Fractionation of Poly1-Decene Based Oil Synthesized with AlCl 3 /Ethanol Cationic Catalyst in the Presence of Toluene Solvent Amene Rahbar, Naeimeh Bahri-Laleh, Sevda Dehghani, and Mehdi Nekoomanesh (&) Department of Polymerization Engineering, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran m.nekoomanesh@ippi.ac.ir Abstract. Polya-olefin oil (PAO) was synthesized via cationic oligomerization of 1-decene as monomer, aluminum chloride as catalyst, ethanol as coactivator and toluene as solvent. Oligomer product was fractionated by distillation in vacuum and each fraction was characterized using viscometry, HNMR and GPC tech- niques. Analyses results showed that the fractions with higher boiling point and molecular weights had lower aromatic contents and higher viscosity index (VI). Keywords: 1-decene Á Cationic oligomerization Á Polyalphaolefin oil Á Fractionation Á Microstructure 1 Introduction Polya-olefin oils (PAOs) are saturated hydrocarbons used as synthesized base stock oils. These materials in comparison with the mineral oils have some advantages including high viscosity index, low pour point, good thermal and oxidative stability and low toxicity. In addition, in low molecular weights they are biodegradable. They have wide applications, for example, in transmission fluids, gear, engine, and hydraulic oils as well as greases [1, 2]. In the synthesis of PAOs, linear a-olefins such as 1-decene, 1-octene, and 1-hexene have been used and generally, the best results were obtained with 1-decene monomer. Cationic catalysts are used in the industrial synthesis of PAOs. A remarkable feature of PAOs obtained with this process is the huge variety of structural isomers that the oligomer fractions consist of [1]. In this study, we pre- pared a poly1-decene based oil via cationic oligomerization and fractionalized by distillation technique under high vacuum condition. After successful fractionation, different fractions were analyzed by GPC, viscosity and HNMR methods to find a relationship between PAO microstructure and viscosity index. © Springer Nature Switzerland AG 2020 H. Mirzadeh and A. A. Katbab (Eds.): ISPST 2018, Eco-friendly and Smart Polymer Systems, pp. 67–70, 2020. https://doi.org/10.1007/978-3-030-45085-4_17