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- W2009732018 abstract "Tensile retraction measurements have been made on unfilled rubbers cured with either sulfur or dicumyl peroxide to different levels of crosslink density. The rubbers chosen were emulsion and solution polymerized anionic SBRs, cis-polybutadiene, natural rubber, and anionic 1,4-polybutadienes of different molecular weight. The measured molecular weight between crosslinks (Mc) at each extension gave a smooth curve when plotted against the maximum extension (Λmax) used for the measurement. This curve was separated into three linear regions that characterize the cured rubber. The first region, above about 30% elongation, gave a Λmax = 1 intercept that decreased with either increased polymer Mn or increased level of curatives. Subtracting this calculated crosslink density from the measured crosslink density below about 30% elongation gave another smooth curve when plotted against Λmax. A second linear relationship was described in the general range of 5-30% elongation. Below about 5% elongation, a third linear relationship was found. This line was determined from the differences between the calculated and the observed crosslink densities in the lowest strain region of the intermediate strain plot. Possible explanations of these three linear regions have been made. Supporting evidence was gained from temperature-dependent experiments as well as from correlation of experimental results with polymers of different values of Tg." @default.
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- W2009732018 date "1991-03-20" @default.
- W2009732018 modified "2023-10-17" @default.
- W2009732018 title "Tensile retraction measurements. IV. Determination of loose end pullout in gum vulcanizates" @default.
- W2009732018 doi "https://doi.org/10.1002/app.1991.070420628" @default.
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