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Effect of Carbon Black on the Tearing of Dicumyl Peroxide (DCP)-cured Natural Rubber Vulcanizates

Li, Zhenpeng
http://rave.ohiolink.edu/etdc/view?acc_num=akron1398358292

Abstract Details

2014, Master of Science, University of Akron, Polymer Science.
Dumbbell specimens have been prepared from dicumyl peroxide (DCP)-cured natural rubber (NR) vulcanizates containing 0-60 phr of carbon black (N115). For normal specimens with no pre-cut, tensile strength increases as the carbon black level increases up to 45 phr, and then slightly decreases. When a pre-cut is introduced, specimens with 6-25 phr carbon black are weaker than gum (unfilled) specimens, and rupture occurs by lateral growth of a single crack. Specimens with 38 phr carbon black have similar strength as the gum, and multiple cracks and crack deflection occur before rupture. Specimens with 45-60 phr carbon black are stronger than gum, and rupture occurs via multiple cracks and crack deflection. The difference in cut growth resistance with low and high levels of black is attributed to competitive effects. A bound rubber/continuous network first forms at 15 phr of black. Tearing of DCP-cured vulcanizates has been compared with sulfur-cured ones. Sulfur-cured vulcanizates have normal tensile strengths that are similar for all levels of black (0-60 phr). Cut growth resistance of sulfur-cured specimens is much greater than DCP-cured specimens at all levels of black. The onset of reinforcement for sulfur-cured vulcanizates is 15 phr of black, while for DCP-cured vulcanizates, it is 38 phr of black.
Gary Hamed, Dr. (Advisor)
Ali Dhinojwala, Dr. (Committee Member)
110 p.
Polymers
Carbon Black; Tearing; Dicumyl Peroxide; DCP; Natural Rubber

Recommended Citations

Citations

  • Li, Z. (2014). Effect of Carbon Black on the Tearing of Dicumyl Peroxide (DCP)-cured Natural Rubber Vulcanizates [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1398358292

    APA Style (7th edition)

  • Li, Zhenpeng. Effect of Carbon Black on the Tearing of Dicumyl Peroxide (DCP)-cured Natural Rubber Vulcanizates. 2014. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1398358292.

    MLA Style (8th edition)

  • Li, Zhenpeng. "Effect of Carbon Black on the Tearing of Dicumyl Peroxide (DCP)-cured Natural Rubber Vulcanizates." Master's thesis, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1398358292

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.