201
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Razin AA, Yari H, Ramezanzadeh B. Stone-chipping and adhesion deterioration of automotive coating systems caused by outdoor weathering of underneath layers. J IND ENG CHEM 2015. [DOI: 10.1016/j.jiec.2015.07.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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202
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Ni H, Liu J, Yang S. Preparation and characterization of inherently heat-sealable polyimides with high glass transition temperatures. J Appl Polym Sci 2015. [DOI: 10.1002/app.43058] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Hongjiang Ni
- Laboratory of Advanced Polymer Materials; Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 China
| | - Jingang Liu
- Laboratory of Advanced Polymer Materials; Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 China
| | - Shiyong Yang
- Laboratory of Advanced Polymer Materials; Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 China
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203
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Sharma V, Blackwood KA, Haddow D, Hook L, Mason C, Dye JF, García-Gareta E. Method for estimating protein binding capacity of polymeric systems. BIOCHIMIE OPEN 2015; 1:40-50. [PMID: 29632828 PMCID: PMC5889478 DOI: 10.1016/j.biopen.2015.10.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 10/14/2015] [Indexed: 11/15/2022]
Abstract
Composite biomaterials made from synthetic and protein-based polymers are extensively researched in tissue engineering. To successfully fabricate a protein-polymer composite, it is critical to understand how strongly the protein binds to the synthetic polymer, which occurs through protein adsorption. Currently, there is no cost-effective and simple method for characterizing this interfacial binding. To characterize this interfacial binding, we introduce a simple three-step method that involves: 1) synthetic polymer surface characterisation, 2) a quick, inexpensive and robust novel immuno-based assay that uses protein extraction compounds to characterize protein binding strength followed by 3) an in vitro 2D model of cell culture to confirm the results of the immuno-based assay. Fibrinogen, precursor of fibrin, was adsorbed (test protein) on three different polymeric surfaces: silicone, poly(acrylic acid)-coated silicone and poly(allylamine)-coated silicone. Polystyrene surface was used as a reference. Characterisation of the different surfaces revealed different chemistry and roughness. The novel immuno-based assay showed significantly stronger binding of fibrinogen to both poly(acrylic acid) and poly(allylamine) coated silicone. Finally, cell studies showed that the strength of the interaction between the protein and the polymer had an effect on cell growth. This novel immuno-based assay is a valuable tool in developing composite biomaterials of synthetic and protein-based polymers with the potential to be applied in other fields of research where protein adsorption onto surfaces plays an important role.
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Affiliation(s)
- Vaibhav Sharma
- RAFT Institute of Plastic Surgery, Mount Vernon Hospital, Northwood, HA6 2RN, UK.,Advanced Centre for Biochemical Engineering, University College London, Gower Street, London, WC1E 6BT, UK
| | - Keith A Blackwood
- RAFT Institute of Plastic Surgery, Mount Vernon Hospital, Northwood, HA6 2RN, UK.,Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, QLD 4059, Australia
| | - David Haddow
- Altrika Ltd., The Innovation Centre, 217 Portobello, Sheffield, S1 4DP, UK
| | - Lilian Hook
- RAFT Institute of Plastic Surgery, Mount Vernon Hospital, Northwood, HA6 2RN, UK
| | - Chris Mason
- Advanced Centre for Biochemical Engineering, University College London, Gower Street, London, WC1E 6BT, UK
| | - Julian F Dye
- RAFT Institute of Plastic Surgery, Mount Vernon Hospital, Northwood, HA6 2RN, UK
| | - Elena García-Gareta
- RAFT Institute of Plastic Surgery, Mount Vernon Hospital, Northwood, HA6 2RN, UK
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204
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Xie Q, Ma C, Liu C, Ma J, Zhang G. Poly(dimethylsiloxane)-Based Polyurethane with Chemically Attached Antifoulants for Durable Marine Antibiofouling. ACS APPLIED MATERIALS & INTERFACES 2015; 7:21030-21037. [PMID: 26349805 DOI: 10.1021/acsami.5b07325] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Marine biofouling is a problem for marine industry and maritime activities. We have prepared polyurethane with poly(dimethylsiloxane) (PDMS) main chains and N-(2,4,6-trichlorophenyl) maleimide (TCM) pendant groups via a combination of a thiol-ene click reaction and a condensation reaction and studied its properties. The polymer has low surface energy and a high water contact angle. When TCM content in bulk is high enough, sufficient antifoulant groups can be exposed on the surface. Our study reveals that such polymeric surface can effectively inhibit the adhesion and colonization of marine organisms such as bacteria (Micrococcus luteus), diatom Navicula, and barnacle cyprids. Particularly, marine field tests demonstrate that the polymer has excellent antibiofouling performance in 110 days.
