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Jurku̅nas M, Talaikis M, Klimkevičius V, Pudžaitis V, Niaura G, Makuška R. Diblock Copolymers of Methacryloyloxyethyl Phosphorylcholine and Dopamine Methacrylamide: Synthesis and Real-Time Adsorption Dynamics by SEIRAS and RAIRS. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:5945-5958. [PMID: 38456424 PMCID: PMC10956495 DOI: 10.1021/acs.langmuir.3c03925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 02/18/2024] [Accepted: 02/23/2024] [Indexed: 03/09/2024]
Abstract
Amphiphilic diblock copolymers containing a block of 2-methacryloyloxyethyl phosphorylcholine (MPC) with unique properties to prevent nonspecific protein adsorption and enhance lubrication in aqueous media and a block of dopamine methacrylamide (DOPMA) distinguished by excellent adhesion performance were synthesized by reversible addition fragmentation chain transfer (RAFT) polymerization for the first time. The DOPMA monomer with an acetonide-protected catechol group (acetonide-protected dopamine methacrylamide (ADOPMA)) was used, allowing the prevention of undesirable side reactions during polymerization and oxidation during storage. The adsorption behavior of the diblock copolymers with protected and unprotected catechol groups on gold surfaces was probed using attenuated total reflection (ATR)-Fourier transform infrared (FTIR) spectroscopy, surface-enhanced infrared absorption spectroscopy (SEIRAS), and reflection-absorption infrared spectroscopy (RAIRS). The copolymers pMPC-b-pADOPMA demonstrated physisorption with rapid adsorption and ultrasound-assisted desorption, while the copolymers pMPC-b-DOPMA exhibited chemical adsorption with slower dynamics but a stronger interaction with the gold surface. SEIRAS and RAIRS allowed proving the reorientation of the diblock copolymers during adsorption, demonstrating the exposure of the pMPC block toward the aqueous phase.
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Affiliation(s)
- Marijus Jurku̅nas
- Institute
of Chemistry, Vilnius University, Naugarduko Str. 24, 03225 Vilnius, Lithuania
| | - Martynas Talaikis
- Department
of Organic Chemistry, Center for Physical
Sciences and Technology (FTMC), Sauletekio Ave. 3, 10257 Vilnius, Lithuania
| | - Vaidas Klimkevičius
- Institute
of Chemistry, Vilnius University, Naugarduko Str. 24, 03225 Vilnius, Lithuania
| | - Vaidas Pudžaitis
- Department
of Organic Chemistry, Center for Physical
Sciences and Technology (FTMC), Sauletekio Ave. 3, 10257 Vilnius, Lithuania
| | - Gediminas Niaura
- Department
of Organic Chemistry, Center for Physical
Sciences and Technology (FTMC), Sauletekio Ave. 3, 10257 Vilnius, Lithuania
| | - Ričardas Makuška
- Institute
of Chemistry, Vilnius University, Naugarduko Str. 24, 03225 Vilnius, Lithuania
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Synthesis of Superhydrophilic Gradient-Like Copolymers: Kinetics of the RAFT Copolymerization of Methacryloyloxyethyl Phosphorylcholine with PEO Methacrylate. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Bioinspired Bottlebrush Polymers for Aqueous Boundary Lubrication. Polymers (Basel) 2022; 14:polym14132724. [PMID: 35808769 PMCID: PMC9269121 DOI: 10.3390/polym14132724] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 06/30/2022] [Accepted: 07/01/2022] [Indexed: 01/30/2023] Open
Abstract
An extremely efficient lubrication system is achieved in synovial joints by means of bio-lubricants and sophisticated nanostructured surfaces that work together. Molecular bottlebrush structures play crucial roles for this superior tribosystem. For example, lubricin is an important bio-lubricant, and aggrecan associated with hyaluronan is important for the mechanical response of cartilage. Inspired by nature, synthetic bottlebrush polymers have been developed and excellent aqueous boundary lubrication has been achieved. In this review, we summarize recent experimental investigations of the interfacial lubrication properties of surfaces coated with bottlebrush bio-lubricants and bioinspired bottlebrush polymers. We also discuss recent advances in understanding intermolecular synergy in aqueous lubrication including natural and synthetic polymers. Finally, opportunities and challenges in developing efficient aqueous boundary lubrication systems are outlined.
