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Modified Soybean Oil-extended SBR Compounds and Vulcanizates

Li, Jiaxi
http://rave.ohiolink.edu/etdc/view?acc_num=akron1398348924

Abstract Details

2014, Master of Science in Polymer Engineering, University of Akron, Polymer Engineering.
Petroleum oils are widely used as plasticizers in rubber products, however, they are nonrenewable and in some cases harmful to the environment. Renewable soybean oil (SO) was studied to replace the petroleum oils in rubber products, but their performance properties are inferior. Therefore, the present study is an attempt to improve mechanical properties of the SO extended rubber through modification of SO. In this study, SBR compound and 60 phr of carbon black (CB) filled SBR compounds and vulcanizates containing 30 phr of SO, modified soybean oil (MSO) and naphthenic oil (NO) were prepared. The MSO is norbornylized SO prepared through the reaction of SO and dicyclopentadiene of different ratios at a pressure of 0.14-0.21 MPa and 240°C. The power consumption and discharge temperature during compounding, curing behavior, thermal properties, gel fraction, crosslink density, bound rubber fraction, mechanical properties, dynamic properties and the reaction between the SO, MSO and the curatives were evaluated. It was found that SBR/MSO compounds and vulcanizates showed a lower Tg than those of SBR/NO leading to a better low temperature performance, and better thermal stability. SBR/MSO compounds also indicated a shorter curing time and a lower maximum torque compared to those of the SBR/NO compounds. The bound rubber fraction of the CB-filled SBR/MSO compounds decreased with an increase of the modification level. Swelling test indicated that with an increase of the modification level, the gel fraction of the SBR/MSO vulcanizates slightly increased and the crosslink density decreased. Unfilled and CB-filled SBR/MSO vulcanizates exhibited lower modulus and higher tensile properties in comparison with unfilled and CB-filled SBR/NO vulcanizates. After adjusting the curative recipe, SBR/MSO vulcanizates indicated an increased modulus and showed a similar strength and an increase of the elongation at break by more than 100% compared to the SBR without any oil. The SBR/MSO vulcanizates also had similar abrasion resistance and a lower hardness than the SBR/NO vulcanizate. The performance predictors from the dynamic analysis of CB-filled SBR/MSO vulcanizates indicated better traction but higher rolling resistance compared to the CB-filled SBR/NO vulcanizate. After adjusting the recipe, CB-filled SBR/MSO vulcanizates exhibited similar traction and lower rolling resistance than the CB-filled SBR/NO vulcanizate. The addition of MSO to SBR showed improved thermal and mechanical properties and had a promising possibility to replace petroleum oils in the rubber.
Avraam Isayev, Dr. (Advisor)
Thein Kyu, Dr. (Committee Member)
Younjin Min, Dr. (Committee Member)
119 p.
Polymers
soybean oil; SBR;

Recommended Citations

Citations

  • Li, J. (2014). Modified Soybean Oil-extended SBR Compounds and Vulcanizates [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1398348924

    APA Style (7th edition)

  • Li, Jiaxi. Modified Soybean Oil-extended SBR Compounds and Vulcanizates. 2014. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1398348924.

    MLA Style (8th edition)

  • Li, Jiaxi. "Modified Soybean Oil-extended SBR Compounds and Vulcanizates." Master's thesis, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1398348924

    Chicago Manual of Style (17th edition)

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