1
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Gately TJ, Li W, Mostafavi SH, Bardeen CJ. Reversible Adhesion Switching Using Spiropyran Photoisomerization in a High Glass Transition Temperature Polymer. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01262] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas J. Gately
- Department of Chemistry, University of California, Riverside, Riverside, California 92521, United States
| | - Wangxiang Li
- Department of Chemistry, University of California, Riverside, Riverside, California 92521, United States
| | - Seyed Hossein Mostafavi
- Department of Bioengineering, University of California, Riverside, Riverside, California 92521, United States
| | - Christopher J. Bardeen
- Department of Chemistry, University of California, Riverside, Riverside, California 92521, United States
- Materials Science and Engineering Program, University of California, Riverside, Riverside, California 92521, United States
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2
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da Hora LF, Oliveira do Nascimento JH, Mendonça Fontes Galvão F, Nunes J. Polymer nanolatexes for dyeing of soybean fabric. NANO SELECT 2021. [DOI: 10.1002/nano.202100067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- Luiz Felipe da Hora
- Instituto de Química Universidade Federal do Rio Grande do Norte Campus Universitário, Lagoa Nova Natal RN 59078‐970 Brazil
| | | | | | - Juliana Nunes
- Instituto de Química Universidade Federal do Rio Grande do Norte Campus Universitário, Lagoa Nova Natal RN 59078‐970 Brazil
- CIDETEC Nanomedicine Fundación CIDETEC Paseo Miramón 196 Donostia‐San Sebastián 20014 Spain
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3
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Hiroshige S, Minato H, Nishizawa Y, Sasaki Y, Kureha T, Shibayama M, Uenishi K, Takata T, Suzuki D. Temperature-dependent relationship between the structure and mechanical strength of volatile organic compound-free latex films prepared from poly(butyl acrylate-co-methyl methacrylate) microspheres. Polym J 2020. [DOI: 10.1038/s41428-020-00406-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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4
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Alfhaid L, Williams NH, Geoghegan M. Adhesion between oppositely charged polyelectrolytes in salt solution. J Appl Polym Sci 2020. [DOI: 10.1002/app.49130] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Latifah Alfhaid
- Department of Physics and AstronomyUniversity of Sheffield Sheffield UK
- Department of Physics, College of ScienceUniversity of Ha'il Hail Saudi Arabia
| | | | - Mark Geoghegan
- Department of Physics and AstronomyUniversity of Sheffield Sheffield UK
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5
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Mostafavi SH, Li W, Clark KD, Stricker F, Alaniz JRD, Bardeen CJ. Photoinduced Deadhesion of a Polymer Film Using a Photochromic Donor–Acceptor Stenhouse Adduct. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00882] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
| | | | - Kyle D. Clark
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106-9510, United States
| | - Friedrich Stricker
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106-9510, United States
| | - Javier Read de Alaniz
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106-9510, United States
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6
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Allasia M, Passeggi MCG, Gugliotta LM, Minari RJ. Waterborne Hybrid Acrylic/Protein Nanocomposites with Enhanced Hydrophobicity by Incorporating a Water Repelling Protein. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b02518] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Mariana Allasia
- Polymer Reaction Engineering Group, INTEC (Universidad Nacional del Litoral-CONICET), Güemes 3450, Santa Fe 3000, Argentina
| | - Mario C. G. Passeggi
- Physics of Surfaces and Interfaces Laboratory, IFIS Litoral (Universidad Nacional del Litoral-CONICET), Güemes 3450, Santa Fe 3000, Argentina
- Facultad de Ingeniería Química, (Universidad Nacional del Litoral), Santiago del Estero 2829, Santa Fe 3000, Argentina
| | - Luis M. Gugliotta
- Polymer Reaction Engineering Group, INTEC (Universidad Nacional del Litoral-CONICET), Güemes 3450, Santa Fe 3000, Argentina
