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. 2018 May 13;10(5):522. doi: 10.3390/polym10050522

Figure 4.

Figure 4

SEM images of silicone rubbers exposed to the environments under temperature cycling from −20 °C~90 °C, (a) original; (b) 50 cycles in pH = 3.35 solution; (c) 100 cycles in pH = 3.35 solution; (d) 150 cycles in pH = 3.35 solution; (e) 200 cycles in pH = 3.35 solution; (f) 50 cycles in pH = 5 solution; (g) 100 cycles in pH = 5 solution; (h) 150 cycles in pH = 5 solution; (i) 200 cycles in pH = 5 solution; (j) 50 cycles in de-ionized water; (k) 100 cycles in de-ionized water; (l) 150 cycles in de-ionized water; (m) 200 cycles in de-ionized water; (n) 50 cycles in air; (o) 100 cycles in air; (p) 150 cycles in air; (q) 200 cycles in air; (r) voids and cracks.