Location: Bio-oils ResearchTitle: Correlations between the average molecular weight and viscosity of soybean polymercaptan Author
Submitted to: Society of Tribologists and Lubrication Engineers
Publication Type: Abstract Only
Publication Acceptance Date: 12/5/2017
Publication Date: 5/20/2018
Citation: Bantchev, G.B., Vermillion, K., Lansing, J.C., Biresaw, G. 2018. Correlations between the average molecular weight and viscosity of soybean polymercaptan [abstract]. Society of Tribologists and Lubrication Engineers Annual Meeting and Exhibition. p. 163.
Technical Abstract: Polymercaptanized soybean oil (PMSO), the product of a thiol-ene reaction between soybean oil and hydrogen sulfide, is a material of interest as a lubricant additive and polymer precursor. We investigated, with GPC, NMR (1D and 2D), GC-MS, and viscometry, the changes that occur with PMSO upon heating or UV irradiation. An almost linear increase of the average molecular weight (MW) was observed upon heat treatment (number-average MW (Mn) = 1180 Da for PMSO, Mn = 1720 Da for PMSO that was heated for 1000 h at 130°C). The Mn was the best amongst the MW averages as a predictor of the kinematic and dynamic viscosities. The polydispersity index (PDI)also increased with the heat treatment of PMSO. It correlated best with the z-average MW. For samples with close Mn, we observed that the higher PDI correlated with higher viscosity index.