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Pérez-Gómez EO, Cruz GJ, García-Rosales G, Serafín-Díaz K, Mejía MDR, González-Torres M, Gómez LM, Alvarez-Mejía L, Olayo MG. Synthesis by plasma of potentially biodegradable oxidized polyethylene obtained from ethanol. Polym Bull (Berl) 2019. [DOI: 10.1007/s00289-019-03063-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Ardhaoui M, Zheng M, Pulpytel J, Dowling D, Jolivalt C, Khonsari FA. Plasma functionalized carbon electrode for laccase-catalyzed oxygen reduction by direct electron transfer. Bioelectrochemistry 2013; 91:52-61. [DOI: 10.1016/j.bioelechem.2012.12.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Revised: 12/13/2012] [Accepted: 12/18/2012] [Indexed: 10/27/2022]
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3
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Wang Q, Uzunoglu E, Wu Y, Libera M. Self-assembled poly(ethylene glycol)-co-acrylic acid microgels to inhibit bacterial colonization of synthetic surfaces. ACS APPLIED MATERIALS & INTERFACES 2012; 4:2498-506. [PMID: 22519439 DOI: 10.1021/am300197m] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We explored the use of self-assembled microgels to inhibit the bacterial colonization of synthetic surfaces both by modulating surface cell adhesiveness at length scales comparable to bacterial dimensions (∼1 μm) and by locally storing/releasing an antimicrobial. Poly(ethylene glycol) [PEG] and poly(ethylene glycol)-co-acrylic acid [PEG-AA] microgels were synthesized by suspension photopolymerization. Consistent with macroscopic gels, a pH dependence of both zeta potential and hydrodynamic diameter was observed in AA-containing microgels but not in pure PEG microgels. The microgels were electrostatically deposited onto poly(l-lysine) (PLL) primed silicon to form submonolayer surface coatings. The microgel surface density could be controlled via the deposition time and the microgel concentration in the parent suspension. In addition to their intrinsic antifouling properties, after deposition, the microgels could be loaded with a cationic antimicrobial peptide (L5) because of favorable electrostatic interactions. Loading was significantly higher in PEG-AA microgels than in pure PEG microgels. The modification of PLL-primed Si by unloaded PEG-AA microgels reduced the short-term (6 h) S. epidermidis surface colonization by a factor of 2, and the degree of inhibition increased when the average spacing between microgels was reduced. Postdeposition L5 peptide loading into microgels further reduced bacterial colonization to the extent that, after 10 h of S. epidermidis culture in tryptic soy broth, the colonization of L5-loaded PEG-AA microgel-modified Si was comparable to the very small level of colonization observed on macroscopic PEG gel controls. The fact that these microgels can be deposited by a nonline-of-sight self-assembly process and hinder bacterial colonization opens the possibility of modifying the surfaces of topographically complex biomedical devices and reduces the rate of biomaterial-associated infection.
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Affiliation(s)
- Qichen Wang
- Department of Chemical Engineering and Materials Science, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA
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VACHEETHASANEE KATANCHALEE, WANG SHUWU, QIU YONGXING, MARCHANT ROGERE. Poly(ethylene oxide) surfactant polymers. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 15:95-110. [PMID: 15027845 PMCID: PMC1307518 DOI: 10.1163/156856204322752255] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We report on a series of structurally well-defined surfactant polymers that undergo surface-induced self-assembly on hydrophobic biomaterial surfaces. The surfactant polymers consist of a poly(vinyl amine) backbone with poly(ethylene oxide) and hexanal pendant groups. The poly(vinyl amine) (PVAm) was synthesized by hydrolysis of poly(N-vinyl formamide) following free radical polymerization of N-vinyl formamide. Hexanal and aldehyde-terminated poly(ethylene oxide) (PEO) were simultaneously attached to PVAm via reductive amination. Surfactant polymers with different PEO:hexanal ratios and hydrophilic/hydrophobic balances were prepared, and characterized by FT-IR, 1H-NMR and XPS spectroscopies. Surface active properties at the air/water interface were determined by surface tension measurements. Surface activity at a solid surface/water interface was demonstrated by atomic force microscopy, showing epitaxially molecular alignment for surfactant polymers adsorbed on highly oriented pyrolytic graphite. The surfactant polymers described in this report can be adapted for simple non-covalent surface modification of biomaterials and hydrophobic surfaces to provide highly hydrated interfaces.