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Affiliation(s)
- Qingyi Xie
- Faculty of Materials Science and Engineering, South China University of Technology , Guangzhou 510640, P. R. China
| | - Chunfeng Ma
- Faculty of Materials Science and Engineering, South China University of Technology , Guangzhou 510640, P. R. China
| | - Chao Liu
- Faculty of Materials Science and Engineering, South China University of Technology , Guangzhou 510640, P. R. China
| | - Jielin Ma
- Faculty of Materials Science and Engineering, South China University of Technology , Guangzhou 510640, P. R. China
| | - Guangzhao Zhang
- Faculty of Materials Science and Engineering, South China University of Technology , Guangzhou 510640, P. R. China
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China , Hefei 230026, P. R. China
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205
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Simaite A, Tondu B, Souères P, Bergaud C. Hybrid PVDF/PVDF-graft-PEGMA Membranes for Improved Interface Strength and Lifetime of PEDOT:PSS/PVDF/Ionic Liquid Actuators. ACS APPLIED MATERIALS & INTERFACES 2015; 7:19966-19977. [PMID: 26289948 DOI: 10.1021/acsami.5b04578] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
UNLABELLED The exploitation of soft conducting polymer-based actuators suffers from two main shortcomings: their short life cycle and the reproducibility of the fabrication techniques. The short life cycle usually results from the delamination of the components due to stresses at the interface during the actuation. In this work, to achieve strong adhesion to poly(3,4- ethylenedioxythiophene) poly(styrenesulfonate) ( PEDOT PSS) electrodes, the wetting properties of the surface of a polyvinylidene fluoride (PVDF) membrane are improved using argon-plasma-induced surface polymerization of poly(ethylene glycol) monomethyl ether methacrylate (PEGMA). Hybrid membranes are created with hydrophilic PVDF-graft-PEGMA outer surfaces and hydrophobic bulk. The width of each layer is controlled by spray coating, as it allows for the deposition of the reaction precursor to a certain depth. Subsequently, a PEDOT PSS water solution fills the pores of the functionalized part of the membrane and a mixing layer between PEDOT PSS and PVDF is created. We also show that PVDF-graft-PEGMA copolymers play an important role in binding the membrane to the electrodes and that direct mechanical interlocking in the pores can further improve the adhesion. Finally, PEDOT PSS/PVDF-graft-PEGMA/PEDOT:PSS actuators are made by simple solution casting. They are capable of producing high strains of 0.6% and show no signs of delamination after more than 150 h or 10(4) actuation cycles. Furthermore, the preservation of the hydrophobic membrane in between two PEDOT PSS layers increases the resistance between them from 0.36 Ω to 0.16 MΩ, thus drastically modifying the power dissipation of the actuators.
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Affiliation(s)
- Aiva Simaite
- CNRS, Laboratoire d'Analyse et d'Architecture des Systèmes (LAAS), 7 avenue du Colonel Roche, F-31031, Toulouse, France
- Université de Toulouse , Institut National des Sciences Appliquées (INSA), Laboratoire d'Analyse et d'Architecture des Systèmes (LAAS), F-31400, Toulouse, France
| | - Bertrand Tondu
- CNRS, Laboratoire d'Analyse et d'Architecture des Systèmes (LAAS), 7 avenue du Colonel Roche, F-31031, Toulouse, France
- Université de Toulouse , Institut National des Sciences Appliquées (INSA), Laboratoire d'Analyse et d'Architecture des Systèmes (LAAS), F-31400, Toulouse, France
| | - Philippe Souères
- CNRS, Laboratoire d'Analyse et d'Architecture des Systèmes (LAAS), 7 avenue du Colonel Roche, F-31031, Toulouse, France
- Université de Toulouse , Laboratoire d'Analyse et d'Architecture des Systèmes (LAAS), F-31400, Toulouse, France
| | - Christian Bergaud
- CNRS, Laboratoire d'Analyse et d'Architecture des Systèmes (LAAS), 7 avenue du Colonel Roche, F-31031, Toulouse, France
- Université de Toulouse , Laboratoire d'Analyse et d'Architecture des Systèmes (LAAS), F-31400, Toulouse, France
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206
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Kim H, Mohapatra H, Phillips ST. Rapid, On-Command Debonding of Stimuli-Responsive Cross-Linked Adhesives by Continuous, Sequential Quinone Methide Elimination Reactions. Angew Chem Int Ed Engl 2015; 54:13063-7. [PMID: 26347345 DOI: 10.1002/anie.201506511] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 08/07/2015] [Indexed: 01/14/2023]
Abstract
Adhesives that selectively debond from a surface by stimuli-induced head-to-tail continuous depolymerization of poly(benzyl ether) macro-cross-linkers within a poly(norbornene) matrix are described. Continuous head-to-tail depolymerization provides faster rates of response than can be achieved using a small-molecule cross-linker, as well as responses to lower stimulus concentrations. Shear-stress values for glass held together by the adhesive reach 0.51±0.10 MPa, whereas signal-induced depolymerization via quinone methide intermediates reduces the shear stress values to 0.05±0.02 MPa. Changing the length of the macro-cross-linkers alters the time required for debonding, and thus enables the programmed sequential release of specific layers in a glass composite material.
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Affiliation(s)
- Hyungwoo Kim
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802 (USA) http://www.psu.edu/dept/phillipsgroup/index.html
| | - Hemakesh Mohapatra
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802 (USA) http://www.psu.edu/dept/phillipsgroup/index.html
| | - Scott T Phillips
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802 (USA) http://www.psu.edu/dept/phillipsgroup/index.html.
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207
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Kim H, Mohapatra H, Phillips ST. Rapid, On-Command Debonding of Stimuli-Responsive Cross-Linked Adhesives by Continuous, Sequential Quinone Methide Elimination Reactions. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201506511] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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208
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Füllbrandt M, Kesal D, von Klitzing R. Multiscaling Approach for Non-Destructive Adhesion Studies of Metal/Polymer Composites. ACS APPLIED MATERIALS & INTERFACES 2015; 7:16247-16256. [PMID: 26156573 DOI: 10.1021/acsami.5b01949] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The adhesion of polyamide 6 (PA6) and polyethylene (PE) toward an aluminum alloy (Al-A) and a dual phase steel (DPS) is studied by contact angle (CA) measurements and atomic force microscopy (AFM). With the combination of the two methods the adhesion properties on a macro- and (sub)microscopic scale can be determined in a nondestructive way. The work of adhesion per area (Wad) of the studied metal/polymer hybrids qualitatively scales the same on both length scales, that is, Al-A/PA6 > DPS/PA6 > Al-A/PE, DPS/PE. The polymer dominates the adhesion. The lower adhesion for PE toward the metal surfaces is explained by dominating van der Waals attraction forces, whereas adhesion for PA6 can also be attributed to attractive polar forces such as hydrogen bonding. For metal/PA6, Wad on a macro- and microscopic length scale is similar. For metal/PE, a discrepancy is measured with lower adhesion values on the microscopic scale than on the macroscopic scale.
