Effect of Sulfur Rank on the Chemorheology of Crosslinked Polysulfide Elastomers

摘要

The chemical stress relaxation of a series of 10 mole per cent crosslinked poly(ethylene polysulfides) of varying sulfur ranks was investigated. In addition, the effect of carbon black on the chemical relaxation time of lightly crosslinked disulfide polymers is discussed. It is concluded that stress decay in the elastomers studied can be well represented by a simple exponential decay law although a sum of two exponentials 'fits' the data somewhat better. It is also concluded that the major portion of stress decay in crosslinked polysulfides occurs by the reversible scission and bond interchange of polysulfide linkages of rank greater than two. (Author)