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Affiliation(s)
| | - SHUWU WANG
- Department of Biomedical Engineering, Wickenden Building, Case Western Reserve University, Cleveland, OH 44106, USA
| | - YONGXING QIU
- Department of Biomedical Engineering, Wickenden Building, Case Western Reserve University, Cleveland, OH 44106, USA
| | - ROGER E. MARCHANT
- Department of Macromolecular Science, Case Western Reserve University, Cleveland, OH 44106, USA
- Department of Biomedical Engineering, Wickenden Building, Case Western Reserve University, Cleveland, OH 44106, USA
- To whom correspondence should be addressed at the Department of Biomedical Engineering. Tel.: (1-216) 368-3005. Fax: (1-216) 368-4969. E-mail:
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Chen H, Brook MA, Chen Y, Sheardown H. Surface properties of PEO–silicone composites: reducing protein adsorption. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 16:531-48. [PMID: 15887658 DOI: 10.1163/1568562053700183] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Silicone-based polymers with reduced protein adsorption were successfully prepared by incorporating mono- or bifunctional poly(ethylene oxide) (PEO) derivatives, respectively, into PDMS during rubber formation using classic room temperature vulcanization chemistry. Characterization of the films by water contact-angle measurements and XPS showed that the PEO was present on the film surface, with greater amounts of PEO at the interface modified with monofunctional PEO. Scanning electron microscopy showed the PEO domains segregated into regular zigzag patterns on the PEO-modified surfaces. Significant reductions in the adsorption of fibrinogen, albumin and lysozyme were observed on both PEO-modified surfaces, although the monofunctional PEO surfaces performed much better in this regard. The reductions in protein adsorption were comparable for all three proteins on both surfaces, suggesting that molecular mass of the protein is not a significant factor in determining the magnitude of protein deposition. Western blot studies showed that the adsorption of proteins from plasma to the monofunctional PEO-modified surfaces was also significantly reduced and surprisingly selective, with very few bands noted relative to the control surfaces and those modified with bifunctional PEO.
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Affiliation(s)
- Hong Chen
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton ON, Canada L8S 4L7
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Sask KN, Berry LR, Chan AKC, Brash JL. Modification of polyurethane surface with an antithrombin-heparin complex for blood contact: influence of molecular weight of polyethylene oxide used as a linker/spacer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:2099-2106. [PMID: 22149666 DOI: 10.1021/la203821g] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Polyurethane (PU) was modified using isocyanate chemistry to graft polyethylene oxide (PEO) of various molecular weights (range 300-4600). An antithrombin-heparin (ATH) covalent complex was subsequently attached to the free PEO chain ends, which had been functionalized with N-hydroxysuccinimide (NHS) groups. Surfaces were characterized by water contact angle and X-ray photoelectron spectroscopy (XPS) to confirm the modifications. Adsorption of fibrinogen from buffer was found to decrease by ~80% for the PEO-modified surfaces compared to the unmodified PU. The surfaces with ATH attached to the distal chain end of the grafted PEO were equally protein resistant, and when the data were normalized to the ATH surface density, PEO in the lower MW range showed greater protein resistance. Western blots of proteins eluted from the surfaces after plasma contact confirmed these trends. The uptake of ATH on the PEO-modified surfaces was greatest for the PEO of lower MW (300 and 600), and antithrombin binding from plasma (an indicator of heparin anticoagulant activity) was highest for these same surfaces. The PEO-ATH- and PEO-modified surfaces also showed low platelet adhesion from flowing whole blood. It is concluded that for the PEO-ATH surfaces, PEO in the low MW range, specifically MW 600, may be optimal for achieving an appropriate balance between resistance to nonspecific protein adsorption and the ability to take up ATH and bind antithrombin in subsequent blood contact.
