ฉันรักแปลFig 4 shows the detected calcium ions concentration from
simulated solutions for silicone rubbers with different hardness (a)
and from different solutions for silicone rubber with hardness of 40
(b). Despite that the leaching trend of calcium is very similar to that
of silicon, the calcium concentrations in all tested solutions are less
than 1.0 mgL1. The results suggest that the major weight loss of
silicone rubbers in simulated solution is attributed to the leaching
of silicon based materials as also reported in literature where silicone
resins were soaked in regular and accelerated durability test
solutions [13,26]. The effect of cation contaminant on the proton
conductivity of polymer electrolyte membranes has been analyzed
both theoretically [35] and experimentally [36]. It was found that
contaminant tolerance limit for divalent cation is about 380 ppm
[35]. Since leached calcium ions were clearly detected, the degradation
of silicon rubbers would affect the proton conduction of
membranes. In addition, the leached silicon based materials can
also affect the properties of gas diffusion media as described in