- Facultad de Ingeniería Química, (Universidad Nacional del Litoral), Santiago del Estero 2829, Santa Fe 3000, Argentina
| | - Roque J. Minari
- Polymer Reaction Engineering Group, INTEC (Universidad Nacional del Litoral-CONICET), Güemes 3450, Santa Fe 3000, Argentina
- Facultad de Ingeniería Química, (Universidad Nacional del Litoral), Santiago del Estero 2829, Santa Fe 3000, Argentina
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7
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Elbadawi M. Rheological and Mechanical Investigation into the Effect of Different Molecular Weight Poly(ethylene glycol)s on Polycaprolactone-Ciprofloxacin Filaments. ACS OMEGA 2019; 4:5412-5423. [PMID: 31459706 PMCID: PMC6648292 DOI: 10.1021/acsomega.8b03057] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 02/19/2019] [Indexed: 06/10/2023]
Abstract
Fused deposition fabrication (FDF) three-dimensional printing is a potentially transformative technology for fabricating pharmaceuticals. The state-of-the-art technology is still in its infancy and requires a concerted effort to realize its potential. One aspect includes the processing parameters of FDF and the effect of formulation thereto, which, to date, have not been thoroughly investigated. To progress understanding, the effect of different molecular weight poly(ethylene glycol)s (PEG) on polycaprolactone (PCL) loaded with ciprofloxacin (CIP) was investigated. A rheometer was used, and adapted accordingly, to analyze three processing aspects pertaining to FDF: viscosity, solidification, and adhesion. The results revealed that both CIP and PEG affected all three processing parameters. The salient findings were that the ternary blend with 10% w/w PEG 8000 exhibited rheological and adhesive properties ideal for FDF, as it provided a desirably shear-thinning filament that solidified rapidly, and improved the adhesion strength, in comparison to both the PCL-CIP binary blend and other ternary blends. In contrast, the ternary blend with 15% w/w PEG 200 was unfavorable; despite having a greater plasticizing effect, whereby the viscosity was markedly reduced, the sample provided no benefit to the solidification behavior of PCL-CIP and, in addition, failed to display adhesive behavior, which is a necessity for a successful print in FDF. The original findings herein set the precedent that the effect of drug and PEG on FDF processing should be considered beyond solely modifying the viscosity.
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Affiliation(s)
- Mohammed Elbadawi
- Control Engineering Group,
Department of Computer Science, Electrical and Space Engineering, Luleå University of Technology, SE-97187 Luleå, Sweden
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8
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Mehravar E, Gross MA, Leal GP, Reck B, Leiza JR, Asua JM. Phase Separation Driven On-Demand Debondable Waterborne Pressure-Sensitive Adhesives. Polymers (Basel) 2018; 10:E975. [PMID: 30960900 PMCID: PMC6403930 DOI: 10.3390/polym10090975] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 08/28/2018] [Accepted: 08/28/2018] [Indexed: 11/16/2022] Open
Abstract
A waterborne pressure-sensitive adhesive (PSA) that shows high adhesive performance and easy debondability on demand without leaving residues on the substrate (adhesive failure) has been developed. A key component of the PSA is a semicrystalline phase that is beneficial for the adhesive properties and that becomes fluid when heated above the melting temperature. Migration of this liquid-like polymer to the substrate-adhesive interface and hardening upon cooling results in a hard non-tacky interface that facilitates debonding. The effect of the particle morphology on the debonding ability is discussed.
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Affiliation(s)
- Ehsan Mehravar
- POLYMAT and Kimika Aplikatua Saila, Kimika Zientzien Fakultatea, University of the Basque Country UPV/EHU, Joxe Mari Korta Zentroa, Tolosa Hiribidea 72, 20018 Donostia-San Sebastian, Spain.
| | - Michael A Gross
- BASF SE, Dispersions & Colloidal Materials GMD-B001, Carl-Bosch-Strasse 38, 67056 Ludwigshafen, Germany.
| | - Gracia Patricia Leal
- POLYMAT and Kimika Aplikatua Saila, Kimika Zientzien Fakultatea, University of the Basque Country UPV/EHU, Joxe Mari Korta Zentroa, Tolosa Hiribidea 72, 20018 Donostia-San Sebastian, Spain.