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Affiliation(s)
- Kyla N Sask
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, Canada L8S 4K1
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7
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Wang JJ, Liu F. Imparting antifouling properties of silicone hydrogels by grafting poly(ethylene glycol) methyl ether acrylate initiated by UV light. J Appl Polym Sci 2011. [DOI: 10.1002/app.35687] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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8
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Bonduelle CV, Lau WM, Gillies ER. Preparation of protein- and cell-resistant surfaces by hyperthermal hydrogen induced cross-linking of poly(ethylene oxide). ACS APPLIED MATERIALS & INTERFACES 2011; 3:1740-1748. [PMID: 21491963 DOI: 10.1021/am200241b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The functionalization of surfaces with poly(ethylene oxide) (PEO) is an effective means of imparting resistance to the adsorption of proteins and the attachment and growth of cells, properties that are critical for many biomedical applications. In this work, a new hyperthermal hydrogen induced cross-linking (HHIC) method was explored as a simple one-step approach for attaching PEO to surfaces through the selective cleavage of C-H bonds and subsequent cross-linking of the resulting carbon radicals. In order to study the effects of the process on the polymer, PEO-coated silicon wafers were prepared and the effects of different treatment times were investigated. Subsequently, using an optimized treatment time and a modified butyl polymer with increased affinity for PEO, the technique was applied to butyl rubber surfaces. All of the treated surfaces exhibited significantly reduced protein adsorption and cell growth relative to control surfaces and compared favorably with surfaces that were functionalized with PEO using conventional chemical methods. Thus HHIC is a simple and effective means of attaching PEO to non-functional polymer surfaces.
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Affiliation(s)
- Colin V Bonduelle
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Canada N6A5B7
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9
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Preparation and characterization of poly(hydroxyethyl methacrylate-co -poly(ethyleneglycol-methacrylate)/hydroxypropyl-chitosan) hydrogel films: Adhesion of rat mesenchymal stem cells. Macromol Res 2011. [DOI: 10.1007/s13233-011-0412-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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10
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Al-Sabagh AM, Elsabee M, Khaled K, Eltabie AE. Synthesis of Some Surfactants Based on Polytriethanolamine and Investigation of Their Surface Active Properties. J DISPER SCI TECHNOL 2010. [DOI: 10.1080/01932690903227584] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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11
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Vasilev K, Casanal A, Challougui H, Griesser HJ. Template-assisted generation of nanocavities within plasma polymer films. J Phys Chem B 2009; 113:7059-63. [PMID: 19438274 DOI: 10.1021/jp807986k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The generation of nanosized cavities within thin film layers is of interest for a number of fundamental and applied reasons. One challenge is to make such systems sufficiently robust mechanically. Plasma polymer (pp) films possess excellent mechanical stability if deposition conditions are selected such as to achieve a sufficient density of cross-linking and resistance to extraction of polymeric material by solvents. In this study, gold nanoparticles of 15 and 70 nm diameter were used as sacrificial templates to generate nanocavities in pp films of various thickness values in the tens of nanometers range. A first pp layer was deposited onto substrates using n-heptylamine (HA) to a thickness of 20 nm. Carboxy-thiolated gold nanoparticles were electrostatically bound onto the surface amine groups of the n-heptylamine plasma polymer (HApp) layer. A second HApp layer was then coated to various thicknesses onto the nanoparticle/HApp surface. The template particles embedded thus in-between the two HApp layers were then dissolved using aqueous KCN solution; monitoring of the plasmon resonance band of the gold nanoparticles enabled verification of template stripping and measurement of the kinetics of stripping. AFM topography images showed little change on extraction of the template nanoparticles, indicating that the plasma polymer layer maintained structural integrity upon template extraction and subsequent drying, and thereby prevented collapse of the empty nanocavities. The concept of template stripping to generate controlled size free volume in thin plasma polymer layers is thus shown to produce robust structures.
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Affiliation(s)
- Krasimir Vasilev
- Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Adelaide, Australia.
