Compression set property and stress–strain behavior during compression of polysulfide sealants

Abstract

In this article, mechanical and compression set properties, swelling property, and stress-strain behavior during compression of polysulfide sealants based on different polysulfide resin were investigated. The results showed that molecular weight and cross-linking agent of liquid polysulfide resin had significant influence on mechanical and compression set properties of the sealants. The sealants based on higher molecular weight polysulfide resin had higher mechanical properties. At the same time, lower cross-linking agent in polysulfide resin produced lower cross-link density and higher swelling property, which resulted in higher compression set value of the sealant. However, when different molecular weight polysulfide resins were used in the sealant simultaneously, the testing results indicated that the compression performance of the sealants was significantly enhanced, while mechanical properties of the sealants kept nearly unchanged.

Comparison of two high temperature treatment methods on preparing electrically conductive polysulfide/Ag composites for aerospace sealant applications

“…The desired physical and mechanical properties were accomplished by modifying with epoxides or isocyanate end groups, along with different filler systems. 1,[3][4][5][6] The need for electrical conductivity in aircraft fuel tank sealants arises from the safety concerns in dissipating the static charges built up from friction or in the case of lightning strikes. [7][8][9][10][11] Traditional sealants are based on polymeric adhesives that are electrical insulators.…”

The investigation on the curing process of polysulfide sealant by in situ dielectric analysis

“…Many publications can also be found on the characterization of PSF sealants, by the use of thermogravimetry analysis, dynamic mechanical analysis (DMA), tensile strength, and hardness testing 5–9. In our previous study, chemical modification of PSF‐based sealants has been studied to yield an improved mechanical property 10–13…”

The effect of epoxy resin to reduce the compression set of polysulfide sealant

“…One of the reasons is their relatively higher compression set due to incidental slide between chains and interchange reactions between disulfide linkages 5. Our previous work revealed that fillers,17 molecular weight and cross‐linkage content of polysulfide resin18 have important effect on reducing the compression set of sealants. In this article, we describe another simple method to reduce compression set by introducing DGEBA epoxy resin into polysulfide sealant.…”