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What factors affect the 35-minute and 50-minute elongation at break during the production of emulsion polybutadiene styrene rubber?
Mennicke size, degree of cross-linking, molecular weight distribution, as well as the size and distribution of latex particles all affect set stretch.
The styrene content in SBR also has an impact; as the styrene content increases, both the stress at fixed strain and the tensile strength increase
Set elongation is mainly related to the degree of crosslinking in rubber; therefore, any factors that affect the degree of crosslinking will also influence set elongation. In the production of styrene-butadiene rubber, possible factors include molecular weight and its distribution, acid soap content, and volatile matter content.