Thickening Mechanisms of Polyisobutylene in Polyalphaolefin

Michelle Len; Uma Shantini Ramasamy; Seth Lichter; Ashlie Martini

doi:10.1007/s11249-017-0960-3

Thickening Mechanisms of Polyisobutylene in Polyalphaolefin

Michelle Len, Uma Shantini Ramasamy, Seth Lichter, Ashlie Martini^*

^*Corresponding author for this work

Mechanical Engineering

Research output: Contribution to journal › Article

3 Scopus citations

Abstract

Molecular dynamics simulations are used to study the effect of polyisobutylene polymer on the viscosity of polyalphaolefin base oil. The Newtonian viscosities of the solution calculated from simulations at 40 and 100 °C agree with rheometer measurements. The simulations are used to investigate three possible mechanisms by which the polymer may increase solution viscosity. The results indicate that neither (1) coil expansion nor (2) polymer–polymer association underlie viscosity enhancement in the case studied here. Measurements of solvent reorientation close to the additive molecule suggest that (3) modification of the solvent by the additive molecule contributes to viscosity enhancement.

Original language	English (US)
Article number	5
Journal	Tribology Letters
Volume	66
Issue number	1
DOIs	https://doi.org/10.1007/s11249-017-0960-3
State	Published - Mar 1 2018

Keywords

Polyisobutylene
Polymer association
Radius of gyration
Viscosity modifiers
Viscosity–temperature

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Surfaces and Interfaces
Surfaces, Coatings and Films

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10.1007/s11249-017-0960-3

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Len, M., Ramasamy, U. S., Lichter, S., & Martini, A. (2018). Thickening Mechanisms of Polyisobutylene in Polyalphaolefin. Tribology Letters, 66(1), [5]. https://doi.org/10.1007/s11249-017-0960-3

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abstract = "Molecular dynamics simulations are used to study the effect of polyisobutylene polymer on the viscosity of polyalphaolefin base oil. The Newtonian viscosities of the solution calculated from simulations at 40 and 100 °C agree with rheometer measurements. The simulations are used to investigate three possible mechanisms by which the polymer may increase solution viscosity. The results indicate that neither (1) coil expansion nor (2) polymer–polymer association underlie viscosity enhancement in the case studied here. Measurements of solvent reorientation close to the additive molecule suggest that (3) modification of the solvent by the additive molecule contributes to viscosity enhancement.",

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