Effect of chain extender on properties of silicone rubber sealant

Jiesheng Liu; Shaopeng Wu

doi:10.1117/12.851543

14 April 2010 Effect of chain extender on properties of silicone rubber sealant

Jiesheng Liu, Shaopeng Wu

Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 75223K (2010) https://doi.org/10.1117/12.851543
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

Abstract

The room-temperature vulcanizing silicone rubber sealant was prepared with chain extender. The effect of chain extender on the properties of silicone rubber sealant was discussed. The composite samples with chain extender were investigated from the aspects of tack-free time, cross-linkage density, hardness (penetration number) and adhesive strength with the concrete slab. It was found that the adding of the chain extender effectively makes the molecular chain length increase and causes the mechanical properties improvement. In addition, the increase in the amount of the chain extender reduces the cross-linkage density and hardness of silicone rubber sealant, which is accompanied with a decrease in the tack-free time. Adhesive strength is one of the most important requirements for sealant. The effect of chain extender on the adhesive strength was also investigated in this study. It was found that the increase in the amount of the chain extender makes the adhesive strength between the sealant and the concrete slab decrease.

Citation Download Citation

Jiesheng Liu and Shaopeng Wu "Effect of chain extender on properties of silicone rubber sealant", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75223K (14 April 2010); https://doi.org/10.1117/12.851543

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