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12
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Yameen B, Alvarez M, Azzaroni O, Jonas U, Knoll W. Tailoring of poly(ether ether ketone) surface properties via surface-initiated atom transfer radical polymerization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:6214-6220. [PMID: 19271778 DOI: 10.1021/la900010z] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The interfacial properties of commercial poly(ether ether ketone) (PEEK) have been tailored by tethering polymeric brushes to the PEEK surface via surface-initiated atom transfer radical polymerization (SI-ATRP). The immobilization of an ATRP initiator on the PEEK surface was achieved by an unprecedented simple two-step wet chemical method. The keto groups at the PEEK surface were first wet chemically reduced to hydroxyl groups, and then 2-bromoisobutyryl groups were covalently anchored at the PEEK surface as ATRP initiator. SI-ATRP was performed at these functionalized PEEK surfaces with the three different monomers: potassium 3-(methacryloyloxy)propane-1-sulfonate (MPS), monomethoxy-terminated oligo(ethylene glycol)methacrylate (MeOEGMA), and N-isopropylacrylamide (NIPAAm). Atomic force microscopy, scanning electron microscopy, attenuated total reflection infrared spectroscopy, water contact angle measurements, and X-ray photoelectron spectroscopy ascertained the successful grafting of these polymer brushes at the PEEK surface. These brush-modified PEEK surfaces exhibited fully the physiochemical properties of the respective polymer brush: the surface with polyMPS brush showed selective staining by electrostatic interaction, while the polyMeOEGMA-modified surface was biorepellent. The surface modified with polyNIPAAm brush demonstrated a thermally responsive polarity change.
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Affiliation(s)
- Basit Yameen
- Max-Planck-Institut fur Polymerforschung, Ackermannweg 10, D-55128 Mainz, Germany.
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Wan J, Thomas MS, Guthrie S, Vullev VI. Surface-bound proteins with preserved functionality. Ann Biomed Eng 2009; 37:1190-205. [PMID: 19308733 DOI: 10.1007/s10439-009-9673-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2007] [Accepted: 03/09/2009] [Indexed: 12/28/2022]
Abstract
Biocompatibility of materials strongly depends on their surface properties. Therefore, surface derivatization in a controllable manner provides means for achieving interfaces essential for a broad range of chemical, biological, and medical applications. Bioactive interfaces, while manifesting the activity for which they are designed, should suppress all nonspecific interaction between the supporting substrates and the surrounding media. This article describes a procedure for chemical derivatization of glass and silicon surfaces with polyethylene glycol (PEG) layers covalently functionalized with proteins. While the proteins introduce the functionality to the surfaces, the PEGs provide resistance against nonspecific interactions. For formation of aldehyde-functionalized surfaces, we coated the substrates with acetals (i.e., protected aldehydes). To avoid deterioration of the surfaces, we did not use strong mineral acids for the deprotection of the aldehydes. Instead, we used a relatively weak Lewis acid for conversion of the acetals into aldehydes. Introduction of alpha,omega-bifunctional polymers into the PEG layers, bound to the aldehydes, allowed us to covalently attach green fluorescent protein and bovine carbonic anhydrase to the surfaces. Spectroscopic studies indicated that the surface-bound proteins preserve their functionalities. The surface concentrations of the proteins, however, did not manifest linear proportionality to the molar fractions of the bifunctional PEGs used for the coatings. This finding suggests that surface-loading ratios cannot be directly predicted from the compositions of the solutions of competing reagents used for chemical derivatization.