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Affiliation(s)
- Marieke Füllbrandt
- Technische Universität Berlin, Stranski-Laboratorium, Str. des 17.Juni 124, 10623 Berlin, Germany
| | - Dikran Kesal
- Technische Universität Berlin, Stranski-Laboratorium, Str. des 17.Juni 124, 10623 Berlin, Germany
| | - Regine von Klitzing
- Technische Universität Berlin, Stranski-Laboratorium, Str. des 17.Juni 124, 10623 Berlin, Germany
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209
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Myers JN, Chen Z. Surface plasma treatment effects on the molecular structure at polyimide/air and buried polyimide/epoxy interfaces. CHINESE CHEM LETT 2015. [DOI: 10.1016/j.cclet.2015.01.016] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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210
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Awaja F, Carletti E, Bonani W, Speranza G. Vinculin focal adhesion of osteoblast-like cells on PEEK coated with ultra-thin polymer nano films. J Appl Polym Sci 2015. [DOI: 10.1002/app.42181] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Firas Awaja
- Center for Materials and Microsystems; PAM-SE, Fondazione Bruno Kessler; Via Sommarive 18 Trento Italy
| | - Eleonora Carletti
- Department of Industrial Engineering; BIOtech Research Center and INSTM Research Unit, University of Trento; Via Sommarive 9 Trento Italy
| | - Walter Bonani
- Department of Industrial Engineering; BIOtech Research Center and INSTM Research Unit, University of Trento; Via Sommarive 9 Trento Italy
| | - Giorgio Speranza
- Center for Materials and Microsystems; PAM-SE, Fondazione Bruno Kessler; Via Sommarive 18 Trento Italy
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211
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Myers JN, Zhang X, Bielefeld J, Lin Q, Chen Z. Nondestructive in Situ Characterization of Molecular Structures at the Surface and Buried Interface of Silicon-Supported Low-k Dielectric Films. J Phys Chem B 2015; 119:1736-46. [DOI: 10.1021/jp510205u] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- John N. Myers
- Department
of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Xiaoxian Zhang
- Department
of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Jeff Bielefeld
- Intel Corporation, Hillsboro, Oregon 97124, United States
| | - Qinghuang Lin
- IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, United States
| | - Zhan Chen
- Department
of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
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212
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Ulrich NW, Myers JN, Chen Z. Characterization of polymer/epoxy buried interfaces with silane adhesion promoters before and after hygrothermal aging for the elucidation of molecular level details relevant to adhesion. RSC Adv 2015. [DOI: 10.1039/c5ra24332g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Buried interfacial structures containing epoxy underfills are incredibly important in the microelectronics industry and their structures determine the interfacial adhesion properties and ultimately their lifetime.
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Affiliation(s)
| | - John N. Myers
- Department of Chemistry
- University of Michigan
- Ann Arbor
- USA
| | - Zhan Chen
- Department of Chemistry
- University of Michigan
- Ann Arbor
- USA
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213
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214
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Adachi N, Itagaki R, Sugeno M, Norioka T. Dispersion of Fullerene in Neat Synthesized Liquid-state Oligo(p-phenyleneethynylene)s. CHEM LETT 2014. [DOI: 10.1246/cl.140587] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Naoya Adachi
- Division of Liberal Arts, School of Science and Engineering, Tokyo Denki University
| | - Ryo Itagaki
- Division of Science, School of Science and Engineering, Tokyo Denki University
| | - Masafumi Sugeno
- Division of Science, School of Science and Engineering, Tokyo Denki University
| | - Takayuki Norioka
- Division of Science, School of Science and Engineering, Tokyo Denki University
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215
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Iqbal D, Rechmann J, Sarfraz A, Altin A, Genchev G, Erbe A. Synthesis of ultrathin poly(methyl methacrylate) model coatings bound via organosilanes to zinc and investigation of their delamination kinetics. ACS APPLIED MATERIALS & INTERFACES 2014; 6:18112-18121. [PMID: 25232896 DOI: 10.1021/am504992r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Polymer coatings are widely used to protect metals from corrosion. Coating adhesion to the base material is critical for good protection, but coatings may fail because of cathodic delamination. Most of the experimental studies on cathodic delamination use polymers to study the corrosion behavior under conditions where the interfacial chemistry at the metal(oxide)/polymer interface is not well-defined. Here, ultrathin linear and cross-linked poly(methyl methacrylate) [PMMA] coatings that are covalently bound to oxide-covered zinc via a silane linker have been prepared. For preparation, zinc was functionalized with vinyltrimethoxysilane (VTS), yielding a vinyl monomer-covered surface. These samples were subjected to thermally initiated free radical polymerization in the presence of methyl methacrylate (MMA) to yield surface-bound ultrathin PMMA films of 10-20 nm thickness, bound to the surface via Zn-O-Si bonds. A similar preparation was also carried out in the presence of different amounts of the cross-linkers ethylene glycol diacrylate and hexanediol diacrylate. Functionalized and polymer-coated zinc samples were characterized by infrared (IR) spectroscopy, secondary ion mass spectrometry (SIMS), ellipsometry, and X-ray photoelectron spectroscopy (XPS). Coating stability toward cathodic delamination has been evaluated by scanning Kelvin probe (SKP) experiments. In all cases, the covalently linked coatings show lower delamination rates of 0.02-0.2 mm h(-1) than coatings attached to the surface without covalent bonds (rates ∼10 mm h(-1)). Samples with a higher fraction of cross-linker delaminate slower, with rates down to 0.03-0.04 mm h(-1), compared to ∼0.3 mm h(-1) without cross-linker. Samples with longer hydrophobic alkyl chains also delaminate slower, with the lowest observed delamination rate of 0.028 mm h(-1) using hexanediol diacrylate. For the coatings studied here, delamination kinetics is not diffusion limited, but the rate is controlled by a chemical reaction. Several possibilities for the nature of this reaction are discussed; radical side reactions of the oxygen reduction are the most likely path of deadhesion.
