecoflex
Impact strength (kJ/m 2 )
%IPNs
(phr)
Izod
Charpy
GP - 8.16 ± 0.14 13.96 ± 0.21
0 98.50 ± 0.46 23.39 ± 0.41 29.31 ± 1.32
1.0 96.43 ± 0.38 13.26 ± 0.77 17.58 ± 0.09
2.0 96.97 ± 0.10 12.05 ± 0.07 15.40 ± 0.61
3.0 97.39 ± 0.28 15.16 ± 1.68 21.87 ± 0.45
4.0 96.08 ± 0.46 13.57 ± 0.16 17.60 ± 1.83
5.0 94.75 ± 0.12 11.96 ± 1.12 16.13 ± 1.64
0 99.21 ± 0.05 19.51 ± 0.73 24.11 ± 0.57
1.0 96.96 ± 0.66 16.25 ± 1.38 21.07 ± 1.90
2.0 96.98 ± 0.89 14.47 ± 0.14 18.10 ± 0.09
3.0 98.25 ± 0.24 17.06 ± 1.74 23.80 ± 1.34
4.0 97.33 ± 1.80 14.78 ± 0.11 18.12 ± 0.44
5.0 95.98 ± 0.80 14.75 ± 0.29 19.58 ± 1.18
GP = general purpose of PMMA from PAN ASIA Industry Co., Ltd..
(a)
(b)
(c)
(d)
Fig. 2 SEM micrographs of r-PMMA/PMMA-blend-PU/Ecoflex sheet (× 1,000: scale bar = 10 m). (a) 3%
r-PMMA/PMMA-blend-PU; (b) 3% r-PMMA/PMMA-blend-PU + EF 3 phr; (c) 4% r-PMMA/PMMA-blend-PU; (d) 4%
r-PMMA/PMMA-blend-PU + EF 3 phr.
distributed in the PMMA matrix correspond to
compatibility of MMA, PU and EF.
3.3 The Ultraviolet Degradation
The ultraviolet degradation of r-PMMA/PMMAblend-PU/Ecoflex
sheet was examined by monitoring
the change of impact strengths. The results are shown
in Table 2. The impact strength of specimens were
slightly decreased due to the ultraviolet was activated
PMMA to form methyl methacrylate free radical.
However, the impact strength of r-PMMA/
PMMA-blend-PU/Ecoflex sheet were less changed
both of Izod and Charpy type. These results
demonstrated
that