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Title: Measuring effect of the blooming of chemical curatives on the rate of cyclic fatigue crack growth in natural rubber filled with a silanized silica nanofiller
Authors: Saeed, Farhan
Ansarifar, Ali
Ellis, Robert J.
Haile-Meskel, Yared
Issue Date: 2012
Publisher: © John Wiley and Sons
Citation: SAEED, F. ... et al., 2012. Measuring effect of the blooming of chemical curatives on the rate of cyclic fatigue crack growth in natural rubber filled with a silanized silica nanofiller. Journal of Applied Polymer Science, 124 (2), pp.1372-1383.
Abstract: Two rubber compounds with different amounts of chemical curatives were prepared by mixing natural rubber with a high loading of a sulfur-bearing silanized precipitated amorphous white silica nanofiller. The chemical bonding between the filler and rubber was optimized via the tetrasulfane groups of the silane by adding a sulfenamide accelerator and zinc oxide. The rubber compounds were cured and stored at ambient temperature for 65 days before they were tested. One compound showed extensive blooming as a function of storage time. Thin tensile strips of the rubber vulcanizates containing an edge crack were repeatedly stressed at constant strain amplitude and test frequency at ambient temperature and crack length c was measured as a function of the number of cycles n. The cut growth per cycle, dc/dn, was calculated and plotted against the tearing energy, T. The blooming of the chemical curatives increased dc/dn by up to an order of magnitude at a constant T. This was due to the reagglomeration of the chemical curatives in the rubber and also within a thin layer approximately 15 to μm in size beneath the rubber surface. Under repeated stressing, cracks grew through the relatively weak agglomerated areas in the rubber and this caused the rate of crack growth to increase at a constant T.
Description: This is the peer reviewed version of the following article: SAEED, F. ... et al., 2012. Measuring effect of the blooming of chemical curatives on the rate of cyclic fatigue crack growth in natural rubber filled with a silanized silica nanofiller. Journal of Applied Polymer Science, 124 (2), pp.1372-1383, which has been published in final form at: http://dx.doi.org/10.1002/app.34913. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Version: Accepted for publication
DOI: 10.1002/app.34913
URI: https://dspace.lboro.ac.uk/2134/26487
Publisher Link: http://dx.doi.org/10.1002/app.34913
ISSN: 0021-8995
Appears in Collections:Published Articles (Materials)

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