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Affiliation(s)
- Danish Iqbal
- Max-Planck-Institut für Eisenforschung GmbH , Department of Interface Chemistry and Surface Engineering, Max-Planck-Str. 1, 40237 Düsseldorf, Germany
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216
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Cho Y, Vu BQ, Bedair TM, Park BJ, Joung YK, Han DK. Crack prevention of biodegradable polymer coating on metal facilitated by a nano-coupled interlayer. J BIOACT COMPAT POL 2014. [DOI: 10.1177/0883911514547094] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Crack prevention of biodegradable polymer coatings on drug-eluting stents was investigated by introducing a nano-coupled layer at the interface between the metal surface and the polymer coating layer using surface-initiated ring-opening polymerization of ε-caprolactone. Poly(d,l-lactide-co-glycolide) coating on cobalt-chromium control and ricinoleic acid-poly(caprolactone)–grafted cobalt-chromium was carried out using electrospraying. The cracking of the biodegradable polymer coating on drug-eluting stents during ballooning was addressed by introducing a nano-coupled interlayer on the cobalt-chromium surface. The ricinoleic acid-poly(caprolactone) nano-coupled interlayer and poly(d,l-lactide-co-glycolide)-coated top layer were characterized using attenuated total reflection Fourier transform infrared, contact angle, ellipsometry, X-ray photoelectron spectroscopy, and atomic force microscopy. Based on scratch tests, the nano-coupled samples had stronger interfacial adhesion compared to the control sample without the nano-coupled layer. Scanning electron microscope images indicated that the cracking on the poly(d,l-lactide-co-glycolide) coating was addressed. Introducing a nano-coupling interlayer may be an important strategy to preventing polymer coating cracking on drug-eluting stents.
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Affiliation(s)
- Youngjin Cho
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Bach Quang Vu
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Tarek M Bedair
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea
- Department of Biomedical Engineering, Korea University of Science and Technology, Daejeon, Republic of Korea
| | - Bang Ju Park
- Department of Electronic Engineering and Institute of Gachon Fusion Technology, Gachon University, Seongnam, Republic of Korea
| | - Yoon Ki Joung
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea
- Department of Biomedical Engineering, Korea University of Science and Technology, Daejeon, Republic of Korea
| | - Dong Keun Han
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea
- Department of Biomedical Engineering, Korea University of Science and Technology, Daejeon, Republic of Korea
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217
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Jin X, Heepe L, Strueben J, Adelung R, Gorb SN, Staubitz A. Challenges and Solutions for Joining Polymer Materials. Macromol Rapid Commun 2014; 35:1551-70. [DOI: 10.1002/marc.201400200] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Revised: 05/18/2014] [Indexed: 12/13/2022]
Affiliation(s)
- Xin Jin
- Institute for Materials Science; Faculty of Engineering; University of Kiel; Kaiserstr. 2 24143 Kiel Germany
| | - Lars Heepe
- Zoological Institute: Functional Morphology and Biomechanics; University of Kiel; Am Botanischen Garten 1-9 24098 Kiel Germany
| | - Jan Strueben
- Otto-Diels-Institute for Organic Chemistry; University of Kiel; Otto-Hahn-Platz 4 24098 Kiel Germany
| | - Rainer Adelung
- Institute for Materials Science; Faculty of Engineering; University of Kiel; Kaiserstr. 2 24143 Kiel Germany
| | - Stanislav N. Gorb
- Zoological Institute: Functional Morphology and Biomechanics; University of Kiel; Am Botanischen Garten 1-9 24098 Kiel Germany
| | - Anne Staubitz
- Otto-Diels-Institute for Organic Chemistry; University of Kiel; Otto-Hahn-Platz 4 24098 Kiel Germany
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218
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Santos DJD, Batalha GF. Failure criterion for adhesively bonded joints using Arcan´s experimental method. POLIMEROS 2014. [DOI: 10.1590/0104-1428.1485] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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219
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Bedair TM, Cho Y, Kim TJ, Kim YD, Park BJ, Joung YK, Han DK. Reinforcement of interfacial adhesion of a coated polymer layer on a cobalt-chromium surface for drug-eluting stents. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:8020-8028. [PMID: 24955485 DOI: 10.1021/la501990p] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
During the balloon expansion of several commercially available drug-eluting stents, various types of defects in the polymer layer have been observed. The aim of this study is to prevent these defects by increasing the interfacial adhesion between the metal substrate and the drug-in-polymer matrix using poly(caprolactone) (PCL) brushes onto a cobalt-chromium (Co-Cr or CC) alloy surface. The chemical modification of the Co-Cr surface was accomplished by grafting ricinoleic acid (RA) onto the metal substrate followed by surface-initiated ring opening polymerization of ε-caprolactone. The unmodified, RA-grafted (CC-RA), and PCL-grafted Co-Cr substrates (CC-RA-PCL3D and CC-RA-PCL6D) were characterized by various surface analyses. Poly(d,l-lactide) containing sirolimus was spray coated onto the unmodified and modified substrates. The adhesion property of the polymer coating on the PCL-grafted surfaces was improved compared to those of other samples. Among all of the drug-in-polymer coated samples, both CC-RA-PCL3D and CC-RA-PCL6D exhibited a stabilized drug release profile over 49 days. It was also revealed that CC-RA-PCL6D showed the slowest drug release of all the samples. On the basis of these results, the proposed nanocoupling method has shown not only improved adhesion of the drug-in-polymer matrix to the Co-Cr substrate but also controlled drug release.
