Thermal and photodegradation of MnO2-, NaBO3- and organic hydroperoxide-cured polysulfides: products and pathways

A series of polysulfide-based polyureas with different siloxane contents were synthesized, and they were based on isophorone diisocyanate, liquid polysulfide oligomer, aminoethylaminopropyl poly(dimethyl siloxane) (AEAPS), and 2,5-diamino-3,6-dimethylmercapto-toluene. The mechanical and surface properties were investigated with attenuated total reflectance Fourier transform infrared spectroscopy, surface contact angles, electron spectroscopy for chemical analysis, and stress-strain analysis. Siloxane was enriched on the surfaces of these elastomers, and the tensile properties of the elastomers did not change markedly with the AEAPS modification.

Section: Introductionmentioning

confidence: 99%

Mechanical and surface properties of polysulfide‐based polyurea modified with aminoethylaminopropyl poly(dimethylsiloxane)

Quan

Fang

Chen

2002

“…Many publications can be found on the characterization of polysulfide cured by metal peroxides,5–9 reporting the results of thermogravimetry analysis, dynamic mechanical analysis, tensile strengths, and hardness testing. Thermal stability and photodegradation of the liquid polysulfide and cured polysulfide were also studied by Mahon et al10, 11 In our earlier research work, structure, mechanical properties, and modification of polysulfide‐based sealants have been studied 12–16…”

Section: Introductionmentioning

confidence: 96%

Effect of filler on the compression set, compression stress–strain behavior, and mechanical properties of polysulfide sealants

Zhang

Chang

et al. 2010

In this work, investigations were made on the mechanical properties, stress-strain behavior during compression, swelling and compression set properties of polysulfide sealants at different carbon black and silicon dioxide loadings, and dynamic mechanical thermal analysis was also presented. The results reveal that carbon black filler indeed has significant effects on reinforcing mechanical properties of polysulfide sealants. Increasing carbon black loading improves the tensile strength of sealants promptly, but compression performance increases slowly. The simultaneous use of carbon black and silicon dioxide filler in polysulfide sealants hardly changes the tensile strength of sealants, whereas the ultimate elongation and compression performance of sealants are enhanced remarkably.

“…They are marked by their adherence to glass, steel, wood, and concrete, their good low‐temperature properties and low water‐vapor transmission, and their high resistance to UV radiation and the environment 3, 4. Many publications can be found on the characterization of polysulfide sealants,5–11 reporting the results of thermogravimetry analysis, dynamic mechanical analysis, tensile strengths, hardness testing, thermal stability, and photodegradation of the liquid polysulfide and cured polysulfide. In our earlier work, structure, mechanical properties, and modification of polysulfide‐based sealants have been studied 12–16…”

Section: Introductionmentioning

confidence: 99%

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

Zhang¹,

Wang²,

Ding³

et al. 2011

In this article, modified polysulfide sealants with lower compression set were prepared by a simple method of introducing the diglycidyl ether of bisphenol A resin (DGEBA epoxy resin) into sealants. The investigation on reactivity analysis and gel faction test verified that the incorporation of epoxy resin in sealants was just a blending process rather than copolyaddition with polysulfide resin. Stress–strain behavior during compression revealed that the epoxy resin could reduce the compression stress when the sealants were loaded to a certain strain, which effectively lessened crosslink breakages and benefited to compression resistance. Also the rigid phenyl structure in epoxy resin may retard incidental slide between polysulfide chains and prevent interchange reactions between disulfide linkages. The incorporation of 2 phr epoxy resin distinctly reduced compression set of polysulfide sealant from 28.3% to 11.2% after compressed 25% at 23°C for 1 day. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012