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Krüger JM, Choi CY, Lossada F, Wang P, Löschke O, Auhl D, Börner HG. Broadening the Chemical Space of Mussel-Inspired Polymerization: The Roll-out of a TCC-Polymer Platform with Thiol–Catechol Connectivities. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c02192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jana M. Krüger
- Department of Chemistry, Laboratory for Organic Synthesis of Functional Systems, Humboldt-Universität zu Berlin, Brook-Taylor Straße 2, 12489 Berlin, Germany
| | - Ching-Yi Choi
- Department of Chemistry, Laboratory for Organic Synthesis of Functional Systems, Humboldt-Universität zu Berlin, Brook-Taylor Straße 2, 12489 Berlin, Germany
| | - Francisco Lossada
- Department of Chemistry, Laboratory for Organic Synthesis of Functional Systems, Humboldt-Universität zu Berlin, Brook-Taylor Straße 2, 12489 Berlin, Germany
| | - Peng Wang
- Department of Polymer Materials and Technologies, Technische Universität Berlin, Ernst-Reuter-Platz 1, 10587 Berlin, Germany
| | - Oliver Löschke
- Department of Polymer Materials and Technologies, Technische Universität Berlin, Ernst-Reuter-Platz 1, 10587 Berlin, Germany
| | - Dietmar Auhl
- Department of Polymer Materials and Technologies, Technische Universität Berlin, Ernst-Reuter-Platz 1, 10587 Berlin, Germany
| | - Hans G. Börner
- Department of Chemistry, Laboratory for Organic Synthesis of Functional Systems, Humboldt-Universität zu Berlin, Brook-Taylor Straße 2, 12489 Berlin, Germany
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Wojas NA, Dobryden I, Wallqvist V, Swerin A, Järn M, Schoelkopf J, Gane PAC, Claesson PM. Nanoscale Wear and Mechanical Properties of Calcite: Effects of Stearic Acid Modification and Water Vapor. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:9826-9837. [PMID: 34355909 PMCID: PMC8397405 DOI: 10.1021/acs.langmuir.1c01390] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 07/26/2021] [Indexed: 06/13/2023]
Abstract
Understanding the wear of mineral fillers is crucial for controlling industrial processes, and in the present work, we examine the wear resistance and nanomechanical properties of bare calcite and stearic acid-modified calcite surfaces under dry and humid conditions at the nanoscale. Measurements under different loads allow us to probe the situation in the absence and presence of abrasive wear. The sliding motion is in general characterized by irregular stick-slip events that at higher loads lead to abrasion of the brittle calcite surface. Bare calcite is hydrophilic, and under humid conditions, a thin water layer is present on the surface. This water layer does not affect the friction force. However, it slightly decreases the wear depth and strongly influences the distribution of wear particles. In contrast, stearic acid-modified surfaces are hydrophobic. Nevertheless, humidity affects the wear characteristics by decreasing the binding strength of stearic acid at higher humidity. A complete monolayer coverage of calcite by stearic acid results in a significant reduction in wear but only a moderate reduction in friction forces at low humidity and no reduction at 75% relative humidity (RH). Thus, our data suggest that the wear reduction does not result from a lowering of the friction force but rather from an increased ductility of the surface region as offered by the stearic acid layer. An incomplete monolayer of stearic acid on the calcite surface provides no reduction in wear regardless of the RH investigated. Clearly, the wear properties of modified calcite surfaces depend crucially on the packing density of the surface modifier and also on the air humidity.
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Affiliation(s)
- Natalia A. Wojas
- Bioeconomy
and Health Division, Department of Materials and Surface Design, RISE Research Institutes of Sweden, Box 5607, SE-114 86 Stockholm, Sweden
- Division
of Surface Chemistry and Corrosion Science, Department of Chemistry,
School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
| | - Illia Dobryden
- Division
of Surface Chemistry and Corrosion Science, Department of Chemistry,
School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
- Division
of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE−971 87 Luleå, Sweden
| | - Viveca Wallqvist
- Bioeconomy
and Health Division, Department of Materials and Surface Design, RISE Research Institutes of Sweden, Box 5607, SE-114 86 Stockholm, Sweden
| | - Agne Swerin
- Department
of Engineering and Chemical Sciences: Chemical Engineering, Faculty
of Health, Science and Technology, Karlstad
University, SE-651 88 Karlstad, Sweden
| | - Mikael Järn
- Bioeconomy
and Health Division, Department of Materials and Surface Design, RISE Research Institutes of Sweden, Box 5607, SE-114 86 Stockholm, Sweden
| | | | - Patrick A. C. Gane
- Department
of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P.O.
Box 16300, FI-00076 Aalto, Finland
| | - Per M. Claesson
- Bioeconomy
and Health Division, Department of Materials and Surface Design, RISE Research Institutes of Sweden, Box 5607, SE-114 86 Stockholm, Sweden
- Division
of Surface Chemistry and Corrosion Science, Department of Chemistry,
School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
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Steponaviciute M, Klimkevicius V, Makuska R. Synthesis and Properties of Cationic Gradient Brush Copolymers Carrying PEO Side Chains and Catechol Moieties. MACROMOL CHEM PHYS 2021. [DOI: 10.1002/macp.202000364] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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