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Affiliation(s)
- Tarek M Bedair
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology , Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
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220
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Gao J, Shen Y, Zhang J, Xu H. Submerged friction stir weld of polyethylene sheets. J Appl Polym Sci 2014. [DOI: 10.1002/app.41059] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jicheng Gao
- College of Material Science and Technology; Nanjing University of Aeronautics and Astronautics; Nanjing People's Republic of China
| | - Yifu Shen
- College of Material Science and Technology; Nanjing University of Aeronautics and Astronautics; Nanjing People's Republic of China
| | - Jingqing Zhang
- College of Material Science and Technology; Nanjing University of Aeronautics and Astronautics; Nanjing People's Republic of China
| | - Haisheng Xu
- College of Material Science and Technology; Nanjing University of Aeronautics and Astronautics; Nanjing People's Republic of China
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221
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A novel UV-curable epoxy acrylate resin containing arylene ether sulfone linkages: Preparation, characterization, and properties. J Appl Polym Sci 2014. [DOI: 10.1002/app.41067] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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222
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Affiliation(s)
- Colin A. Scholes
- Cooperative
Research Centre for Greenhouse Gas Technologies (CO2CRC), Department
of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Julius Motuzas
- FIMLab
− Films and Inorganic Membrane Laboratory, School of Chemical
Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Simon Smart
- FIMLab
− Films and Inorganic Membrane Laboratory, School of Chemical
Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Sandra E. Kentish
- Cooperative
Research Centre for Greenhouse Gas Technologies (CO2CRC), Department
of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Victoria 3010, Australia
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223
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Rezaei Kolahchi A, Carreau PJ, Ajji A. Surface roughening of PET films through blend phase coarsening. ACS APPLIED MATERIALS & INTERFACES 2014; 6:6415-6424. [PMID: 24758422 DOI: 10.1021/am4058259] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this study, a novel method to increase the surface roughness of polyethylene terephthalate (PET) films is proposed. The mechanism of phase coarsening at the surface in extruded thin films of PET blended with low concentrations of polystyrene (PS) was investigated. A small amount of poly(hyroxyl ether) of bisphenol A (phenoxy resin, PKHH) was found to significantly increase the surface roughness due to its effect on the PS-PET interfacial tension. X-ray photoelectron spectroscopy (XPS) results indicated that in the presence of PKHH, PS droplets migrated spontaneously towards the surface of the polymer film. An increased local concentration of PS near the surface took the form of encapsulated droplets. Above the flow temperature of the blend, the local concentration of PS eventually reached a level where a co-continuous morphology occurred, resulting in the instabilities on the surface of the film. The adhesion properties of films with various roughnesses were determined using a pull-off test and found to be significantly increased, which suggested that co-continuous morphology and the coarsening process increased the adhesive properties of the film.
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Affiliation(s)
- Ahmad Rezaei Kolahchi
- CREPEC, Chemical Engineering Department, Polytechnique Montreal , Montreal, Quebec, Canada
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224
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Hegazy MA, El-Hamouly SH, Azab MM, Beshir SI, Zayed MA. Homo- and copolymerization of N-(2-thiazolyl)methacrylamide with different vinyl monomers: Synthesis, characterization, determination of monomer reactivity ratios and biological activity. POLYMER SCIENCE SERIES B 2014. [DOI: 10.1134/s1560090414020067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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225
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Myers JN, Zhang C, Lee KW, Williamson J, Chen Z. Hygrothermal aging effects on buried molecular structures at epoxy interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:165-171. [PMID: 24345068 DOI: 10.1021/la4037869] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Interfacial properties such as adhesion are determined by interfacial molecular structures. Adhesive interfaces in microelectronic packages that include organic polymers such as epoxy are susceptible to delamination during accelerated stress testing. Infrared-visible sum frequency generation vibrational spectroscopy (SFG) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) were used to study molecular structures at buried epoxy interfaces during hygrothermal aging to relate molecular structural changes at buried interfaces to decreases in macroscopic adhesion strength. SFG peaks associated with strongly hydrogen bonded water were detected at hydrophilic epoxy interfaces. Ordered interfacial water was also correlated to large decreases in interfacial adhesion strength that occurred as a result of hygrothermal aging, which suggests that water diffused to the interface and replaced original hydrogen bond networks. No water peaks were observed at hydrophobic epoxy interfaces, which was correlated with a much smaller decrease in adhesion strength from the same aging process. ATR-FTIR water signals observed in the epoxy bulk were mainly contributed by relatively weakly hydrogen bonded water molecules, which suggests that the bulk and interfacial water structure was different. Changes in interfacial methyl structures were observed regardless of the interfacial hydrophobicity which could be due to water acting as a plasticizer that restructured both the bulk and interfacial molecular structure. This research demonstrates that SFG studies of molecular structural changes at buried epoxy interfaces during hygrothermal aging can contribute to the understanding of moisture-induced failure mechanisms in electronic packages that contain organic adhesives.
