Design of dual hydrophobic–hydrophilic polymer networks for highly lubricious polyether-urethane coatings

Peter T.M. Albers, Stefan P.W. Govers, Jozua Laven, Leendert G.J. van der Ven, Rolf A.T.M. van Benthem, Gijsbertus de With (Corresponding author), A. Catarina C. Esteves (Corresponding author)

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Abstract

Bio-lubricated surfaces found in nature have inspired the design of low friction polymer coatings for biomedical
applications. This work presents a systematic study of the relation between the network structure parameters
and the macroscopic friction properties of highly lubricious dual hydrophobic/hydrophilic polyurethane (PU)
coatings in an aqueous environment. Chemically cross-linked PU coatings were prepared by adding poly(ethylene
glycol) mono-methyl ether (mPEG) as hydrophilic dangling chains, or poly(ethylene glycol) (PEG)-diol as
hydrophilic elastically active network chains, to poly(propylene glycol) (PPG)-PU coating formulations. The
friction behaviour of the water swollen coatings was measured using a custom-made water immersed tribology
setup. Addition of the PEG segments or mPEG dangling chains to hydrophobic PPG coatings greatly enhances the
lubricious properties of the coatings. These dual hydrophobic/hydrophilic diol PU network exhibit a surface with
a lower coefficient of friction compared to reference coatings from either individual precursors, demonstrating a
large synergistic effect between the hydrophobic PPG and the hydrophilic PEG in the coatings. Based on network
structure and surface chain considerations it is hypothesized that the existence of a thin and softer hydrated
surface layer on top of a less hydrated, more rigid, coating bulk layer gives rise to the observed enhanced
lubricious properties, hereby mimicking to some extent bio-lubricated systems, such as cartilage.
LanguageEnglish
Pages82-94
JournalEuropean Polymer Journal
Volume111
DOIs
StatePublished - 1 Feb 2019

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urethanes
Polyethers
Polymers
coatings
Coatings
Propylene Glycol
glycols
polymers
Glycols
propylene
Polyurethanes
Propylene
Friction
Polyethylene glycols
friction
Ethylene glycol
ethylene
polyetherurethane
Active networks
Methyl Ethers

Cite this

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abstract = "Bio-lubricated surfaces found in nature have inspired the design of low friction polymer coatings for biomedicalapplications. This work presents a systematic study of the relation between the network structure parametersand the macroscopic friction properties of highly lubricious dual hydrophobic/hydrophilic polyurethane (PU)coatings in an aqueous environment. Chemically cross-linked PU coatings were prepared by adding poly(ethyleneglycol) mono-methyl ether (mPEG) as hydrophilic dangling chains, or poly(ethylene glycol) (PEG)-diol ashydrophilic elastically active network chains, to poly(propylene glycol) (PPG)-PU coating formulations. Thefriction behaviour of the water swollen coatings was measured using a custom-made water immersed tribologysetup. Addition of the PEG segments or mPEG dangling chains to hydrophobic PPG coatings greatly enhances thelubricious properties of the coatings. These dual hydrophobic/hydrophilic diol PU network exhibit a surface witha lower coefficient of friction compared to reference coatings from either individual precursors, demonstrating alarge synergistic effect between the hydrophobic PPG and the hydrophilic PEG in the coatings. Based on networkstructure and surface chain considerations it is hypothesized that the existence of a thin and softer hydratedsurface layer on top of a less hydrated, more rigid, coating bulk layer gives rise to the observed enhancedlubricious properties, hereby mimicking to some extent bio-lubricated systems, such as cartilage.",
author = "Albers, {Peter T.M.} and Govers, {Stefan P.W.} and Jozua Laven and {van der Ven}, {Leendert G.J.} and {van Benthem}, {Rolf A.T.M.} and {de With}, Gijsbertus and Esteves, {A. Catarina C.}",
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AU - Govers,Stefan P.W.

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AU - van der Ven,Leendert G.J.

AU - van Benthem,Rolf A.T.M.

AU - de With,Gijsbertus

AU - Esteves,A. Catarina C.

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N2 - Bio-lubricated surfaces found in nature have inspired the design of low friction polymer coatings for biomedicalapplications. This work presents a systematic study of the relation between the network structure parametersand the macroscopic friction properties of highly lubricious dual hydrophobic/hydrophilic polyurethane (PU)coatings in an aqueous environment. Chemically cross-linked PU coatings were prepared by adding poly(ethyleneglycol) mono-methyl ether (mPEG) as hydrophilic dangling chains, or poly(ethylene glycol) (PEG)-diol ashydrophilic elastically active network chains, to poly(propylene glycol) (PPG)-PU coating formulations. Thefriction behaviour of the water swollen coatings was measured using a custom-made water immersed tribologysetup. Addition of the PEG segments or mPEG dangling chains to hydrophobic PPG coatings greatly enhances thelubricious properties of the coatings. These dual hydrophobic/hydrophilic diol PU network exhibit a surface witha lower coefficient of friction compared to reference coatings from either individual precursors, demonstrating alarge synergistic effect between the hydrophobic PPG and the hydrophilic PEG in the coatings. Based on networkstructure and surface chain considerations it is hypothesized that the existence of a thin and softer hydratedsurface layer on top of a less hydrated, more rigid, coating bulk layer gives rise to the observed enhancedlubricious properties, hereby mimicking to some extent bio-lubricated systems, such as cartilage.

AB - Bio-lubricated surfaces found in nature have inspired the design of low friction polymer coatings for biomedicalapplications. This work presents a systematic study of the relation between the network structure parametersand the macroscopic friction properties of highly lubricious dual hydrophobic/hydrophilic polyurethane (PU)coatings in an aqueous environment. Chemically cross-linked PU coatings were prepared by adding poly(ethyleneglycol) mono-methyl ether (mPEG) as hydrophilic dangling chains, or poly(ethylene glycol) (PEG)-diol ashydrophilic elastically active network chains, to poly(propylene glycol) (PPG)-PU coating formulations. Thefriction behaviour of the water swollen coatings was measured using a custom-made water immersed tribologysetup. Addition of the PEG segments or mPEG dangling chains to hydrophobic PPG coatings greatly enhances thelubricious properties of the coatings. These dual hydrophobic/hydrophilic diol PU network exhibit a surface witha lower coefficient of friction compared to reference coatings from either individual precursors, demonstrating alarge synergistic effect between the hydrophobic PPG and the hydrophilic PEG in the coatings. Based on networkstructure and surface chain considerations it is hypothesized that the existence of a thin and softer hydratedsurface layer on top of a less hydrated, more rigid, coating bulk layer gives rise to the observed enhancedlubricious properties, hereby mimicking to some extent bio-lubricated systems, such as cartilage.

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