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Affiliation(s)
- Jiandi Wan
- Department of Bioengineering, University of California, Riverside, A-220 Bourns Hall, Riverside, CA 92521, USA
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14
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Chen H, Yuan L, Song W, Wu Z, Li D. Biocompatible polymer materials: Role of protein–surface interactions. Prog Polym Sci 2008. [DOI: 10.1016/j.progpolymsci.2008.07.006] [Citation(s) in RCA: 452] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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15
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Chen H, Wang L, Zhang Y, Li D, McClung WG, Brook MA, Sheardown H, Brash JL. Fibrinolytic Poly(dimethyl siloxane) Surfaces. Macromol Biosci 2008; 8:863-70. [DOI: 10.1002/mabi.200800014] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Mikhail AS, Jones KS, Sheardown H. Dendrimer-grafted cell adhesion peptide-modified PDMS. Biotechnol Prog 2008; 24:938-44. [DOI: 10.1002/btpr.5] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Zdyrko B, Ofir PBY, Alb AM, Reed WF, Santore MM. Adsorption of copolymers aggregates: from kinetics to adsorbed layer structure. J Colloid Interface Sci 2008; 322:365-74. [PMID: 18436230 DOI: 10.1016/j.jcis.2008.03.047] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2008] [Revised: 03/24/2008] [Accepted: 03/26/2008] [Indexed: 11/16/2022]
Abstract
We examined the adsorption, on hydrophobic and hydrophilic surfaces, of 4 rake-type poly(dimethyl siloxane) (PDMS) copolymers varying the amount of poly(ethylene glycol) (PEG) graft arms from 41 to 72%. The copolymers formed large aggregates in solution, complicating their adsorption kinetics and layer structures. We found the adsorption process always to be dominated by the adsorption of large aggregates, with strongly bound layers resistant to rinsing in adsorbing buffer. Adsorbed amounts were nearly independent of the substrate. However, subtleties in the adsorption kinetics suggested different layer structures for the different systems. On hydrophilic silica, aggregates adsorbed at the transport limited rate until surface saturation, and associated interfacial structures were likely retained. On the hydrophobic surface, a subset of the copolymers exhibited retarded late stage adsorption kinetics suggestive of brush formation. This work demonstrates how subtle differences in adsorption kinetics provide insight into potential interfacial layer structures.
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Affiliation(s)
- Bogdan Zdyrko
- Department of Polymer Science and Engineering, University of Massachusetts, 120 Governors Drive, Amherst, MA 01003, USA
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18
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Effect of chain density and conformation on protein adsorption at PEG-grafted polyurethane surfaces. Colloids Surf B Biointerfaces 2008; 61:237-43. [DOI: 10.1016/j.colsurfb.2007.08.012] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2007] [Revised: 07/19/2007] [Accepted: 08/20/2007] [Indexed: 11/19/2022]
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19
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Son T, Kim D, Kim B, Koo K, Park Y, Kim J, Lim H. Stoichiometric and nonstoichiometric polyelectrolyte complex of chitosan and polyethyleneglycol-monosuccinate: Preparation and characterization. J Appl Polym Sci 2007. [DOI: 10.1002/app.25680] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Nandivada H, Chen HY, Lahann J. Vapor-Based Synthesis of Poly[(4-formyl-p-xylylene)-co-(p-xylylene)] and Its Use for Biomimetic Surface Modifications. Macromol Rapid Commun 2005. [DOI: 10.1002/marc.200500449] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Gabriel S, Dubruel P, Schacht E, Jonas AM, Gilbert B, Jérôme R, Jérôme C. Electrografting of Poly(ethylene glycol) Acrylate: A One-Step Strategy for the Synthesis of Protein-Repellent Surfaces. Angew Chem Int Ed Engl 2005; 44:5505-9. [PMID: 16052637 DOI: 10.1002/anie.200500639] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sabine Gabriel
- Center for Education and Research on Macromolecules (C.E.R.M.), University of Liege, B6 Sart-Tilman, 4000 Liège, Belgium
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Gabriel S, Dubruel P, Schacht E, Jonas AM, Gilbert B, Jérôme R, Jérôme C. Electrografting of Poly(ethylene glycol) Acrylate: A One-Step Strategy for the Synthesis of Protein-Repellent Surfaces. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200500639] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Wirsén A, Sun H, Emilsson L, Albertsson AC. Solvent Free Vapor Phase Photografting of Maleic Anhydride onto Poly(ethylene terephthalate) and Surface Coupling of Fluorinated Probes, PEG, and an RGD-Peptide. Biomacromolecules 2005; 6:2281-9. [PMID: 16004473 DOI: 10.1021/bm050170+] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Poly(ethylene terephthalate) (PET) was photografted in a solvent free vapor of maleic anhydride and benzophenone. After hydrolysis of the initially grafted succinic anhydride groups, the carboxylic PET surfaces were modified by coupling reactions in organic and aqueous solutions. 2,2,2-Trifluoroethylamine and diamino PEGs of molecular weight 3400 and 2000 were reacted with acid chloride groups obtained by treating the PET-COOH surface with PCl(5). Furthermore, fluoro substituted thiols and a cystein terminated RGD containing peptide were bound to PET-COOH surfaces via a disulfide link by a three step coupling sequence. Coupling yields and surface concentrations of the fluoro substituted ligands were calculated from ESCA data. The RGD-peptide surfaces were evaluated by cultivation with rat smooth muscle cells.