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Affiliation(s)
- John N Myers
- Department of Chemistry, University of Michigan , 930 North University Avenue, Ann Arbor, Michigan 48109, United States
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226
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The effects of low salt concentrations on the mechanism of adhesion between two pieces of pork semimembranosus muscle following tumbling and cooking. Meat Sci 2014; 96:5-13. [DOI: 10.1016/j.meatsci.2013.06.029] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 06/21/2013] [Accepted: 06/28/2013] [Indexed: 11/24/2022]
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227
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Glaris P, Coulon JF, Dorget M, Poncin-Epaillard F. Thermal annealing as a new simple method for PTFE texturing. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.08.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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228
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229
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Wear response and mechanical behaviour of silicone-based photoluminescent coatings. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.03.044] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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230
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231
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Vynckier AK, Dierickx L, Voorspoels J, Gonnissen Y, Remon JP, Vervaet C. Hot-melt co-extrusion: requirements, challenges and opportunities for pharmaceutical applications. J Pharm Pharmacol 2013; 66:167-79. [DOI: 10.1111/jphp.12091] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Accepted: 05/09/2013] [Indexed: 11/28/2022]
Abstract
Abstract
Objectives
Co-extrusion implies the simultaneous hot-melt extrusion of two or more materials through the same die, creating a multi-layered extrudate. It is an innovative continuous production technology that offers numerous advantages over traditional pharmaceutical processing techniques. This review provides an overview of the co-extrusion equipment, material requirements and medical and pharmaceutical applications.
Key findings
The co-extrusion equipment needed for pharmaceutical production has been summarized. Because the geometrical design of the die dictates the shape of the final product, different die types have been discussed. As one of the major challenges at the moment is shaping the final product in a continuous way, an overview of downstream solutions for processing co-extrudates into drug products is provided. Layer adhesion, extrusion temperature and viscosity matching are pointed out as most important requirements for material selection. Examples of medical and pharmaceutical applications are presented and some recent findings considering the production of oral drug delivery systems have been summarized.
Summary
Co-extrusion provides great potential for the continuous production of fixed-dose combination products which are gaining importance in pharmaceutical industry. There are still some barriers to the implementation of co-extrusion in the pharmaceutical industry. The optimization of downstream processing remains a point of attention.
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Affiliation(s)
- An-Katrien Vynckier
- Laboratory of Pharmaceutical Technology, Ghent University, Ghent, Belgium
- SEPS Pharma, Ghent, Belgium
| | - Lien Dierickx
- Laboratory of Pharmaceutical Technology, Ghent University, Ghent, Belgium
| | | | | | - Jean Paul Remon
- Laboratory of Pharmaceutical Technology, Ghent University, Ghent, Belgium
| | - Chris Vervaet
- Laboratory of Pharmaceutical Technology, Ghent University, Ghent, Belgium
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232
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Han GJ, Kim JH, Kim CK, Chung SN, Chun BH, Cho BH. Sequential deposition of hexamethyldisiloxane and benzene in non-thermal plasma adhesion to dental ceramic. Macromol Res 2013. [DOI: 10.1007/s13233-013-1145-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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233
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Kechek’yan AS, Mikhailik ES, Monakhova KZ, Kurkin TS, Gritsenko OT, Beshenko MA, Ozerin AN. Effect of preliminary compression and uniform shear on the deformation behavior of a filled polymer nanocomposite in orientation stretching. DOKLADY CHEMISTRY 2013. [DOI: 10.1134/s0012500813030087] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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234
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Kuttner C, Hanisch A, Schmalz H, Eder M, Schlaad H, Burgert I, Fery A. Influence of the polymeric interphase design on the interfacial properties of (fiber-reinforced) composites. ACS APPLIED MATERIALS & INTERFACES 2013; 5:2469-2478. [PMID: 23446425 DOI: 10.1021/am302694h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In fiber-reinforced composites, the interphase nanostructure (i.e., the extended region between two phases in contact) has a pronounced influence on their interfacial adhesion. This work aims at establishing a link between the interphase design of PS-based polymeric fiber coatings and their influence on the micromechanical performance of epoxy-based composite materials. Thiol-ene photochemistry was utilized to introduce a polymeric gradient on silica-like surfaces following a two-step approach without additional photoinitiator. Two complementary grafting-techniques were adapted to modify glass fibers: "Grafting-onto" deposition of PB-b-PS diblock copolymers for thin-film coatings (thickness<20 nm) at low grafting density (<0.1 chains/nm2)--and "grafting-from" polymerization for brush-like PS homopolymer coatings of higher thickness (up to 225 nm) and higher density. Polymer-coated glass fibers were characterized for polymer content using thermogravimetric analysis (TGA) and their nanostructural morphologies by scanning electron microscopy (SEM). Model substrates of flat glass and silicon were studied by atomic force microscopy (AFM) and spectroscopic ellipsometry (SE). The change in interfacial shear strength (IFSS) due to fiber modification was determined by a single fiber pull-out experiment. Thick coatings (>40 nm) resulted in a 50% decrease in IFSS. Higher shear strength occurred for thinner coatings of homopolymer and for lower grafting densities of copolymer. Increased IFSS (10%) was found upon dilution of the surface chain density by mixing copolymers. We show that the interfacial shear strength can be increased by tailoring of the interphase design, even for systems with inherently poor adhesion. Perspectives of polymeric fiber coatings for tailored matrix-fiber compatibility and interfacial adhesion are discussed.
