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Toward Replacement of Petroleum Plasticizer by Modified Soybean Oil in Rubbers

Li, Jiaxi
http://rave.ohiolink.edu/etdc/view?acc_num=akron1493021647746537

Abstract Details

2017, Doctor of Philosophy, University of Akron, Polymer Engineering.
Petroleum-based plasticizers are widely used to lower the viscosity of rubber compounds, increase processability and decrease cost. However, some popular petroleum-based plasticizers such as aromatic oils are considered as carcinogenic due to the high polycyclic aromatic hydrocarbon (PAH) content. Bio-based oil such as soybean oil (SO) has recently emerged as sustainable replacement for petroleum-based plasticizers in rubbers. However, such replacement often comes with tradeoffs and deficiency in certain properties. Modified SO includes norbornylized SO (NSO) and isoprene modified SO (ISO) prepared through the reaction of SO with diene including dicyclopentadiene (DCPD) or isoprene, is a green and low cost solution. After the reaction, the C=C double bonds in the SO can be converted into cycloaliphatic groups, which have higher reactivity. Different modification levels can be achieved. The present research studied the effect of modified SO in different rubber matrices including uncoupled and tin-coupled styrene-butadiene rubber (SBR), chloroprene rubber (CR) and butyl rubber (IIR). Different filler systems including carbon black (CB), precipitated silica and their mixture (hybrid filler) and also different curing systems including sulfur, metal oxide and phenolic resin were used. Rheological, thermal, dynamic, mechanical, abrasion and aging properties of rubbers containing modified SO were compared with those containing virgin SO and a petroleum-based naphthenic oil (NO). Results showed that SO and modified SO react with various additives such as curatives and silane coupling agent during the curing process and change various properties. SBR and CR containing NSO showed improved elongation at break, tensile strength, cure rate and aging resistance than those containing NO or SO. IIR containing SO and NSO showed improvement of all the above properties except some decrease of tensile strength. However, all rubbers containing SO and NSO showed a decrease of modulus in compassion with those containing NO. Both SO and NSO provided rubbers with better thermal stability and lower glass transition temperature than NO. With proper adjustment to the curing recipe, tin-coupled SBR containing NSO was found to be suitable for manufacturing tires, since it showed desirable dynamic properties predicting better wet traction, lower rolling resistance and also better abrasion resistance simultaneously, compared with those containing NO. Uncoupled SBR containing NSO and ISO showed similar trend. The systematic study showed that NSO and ISO could be good replacements for petroleum-based rubber plasticizers in various rubber compounds along with improved performances and safety.
Avraam Isayev (Advisor)
Mark Soucek (Advisor)
Younjin Min (Committee Chair)
Yu Zhu (Committee Member)
Lu-Kwang Ju (Committee Member)
214 p.
Polymers
Rubber; Soybean Oil; Plasticizer

Recommended Citations

Citations

  • Li, J. (2017). Toward Replacement of Petroleum Plasticizer by Modified Soybean Oil in Rubbers [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1493021647746537

    APA Style (7th edition)

  • Li, Jiaxi. Toward Replacement of Petroleum Plasticizer by Modified Soybean Oil in Rubbers. 2017. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1493021647746537.

    MLA Style (8th edition)

  • Li, Jiaxi. "Toward Replacement of Petroleum Plasticizer by Modified Soybean Oil in Rubbers." Doctoral dissertation, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1493021647746537

    Chicago Manual of Style (17th edition)

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