Preparation of Oligo (Hexene-1-So-Indenes) and Investigation of Its Products as Additives to Oils
Abstract
It has been carried out the copolymerization reactions of hexene-1 and indene with participation of BF3·O(C2H5)2 as the catalyst, the yield, the composition, the structure, the copolymerization constant and the average molecular weight values depending on cooligomerization condition have been determined. It has been shown that a location of links in the prepared cooligomers has a statistic character, but the blocks organized by molecules of hexene-1 may be included. Thermal stability of the synthesized cooligomers of hexene-1-indene has been investigated both individually and in fatty solution and it has been elucidated that an increase of a quantity of indene links in cooligomer composition leads to increase of thermal stability and an increase of the molecular weight decreases a thermal stability. An inclusion of the synthesized cooligomers in composition of M-6 oil as synthetic component increases a viscosity index value and gives it anticorrosion property.
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Introduction
Using the oligomer and cooligomer as synthetic component in the composition of the oils one can prepare the oils with high viscosity index [1-3]. Most of the oils intended for surface technique are prepared by this method, so they are mixed with 1- alkene oligomers and cooligomers at various ratios.
The numerous investigations have been carried out in the direction of use of cooligo- and copolymers of 1-alkenes with a number of vinyl monomers and dicyclopentadiene as additives to petroleum oils [4-8]. At the same time a use of hexene-1 as a basic monomer and also its copolymers with indene as viscous additives for oils is also of interest. It was known that an introduction of the aromatic fragments in polymer chain increases their stability to actions, and an introduction of dicyclopentadiene fragments leads to that the prepared macromolecular compounds show anticorrosion and depressor properties in the composition of lubricating oils. The indene molecule combines both aromatic and carbocyclic fragment, therefore it is subjected to cooligomerization with hexene-1.
Conclusion
It has been carried out the copolymerization reactions of hexene-1 and indene with participation of BF3·O(C2H5)2 as the catalyst, and the yield, the composition, the structure, the copolymerization constant and the average molecular weight values depending on cooligomerization condition have been determined. The cooligomerization constant values (for hexene-1 – r1=1.35±0,05, for indene – r2=0.23±0,01) have been determined at low depth of conversion of comonomers. It has been shown that a location of links in the prepared cooligomer has a statistic character, but the blocks prepared from molecules of hexene-1 may be included.
Thermal stability of the synthesized cooligomers of hexene-1-indene has been investigated both individually and in oil solution and it has been elucidated that an increase of quantity of indene links in cooligomer composition leads to increase of thermal stability, and an increase of molecular weight decreases a thermal stability.
An inclusion of the synthesized cooligomers in a quantity of 20-30% in composition of M-6 oil as synthetic component increases a viscosity index value from 78 to 94÷106 and gives it anticorrosion property.