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Affiliation(s)
- Christian Kuttner
- Department of Physical Chemistry II, University of Bayreuth, Bayreuth 95440, Germany
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235
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Pirozhnikov PB, Korolev IV, Mashlyakovskii LN, Kuzina NG. Influence of the chemical structure of fluorinated radicals in acrylated derivatives of Boltorn™ H20 hyperbranched polyesterpolyol on the surface energy of coatings prepared from UV-curable powder formulations. RUSS J APPL CHEM+ 2013. [DOI: 10.1134/s1070427213020171] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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236
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Poxson DJ, Mont FW, Cho J, Schubert EF, Siegel RW. Tailored nanoporous coatings fabricated on conformable polymer substrates. ACS APPLIED MATERIALS & INTERFACES 2012; 4:6295-6301. [PMID: 23116359 DOI: 10.1021/am301882m] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Nanoporous coatings have become the subject of intense investigation, in part because they have been shown to have unique and tailorable physical properties that can depart greatly from their dense or macroscopic counterparts. Nanoporous coatings are frequently fabricated utilizing oblique-angle or glancing-angle physical vapor-phase deposition techniques. However, a significant limitation for such coatings exists; they are almost always deposited on smooth and rigid planar substrates, such as silicon and glass. This limitation greatly constrains the applicability, tailorability, functionality and even the economic viability, of such nanoporous coatings. Here, we report our findings on nanoporous/polymer composite systems (NPCS) fabricated by utilizing oblique-angle electron-beam methodology. These unique composite systems exhibit several favorable characteristics, namely, (i) fine-tuned control over coating nanoporosity and thickness, (ii) excellent adhesion between the nanoporous coating and polymer substrate, (iii) the ability to withstand significant and repeated bending, and (iv) the ability to be molded conformably on two and three-dimensional surfaces while closely retaining the composite system's designed nanoporous film structure and, hence, properties.
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Affiliation(s)
- David J Poxson
- Rensselaer Nanotechnology Center, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180, USA.
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237
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Capelot M, Montarnal D, Tournilhac F, Leibler L. Metal-catalyzed transesterification for healing and assembling of thermosets. J Am Chem Soc 2012; 134:7664-7. [PMID: 22537278 DOI: 10.1021/ja302894k] [Citation(s) in RCA: 522] [Impact Index Per Article: 43.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Catalytic control of bond exchange reactions enables healing of cross-linked polymer materials under a wide range of conditions. The healing capability at high temperatures is demonstrated for epoxy-acid and epoxy-anhydride thermoset networks in the presence of transesterification catalysts. At lower temperatures, the exchange reactions are very sluggish, and the materials have properties of classical epoxy thermosets. Studies of model molecules confirmed that the healing kinetics is controlled by the transesterification reaction rate. The possibility of varying the catalyst concentration brings control and flexibility of welding and assembling of epoxy thermosets that do not exist for thermoplastics.
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Affiliation(s)
- Mathieu Capelot
- Matière Molle et Chimie (UMR 7167 ESPCI-CNRS), Ecole Supérieure de Physique et Chimie Industrielles de la Ville de Paris ESPCI ParisTech, 10 rue Vauquelin, 75005 Paris, France
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238
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Jamshidian M, Arab Tehrany E, Cleymand F, Leconte S, Falher T, Desobry S. Effects of synthetic phenolic antioxidants on physical, structural, mechanical and barrier properties of poly lactic acid film. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2011.09.089] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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239
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Choi J, Cho SB, Lee BS, Joung YK, Park K, Han DK. Improvement of interfacial adhesion of biodegradable polymers coated on metal surface by nanocoupling. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:14232-14239. [PMID: 22017569 DOI: 10.1021/la2030318] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A method of securing the adhesion of biodegradable polymer coating was investigated for drug-eluting metal stents, using surface-initiated ring-opening polymerization (SI-ROP) of L-lactide. Introduction of oligolactide on the stainless steel (SS) surface was successful and the thickness of the oligolactide grafts remained on the nanometer scale, as determined by ellipsometry. The presence of an oligolactide graft was also identified using attenuated total reflection-Fourier transform infrared (ATR-FTIR) and electron spectroscopy for chemical analysis (ESCA). On top of the grafts, poly(D,L-lactide-co-glycolide) (PLGA) coating was carried out on different substrates such as SS control, plasma-treated SS, and lactide-grafted (referred to as a nanocoupled) SS using electrospraying. When the adhesion forces were measured with a scratch tester, the nanocoupled SS showed the strongest interfacial adhesion between polymer coating layer and metal substrate. The outcome of the peel-off test was also consistent with the result of the scratch test. When degradation behavior of the polymer coating in vitro was examined for up to 4 weeks in a continuous fluid flow, the SEM images demonstrated that polymer degradation was obvious due to hydration and swelling of the polymer matrix. Although the matrix completely disappeared after 4 weeks for SS control and plasma-treated substrates, the nanocoupled SS was persistent with some polymer matrix. In addition, the release profiles of SRL-loaded PLGA coating appeared slightly different between control and nanocoupled groups. This work suggested that the concept of nanocoupling remarkably improved the interfacial adhesion stability between metal surface and polymer layer and controlled drug release, and showed the feasibility of drug-eluting stents.