| | - Bernd Reck
- BASF SE, Dispersions & Colloidal Materials GMD-B001, Carl-Bosch-Strasse 38, 67056 Ludwigshafen, Germany.
| | - Jose R Leiza
- POLYMAT and Kimika Aplikatua Saila, Kimika Zientzien Fakultatea, University of the Basque Country UPV/EHU, Joxe Mari Korta Zentroa, Tolosa Hiribidea 72, 20018 Donostia-San Sebastian, Spain.
| | - José M Asua
- POLYMAT and Kimika Aplikatua Saila, Kimika Zientzien Fakultatea, University of the Basque Country UPV/EHU, Joxe Mari Korta Zentroa, Tolosa Hiribidea 72, 20018 Donostia-San Sebastian, Spain.
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9
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Schulz M, Keddie JL. A critical and quantitative review of the stratification of particles during the drying of colloidal films. SOFT MATTER 2018; 14:6181-6197. [PMID: 30024010 DOI: 10.1039/c8sm01025k] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
For a wide range of applications, films are deposited from colloidal particles suspended in a volatile liquid. There is burgeoning interest in stratifying colloidal particles into separate layers within the final dry film to impart properties at the surface different to the interior. Here, we outline the mechanisms by which colloidal mixtures can stratify during the drying process. The problem is considered here as a three-way competition between evaporation of the continuous liquid, sedimentation of particles, and their Brownian diffusion. In particle mixtures, the sedimentation of larger or denser particles offers one means of stratification. When the rate of evaporation is fast relative to diffusion, binary mixtures of large and small particles can stratify with small particles on the top, according to physical models and computer simulations. We compare experimental results found in the scientific literature to the predictions of several recent models in a quantitative way. Although there is not perfect agreement between them, some general trends emerge in the experiments, simulations and models. The stratification of small particles on the top of a film is favoured when the colloidal suspension is dilute but when both the concentration of the small particles and the solvent evaporation rate are sufficiently high. A higher particle size ratio also favours stratification by size. This review points to ways that microstructures can be designed and controlled in colloidal materials to achieve desired properties.
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Affiliation(s)
- M Schulz
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, England, UK.
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10
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Ito S, Yamashita A, Akiyama H, Kihara H, Yoshida M. Azobenzene-Based (Meth)acrylates: Controlled Radical Polymerization, Photoresponsive Solid–Liquid Phase Transition Behavior, and Application to Reworkable Adhesives. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00156] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Shotaro Ito
- Research Institute of Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST Chugoku), 3-11-32, Kagamiyama, Higashihiroshima, Hiroshima 739-0046, Japan
| | - Aishi Yamashita
- Research Institute of Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8568, Japan
| | - Haruhisa Akiyama
- Research Institute of Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8568, Japan
| | - Hideyuki Kihara
- Research Institute of Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST Chugoku), 3-11-32, Kagamiyama, Higashihiroshima, Hiroshima 739-0046, Japan
| | - Masaru Yoshida
- Research Institute of Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST Chugoku), 3-11-32, Kagamiyama, Higashihiroshima, Hiroshima 739-0046, Japan
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11
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Mostafavi SH, Tong F, Dugger TW, Kisailus D, Bardeen CJ. Noncovalent Photochromic Polymer Adhesion. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00036] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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12
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Inozemtsev VA, Gamov AL, Moscalets AP. Soft to tough: ordering in and tack of polymeric materials. SOFT MATTER 2018; 14:2184-2193. [PMID: 29493692 DOI: 10.1039/c7sm02273e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In the present paper, adhesive properties (in terms of practical work of adhesion, Wa, and maximum stress in probe tack test) of blends of polyvinyl pyrrolidone (PVP) with polyethylene glycol (PEG-400) are studied at different level of stretching stress, applied perpendicular to the probe. The anisotropic behavior in both directions is investigated. Upon stretching, blends of 50/50 wt% PVP-PEG demonstrate little decrease in tack and little increase in maximum debonding stress. Whereas for more cohesive blends like PVP-PEG mixtures with down to 35 wt% of PEG, a significant reduction in Wa at the size of an order of a magnitude is observed. Similar behavior is measured with a commercial product from 3M with the trade name "Command". For the first time, the anisotropy of probe tack properties of two identical strips after stretching is demonstrated via a specially designed quasi-2D setup, where the external force is applied either along or transverse the long side of the quasi-2D substrate, resulting in a significant difference in the measured probe tack curves. This phenomenon has been described by the block model, developed by Yamaguchi et al. We extended the block model by introducing the stretching stress into the model. The differences are explained by the difference in kinetics of the cavity growth between the two directions.