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Affiliation(s)
- A Wirsén
- Department of Fibre and Polymer Technology, The Royal Institute of Technology, SE-100 44 Stockholm, Sweden
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Chen H, Zhang Z, Chen Y, Brook MA, Sheardown H. Protein repellant silicone surfaces by covalent immobilization of poly(ethylene oxide). Biomaterials 2005; 26:2391-9. [PMID: 15585242 DOI: 10.1016/j.biomaterials.2004.07.068] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2004] [Accepted: 07/26/2004] [Indexed: 11/29/2022]
Abstract
Polydimethylsiloxane elastomers were surface modified with passivating polyethylene oxide (PEO) polymers of different molecular weights, both monofunctional and bifunctional. Following the introduction of Si-H groups on the surfaces by acid-catalyzed equilibration in the presence of polymethylhydrosiloxane, the PEO was linked by platinum-catalyzed hydrosilylation. ATR-FTIR, X-ray photoelectron spectroscopy (XPS) and water contact angle results confirmed that the PEO was successfully grafted to the silicone rubber. Atomic force microscopy and XPS suggested that surface coverage with PEO was very high on the modified surfaces but not complete. The protein-resistant properties of the PEO-modified surfaces were demonstrated by measuring the adsorption of fibrinogen from both buffer and plasma. Fibrinogen adsorption from buffer to the PEO-modified surfaces was reduced by more than 90% compared with controls.
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Affiliation(s)
- Hong Chen
- Department of Chemical Engineering, McMaster University, 1280 Main St., West Hamilton, Ont., Canada L8S 4L7
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26
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Brena B, Zhuang GV, Augustsson A, Liu G, Nordgren J, Guo JH, Ross PN, Luo Y. Conformation Dependence of Electronic Structures of Poly(ethylene oxide). J Phys Chem B 2005; 109:7907-14. [PMID: 16851922 DOI: 10.1021/jp045685u] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The electronic structure of pure poly(ethylene oxide) (PEO) for four different polymeric chain conformations has been studied by Hartree-Fock (HF) and density functional theory (DFT) through the analysis of their valence band photoelectron spectroscopy (VB-PES), X-ray emission spectroscopy (XES), and resonant inelastic X-ray scattering (RIXS). It is shown that the valence band of PEO presents specific conformation dependence, which can be used as a fingerprint of the polymeric structures. The calculated spectra have been compared with experimental results for PEO powder.
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Affiliation(s)
- B Brena
- Theoretical Chemistry, Royal Institute of Technology, SE-10691, Stockholm, Sweden
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Abstract
Monofunctional poly(ethylene oxide) polymers of molecular weight (MW) 350, 750, and 2000, respectively, were modified with Si(OEt)3 groups. These polymers underwent classic condensation cure with hydroxy-terminated silicone polymers and Si(OEt)4 to give composites with poly(ethylene oxide) (PEO) rich surfaces under aqueous conditions, as shown by contact angle and XPS data. The hydrophobicity of the surfaces was considerably higher in air. The greatest PEO concentration was observed with relatively short chain polymers of MW 350. Silicone polymers bearing short chain PEO chains were also observed to be the most protein rejecting from either buffer (fibrinogen) (90%) or plasma (85%). The silicone/TES-MPEO formulation offers the advantage of a one step/one shot polymerization process that gives materials with a high protein rejection ability than can be cast as films, or molded into complex shapes. Covalently linked PEO films of a variety of chain lengths and total surface coverage can be readily accommodated.