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Affiliation(s)
- Jiyeon Choi
- Center for Biomaterials, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Korea
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240
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Wei W, Xia S, Liu G, Dong X, Jin W, Xu N. Effects of polydimethylsiloxane (PDMS) molecular weight on performance of PDMS/ceramic composite membranes. J Memb Sci 2011. [DOI: 10.1016/j.memsci.2011.03.059] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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241
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Chen RT, Muir BW, Thomsen L, Tadich A, Cowie BCC, Such GK, Postma A, McLean KM, Caruso F. New Insights into the Substrate–Plasma Polymer Interface. J Phys Chem B 2011; 115:6495-502. [DOI: 10.1021/jp200864k] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Rodney T. Chen
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
- CSIRO Materials Science and Engineering, Bayview Avenue, Clayton, Victoria 3168, Australia
| | - Benjamin W. Muir
- CSIRO Materials Science and Engineering, Bayview Avenue, Clayton, Victoria 3168, Australia
| | - Lars Thomsen
- Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - Anton Tadich
- Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - Bruce C. C. Cowie
- Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - Georgina K. Such
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Almar Postma
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
- CSIRO Materials Science and Engineering, Bayview Avenue, Clayton, Victoria 3168, Australia
| | - Keith M. McLean
- CSIRO Materials Science and Engineering, Bayview Avenue, Clayton, Victoria 3168, Australia
| | - Frank Caruso
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
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242
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243
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Zhang S, Awaja F, James N, McKenzie DR, Ruys AJ. Autohesion of plasma treated semi-crystalline PEEK: Comparative study of argon, nitrogen and oxygen treatments. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2010.11.013] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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244
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Walther F, Drobek T, Gigler AM, Hennemeyer M, Kaiser M, Herberg H, Shimitsu T, Morfill GE, Stark RW. Surface hydrophilization of SU-8 by plasma and wet chemical processes. SURF INTERFACE ANAL 2010. [DOI: 10.1002/sia.3515] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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245
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Glass P, Chung H, Washburn NR, Sitti M. Enhanced wet adhesion and shear of elastomeric micro-fiber arrays with mushroom tip geometry and a photopolymerized p(DMA-co-MEA) tip coating. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:17357-17362. [PMID: 20879746 DOI: 10.1021/la1029245] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Using principles inspired by the study of naturally occurring sticky systems such as the micro- and nanoscale fibers on the toes of geckos and the adhesive proteins secreted by marine animals such as mussels, this study describes the development and evaluation of a novel patterned and coated elastomeric microfibrillar material for enhanced repeatable adhesion and shear in wet environments. A multistep fabrication process consisting of optical lithography, micromolding, polymer synthesis, dipping, stamping, and photopolymerization is described to produce uniform arrays of polyurethane elastomeric microfibers with mushroom-shaped tips coated with a thin layer of lightly cross-linked p(DMA-co-MEA), an intrinsically adhesive synthetic polymer. Adhesion and shear force characterization of these arrays in contact with a glass hemisphere is demonstrated, and significant pull-off force, overall work of adhesion, and shear force enhancements in submerged aqueous environments are shown when compared to both unpatterned and uncoated samples, as well as previously evaluated patterned and coated arrays with differing geometry. Such materials may have potential value as repeatable adhesives for wet environments, such as for medical devices.
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Affiliation(s)
- Paul Glass
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
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246
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Zhang S, Awaja F, James N, McKenzie DR, Ruys AJ. A comparison of the strength of autohesion of plasma treated amorphous and semi-crystalline PEEK films. POLYM ADVAN TECHNOL 2010. [DOI: 10.1002/pat.1791] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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247
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Wohl CJ, Belcher MA, Chen L, Connell JW. Laser ablative patterning of copoly(imide siloxane)s generating superhydrophobic surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:11469-11478. [PMID: 20446721 DOI: 10.1021/la100958r] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Low surface energy copoly(imide siloxane)s were generated via condensation polymerization reactions. The generated materials were characterized spectroscopically, thermally, mechanically, and via contact angle goniometry. The decrease in tensile modulus and opaque appearance of copoly(imide siloxane) films indicated phase segregation in the bulk. Preferential surface partitioning of the siloxane moieties was verified by X-ray photoelectron spectroscopy (XPS) and increased advancing water contact angle values (theta(A)). Pristine copoly(imide siloxane) surfaces typically exhibited theta(A) values of 111 degrees and sliding angles from 27 degrees to >60 degrees. The surface properties of these copoly(imide siloxane) films were further altered using laser ablation patterning (frequency-tripled Nd:YAG laser, 355 nm). Laser-etched square pillar arrays (25 microm pillars with 25 microm interspaces) changed theta(A) by up to 64 degrees. Theta(A) values approaching 175 degrees and sliding angles from 1 degree to 15 degrees were observed. ATR-IR spectroscopy and XPS indicated polymer chain scission reactions occurred as a result of laser ablation. Initial particle adhesion studies revealed that the copoly(imide siloxane)s outperformed the corresponding homopolyimides and that laser ablation patterning further enhanced this result.
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248
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Farris S, Pozzoli S, Biagioni P, Duó L, Mancinelli S, Piergiovanni L. The fundamentals of flame treatment for the surface activation of polyolefin polymers – A review. POLYMER 2010. [DOI: 10.1016/j.polymer.2010.05.036] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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