Abstract
Abstract The changes in the crosslink density, elastically effective chains and entanglements in the network, and the molecular weights between crosslinks of three different commercially available structural silicone sealants used in glazing applications were monitored as a function of specific aging factors. The aging variables included simultaneous exposure to ozone and moisture in which the pH of the moisture was maintained at discrete levels in the acid and the alkaline range. The simultaneous effect of external loading on the performance of these sealants was also studied. Unexposed and unstressed test samples kept at ambient laboratory conditions were used as the control. Results of these weathering studies indicate that the crosslink density of the sealants will decrease during the initial period as a result of their exposure, and some surface cracking was observed. However, following this initial exposure period, the sealants showed an increase in the crosslinking activity. All three formulations ...
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