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Affiliation(s)
- Hong Chen
- Department of Chemistry, McMaster University, Hamilton, ON, Canada L8S 4L7
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Vanderah DJ, Parr T, Silin V, Meuse CW, Gates RS, La H, Valincius G. Isostructural self-assembled monolayers. 2. Methyl 1-(3-mercaptopropyl)-oligo(ethylene oxide)s. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:1311-6. [PMID: 15803712 DOI: 10.1021/la035829g] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The structural order and ordering conditions of the self-assembled monolayers (SAMs) of HSCH2CH2CH2O(EO)xCH3, where EO = CH2CH2O and x = 3-9, on polycrystalline gold (Au) were determined by reflection-absorption infrared spectroscopy (RAIRS), spectroscopic ellipsometry (SE), and electrochemical impedance spectroscopy. For x = 5-7, RAIRS and SE data show that the oligo(ethylene oxide) [OEO] segments adopt the near single phase, 7/2 helical conformation of the folded-chain crystal polymorph of crystalline poly(ethylene oxide), oriented normal to the substrate. These SAMs exhibit OEO segment structure and orientation identical to that found in a previous isostructural series [HS(CH2CH2O)6-8C18H37 SAMs. Vanderah, D. J., et al. Langmuir 2003, 19, 3752] and are anisotropic films for surface science metrology where structure is constant and thickness increases in 0.30 nm increments. In addition, this is the first example of OEO SAMs to attain this highly ordered, helical conformation where the (EO)x segment is separated from the Au-sulfur headgroup by a polymethylene chain. For x = 4, 8, and 9, the SAMs are largely helical but show evidence of nonhelical conformations and establish the upper and lower limits of the isostructural set. For x = 3, the SAMs are largely disordered containing some all-trans conformation. SAM order as a function of immersion time from 100% water and 95% ethanol indicates that the HSCH2CH2CH2O(EO)5-7CH3 SAMs order faster and under a wider range of conditions than omega-alkyl 1-thiaolio(ethylene oxide) [HS(EO)xCH3] SAMs, reported earlier (Vanderah, D. J., et al. Langmuir 2002, 18, 4674 and Vanderah, D. J., et al. Langmuir 2003, 19, 2612).
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Affiliation(s)
- David J Vanderah
- Biotechnology Division, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8313, USA.
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Abstract
Since the discovery of carbon nanotubes by lijima in 1991, various carbon nanotubes with either a single- or multilayered graphene cylinder(s) have been produced, along with their noncarbon counterparts (for example, inorganic and polymer nanotubes). These nanostructured materials often possess size-dependent properties and show new phenomena related to the nanosize confinement of the charge carriers inside, which leads to the possibility of developing new materials with useful properties and advanced devices with desirable features for a wide range of applications. In particular, carbon nanotubes have been shown to exhibit superior properties attractive for various potential applications, ranging from their use as novel electron emitters in flat-panel displays to electrodes in electrochemical sensors. For many of the applications, it is highly desirable to have aligned/patterned forms of carbon nanotubes so that their structure/property can be easily assessed and so that they can be effectively incorporated into devices. In this Review, we present an overview on the development of aligned and micropatterned nanotubes, with an emphasis on carbon nanotubes.
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Affiliation(s)
- Liming Dai
- Department of Polymer Engineering, College of Polymer Science and Polymer Engineering, University of Akron, Akron, OH44325-0301, USA.
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Affiliation(s)
- Xueyan Zhang
- Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801
| | - Steve Granick
- Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801
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Dai L. Radiation chemistry for microfabrication of conjugated polymers and carbon nanotubes. Radiat Phys Chem Oxf Engl 1993 2001. [DOI: 10.1016/s0969-806x(01)00422-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Chen Q, Dai L, Gao M, Huang S, Mau A. Plasma Activation of Carbon Nanotubes for Chemical Modification. J Phys Chem B 2000. [DOI: 10.1021/jp003385g] [Citation(s) in RCA: 231] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Qidao Chen
- CSIRO Molecular Science, Bag 10, Clayton South, Victoria 3169, Australia
| | - Liming Dai
- CSIRO Molecular Science, Bag 10, Clayton South, Victoria 3169, Australia
| | - Mei Gao
- CSIRO Molecular Science, Bag 10, Clayton South, Victoria 3169, Australia
| | - Shaoming Huang
- CSIRO Molecular Science, Bag 10, Clayton South, Victoria 3169, Australia
| | - Albert Mau
- CSIRO Molecular Science, Bag 10, Clayton South, Victoria 3169, Australia
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