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Affiliation(s)
- Vladimir A Inozemtsev
- Faculty of Physics, M.V. Lomonosov Moscow State University, 1 blg. 2 Leninskie Gory, Moscow 119234, Russia
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13
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Mehravar E, Gross MA, Agirre A, Reck B, Leiza JR, Asua JM. Importance of film morphology on the performance of thermo-responsive waterborne pressure sensitive adhesives. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2017.11.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Martín-Fabiani I, Fortini A, Lesage de la Haye J, Koh ML, Taylor SE, Bourgeat-Lami E, Lansalot M, D'Agosto F, Sear RP, Keddie JL. pH-Switchable Stratification of Colloidal Coatings: Surfaces "On Demand". ACS APPLIED MATERIALS & INTERFACES 2016; 8:34755-34761. [PMID: 27936562 DOI: 10.1021/acsami.6b12015] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Stratified coatings are used to provide properties at a surface, such as hardness or refractive index, which are different from underlying layers. Although time-savings are offered by self-assembly approaches, there have been no methods yet reported to offer stratification on demand. Here, we demonstrate a strategy to create self-assembled stratified coatings, which can be switched to homogeneous structures when required. We use blends of large and small colloidal polymer particle dispersions in water that self-assemble during drying because of an osmotic pressure gradient that leads to a downward velocity of larger particles. Our confocal fluorescent microscopy images reveal a distinct surface layer created by the small particles. When the pH of the initial dispersion is raised, the hydrophilic shells of the small particles swell substantially, and the stratification is switched off. Brownian dynamics simulations explain the suppression of stratification when the small particles are swollen as a result of reduced particle mobility, a drop in the pressure gradient, and less time available before particle jamming. Our strategy paves the way for applications in antireflection films and protective coatings in which the required surface composition can be achieved on demand, simply by adjusting the pH prior to deposition.
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Affiliation(s)
- Ignacio Martín-Fabiani
- Department of Physics, University of Surrey , Guildford, Surrey GU2 7XH, United Kingdom
- Department of Materials, Loughborough University , Loughborough, Leicestershire, LE11 3TU, United Kingdom
| | - Andrea Fortini
- Department of Physics, University of Surrey , Guildford, Surrey GU2 7XH, United Kingdom
| | - Jennifer Lesage de la Haye
- Univ Lyon, Université Claude Bernard Lyon 1 , CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes (C2P2), 43 Bd du 11 Novembre 1918, 69616 Villeurbanne, France
| | - Ming Liang Koh
- Univ Lyon, Université Claude Bernard Lyon 1 , CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes (C2P2), 43 Bd du 11 Novembre 1918, 69616 Villeurbanne, France
| | - Spencer E Taylor
- Centre for Petroleum and Surface Chemistry, Department of Chemistry, University of Surrey , Guildford, Surrey GU2 7XH, United Kingdom
| | - Elodie Bourgeat-Lami
- Univ Lyon, Université Claude Bernard Lyon 1 , CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes (C2P2), 43 Bd du 11 Novembre 1918, 69616 Villeurbanne, France
| | - Muriel Lansalot
- Univ Lyon, Université Claude Bernard Lyon 1 , CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes (C2P2), 43 Bd du 11 Novembre 1918, 69616 Villeurbanne, France
| | - Franck D'Agosto
- Univ Lyon, Université Claude Bernard Lyon 1 , CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes (C2P2), 43 Bd du 11 Novembre 1918, 69616 Villeurbanne, France
| | - Richard P Sear
- Department of Physics, University of Surrey , Guildford, Surrey GU2 7XH, United Kingdom
| | - Joseph L Keddie
- Department of Physics, University of Surrey , Guildford, Surrey GU2 7XH, United Kingdom
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15
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Alfhaid L, Seddon WD, Williams NH, Geoghegan M. Double-network hydrogels improve pH-switchable adhesion. SOFT MATTER 2016; 12:5022-5028. [PMID: 27160067 DOI: 10.1039/c6sm00656f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
