1998
DOI: 10.5254/1.3538521
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Crosslink Density Distributions in NR/BR Blends: Effect of Cure Temperature and Time

Abstract: Crosslink distributions in gum natural rubber (NR)/cis-poly(butadiene) (BR) blend vulcanizates have been studied previously for cure states ranging from times shortly after the onset of cure to over-cure at 150 and 175 °C, respectively. The effects of lower cure temperatures on the crosslink distributions through the cure in NR/BR blend vulcanizates are considered here. The results of this and the previous work indicate that at temperatures above 140 °C the BR phase in gum NR/BR blends begins curing before and… Show more

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Cited by 21 publications
(12 citation statements)
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“…Furthermore, it should be noted that NR and SBR phases must have different network structures as a consequence of the cure time of each blend and the migration of curatives between both phases [8,15,46,47]. This effect could be enhanced by increasing the cure temperature [10], in our case from 433 K to 443 K. Then, when analyzing NR/SBR blends not only the amount of crosslinks formed during the cure process must be taken into consideration for the analysis of the rheometer curves, but also how they are distributed in both phases and the interphase.…”
Section: Resultsmentioning
confidence: 95%
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“…Furthermore, it should be noted that NR and SBR phases must have different network structures as a consequence of the cure time of each blend and the migration of curatives between both phases [8,15,46,47]. This effect could be enhanced by increasing the cure temperature [10], in our case from 433 K to 443 K. Then, when analyzing NR/SBR blends not only the amount of crosslinks formed during the cure process must be taken into consideration for the analysis of the rheometer curves, but also how they are distributed in both phases and the interphase.…”
Section: Resultsmentioning
confidence: 95%
“…The same behavior is also expected for the overcured NR phase. However, it must be considered that during the vulcanization process there is a migration of curatives from the SBR to the NR phase [8,10], and this process compensates the degradation effect of the network in the NR phase.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Diffusion of curatives and reaction rates are also different at different cure temperatures in BR and IR. For example, in a given blend, different cure conditions can favor the cross‐linking of one polymer rather than other . As a result, cross‐link distribution also varies, making the characterization of cured blends particularly challenging .…”
Section: Introductionmentioning
confidence: 99%
“…Analytical techniques have been developed to differentiate the crosslink density in elastomeric blends for both filled and unfilled systems. Three of the most interesting techniques reported in the literature are freezing point depression, swollen state nuclear magnetic resonance spectroscopy, and differential swelling 8–12. Questions remain as to how representative the results are with these different techniques.…”
Section: Introductionmentioning
confidence: 99%