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Bio-Based Polyricinoleate and Polyhydroxystearate: Properties and Evaluation as Viscosity Modifiers for Lubricants

Hélène Méheust 1 Jean-François Le Meins 2 Etienne Grau 1, * Henri Cramail 1, *
* Corresponding author
1 Team 2 LCPO : Biopolymers & Bio-sourced Polymers
LCPO - Laboratoire de Chimie des Polymères Organiques
2 Team 3 LCPO : Polymer Self-Assembly & Life Sciences
LCPO - Laboratoire de Chimie des Polymères Organiques
Abstract : This paper aims to design bio-based polyester as a viscosity modifier for lubricant properties. Bio-based polyricinoleate (PRic) and its saturated homologous polyhydroxystearate (PHS) have been synthesized from fatty acid methyl esters. The polycondensation performed in bulk in a one-step reaction without any purification leads to two series of polyesters within a large range of molecular weights, with Mw between 3 and 130 kg·mol–1. Their thermal properties were investigated. Good thermal stability was observed with degradation temperatures above 300 °C. As expected, PRic appeared to be amorphous with a particularly low glass-transition temperature, while PHS is semicrystalline. A rheological study determined that polyricinoleate entangled when its molecular weight was above 25 kg·mol–1. These two bio-based and biodegradable polymers were then evaluated as viscosity modifiers in both organic and mineral oils. PHS with high molecular weights appeared to be an excellent thickener as well as a good viscosity index improver with a viscosity index (VI) increase above +50 in organic lubricant oil and +64 in mineral oil.
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Submitted on : Wednesday, January 13, 2021 - 5:27:29 PM
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Hélène Méheust, Jean-François Le Meins, Etienne Grau, Henri Cramail. Bio-Based Polyricinoleate and Polyhydroxystearate: Properties and Evaluation as Viscosity Modifiers for Lubricants. ACS Applied Polymer Materials, American Chemical Society, In press, ⟨10.1021/acsapm.0c01153⟩. ⟨hal-03109425⟩

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