For environmentally-switchable adhesive systems to be reused repeatedly, the adhesive strength must not deteriorate after each adhesion cycle. An important criterion to achieve this goal is that the integrity of the interface must be retained after each adhesion cycle. Furthermore, in order to have practical benefits, reversing the adhesion must be a relatively rapid process. Here, a double-network hydrogel of poly(methacrylic acid) and poly[oligo(ethylene glycol)methyl ether methacrylate] is shown to undergo adhesive failure during pH-switchable adhesion with a grafted (brush) layer of polycationic poly[2-(diethyl amino)ethyl methacrylate], and can be reused at least seven times. The surfaces are attached at pH 6 and detached at pH 1. A single-network hydrogel of poly(methacrylic acid), also exhibits pH-switchable adhesion with poly[2-(diethyl amino)ethyl methacrylate] but cohesive failure leads to an accumulation of the hydrogel on the brush surface and the hydrogel can only be reused at different parts of that surface. Even without an environmental stimulus (i.e. attaching and detaching at pH 6), the double-network hydrogel can be used up to three times at the same point on the brush surface. The single-network hydrogel cannot be reused under such circumstances. Finally, the time taken for the reuse of the double-network hydrogel is relatively rapid, taking no more than an hour to reverse the adhesion.
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Affiliation(s)
- Latifah Alfhaid
- Department of Physics and Astronomy, Hounsfield Road, University of Sheffield, Sheffield S3 7RH, UK.
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16
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Sato E, Yuri M, Fujii S, Nishiyama T, Nakamura Y, Horibe H. Liquid marble containing degradable polyperoxides for adhesion force-changeable pressure-sensitive adhesives. RSC Adv 2016. [DOI: 10.1039/c6ra10677c] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Non-stick liquid marbles containing a sticky polyperoxide provide a strong stick and dismantlability depending on external stimuli.
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Affiliation(s)
- Eriko Sato
- Department of Applied Chemistry and Bioengineering
- Graduate School of Engineering
- Osaka City University
- Osaka 558-8585
- Japan
| | - Michihiro Yuri
- Department of Applied Chemistry and Bioengineering
- Graduate School of Engineering
- Osaka City University
- Osaka 558-8585
- Japan
| | - Syuji Fujii
- Department of Applied Chemistry
- Faculty of Engineering
- Osaka Institute of Technology
- Osaka 535-8585
- Japan
| | - Takashi Nishiyama
- Department of Applied Chemistry and Bioengineering
- Graduate School of Engineering
- Osaka City University
- Osaka 558-8585
- Japan
| | - Yoshinobu Nakamura
- Department of Applied Chemistry
- Faculty of Engineering
- Osaka Institute of Technology
- Osaka 535-8585
- Japan
| | - Hideo Horibe
- Department of Applied Chemistry and Bioengineering
- Graduate School of Engineering
- Osaka City University
- Osaka 558-8585
- Japan
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18
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Schindler M, Koller M, Müller-Buschbaum P. Pressure-Sensitive Adhesives under the Influence of Relative Humidity: Inner Structure and Failure Mechanisms. ACS APPLIED MATERIALS & INTERFACES 2015; 7:12319-12327. [PMID: 25396744 DOI: 10.1021/am506265e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Model pressure-sensitive adhesive (PSA) films of the statistical copolymer P(EHA-stat-20MMA), which comprises 80% ethylhexyl acrylate (EHA) and 20% methyl methacrylate (MMA), are studied. The PSA films are stored under different relative humidities from <2% to 96% for 24 h and subsequently investigated concerning the near-surface composition profile by measuring X-ray reflectivity (XRR) and tack performance. For both types of measurements, special custom-made sample environments are used, which ensure constant temperature and relative humidity during the XRR and tack measurements. Different failure mechanisms of the adhesive bond are found by adjusting the relative humidity. XRR measurements evidence enrichment layers in vicinity to and at the surface depending on the provided relative humidity during the postproduction treatment, which also influence the tack performance. This finding is supported by tack measurements using punches with different roughness.
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Affiliation(s)
- Markus Schindler
- Physik-Department, Lehrstuhl für Funktionelle Materialien, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany
| | - Manuel Koller
- Physik-Department, Lehrstuhl für Funktionelle Materialien, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany
| | - Peter Müller-Buschbaum
- Physik-Department, Lehrstuhl für Funktionelle Materialien, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany
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19
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Akiyama H, Kanazawa S, Okuyama Y, Yoshida M, Kihara H, Nagai H, Norikane Y, Azumi R. Photochemically reversible liquefaction and solidification of multiazobenzene sugar-alcohol derivatives and application to reworkable adhesives. ACS APPLIED MATERIALS & INTERFACES 2014; 6:7933-7941. [PMID: 24818772 DOI: 10.1021/am501227y] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Multiazobenzene compounds, hexakis-O-[4-(phenylazo)phenoxyalkylcarboxyl]-D-mannitols and hexakis-O-[4-(4-hexylphenylazo)phenoxyalkylcarboxyl]-D-mannitols, exhibit photochemically reversible liquefaction and solidification at room temperature. Their photochemical and thermal phase transitions were investigated in detail through thermal analysis, absorption spectroscopy, and dynamic viscoelasticity measurements, and were compared with those of other sugar-alcohol derivatives. Tensile shear strength tests were performed to determine the adhesions of the compounds sandwiched between two glass slides to determine whether the compounds were suitable for application as adhesives. The adhesions were varied by alternately irradiating the compounds with ultraviolet and visible light to photoinduce phase transitions. The azobenzene hexyl tails, lengths of the methylene spacers, and differences in the sugar-alcohol structures affected the photoresponsive properties of the compounds.
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Affiliation(s)
- Haruhisa Akiyama
- Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
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20
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Power Density Threshold for Switching Off the Tack Adhesion of Colloidal Nanocomposites. MACROMOL CHEM PHYS 2014. [DOI: 10.1002/macp.201400011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Akram N, Gurney RS, Zuber M, Ishaq M, Keddie JL. Influence of Polyol Molecular Weight and Type on the Tack and Peel Properties of Waterborne Polyurethane Pressure-Sensitive Adhesives. MACROMOL REACT ENG 2013. [DOI: 10.1002/mren.201300109] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Nadia Akram
- Department of Chemistry; Quaid-i-Azam University; Islamabad 45320 Pakistan
| | - Robert S. Gurney
- Department of Physics; University of Surrey; Guildford Surrey GU2 7XH United Kingdom
| | - Mohammad Zuber
- Department of Applied Chemistry; Government College University; Faisalabad 38030 Pakistan
| | - Muhammad Ishaq
- Department of Chemistry; Quaid-i-Azam University; Islamabad 45320 Pakistan
| | - Joseph L. Keddie
- Department of Physics; University of Surrey; Guildford Surrey GU2 7XH United Kingdom
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Gurney RS, Dupin D, Siband E, Ouzineb K, Keddie JL. Large-area patterning of the tackiness of a nanocomposite adhesive by sintering of nanoparticles under IR radiation. ACS APPLIED MATERIALS & INTERFACES 2013; 5:2137-2145. [PMID: 23429909 DOI: 10.1021/am303184k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We present a simple technique to switch off the tack adhesion in selected areas of a colloidal nanocomposite adhesive. It is made from a blend of soft colloidal polymer particles and hard copolymer nanoparticles. In regions that are exposed to IR radiation, the nanoparticles sinter together to form a percolating skeleton, which hardens and stiffens the adhesive. The tack adhesion is lost locally. Masks can be made from silicone-coated disks, such as coins. Under the masks, adhesive island regions are defined with the surrounding regions being a nontacky coating. When optimizing the nanocomposite's adhesive properties, the addition of the hard nanoparticles raises the elastic modulus of the adhesive significantly, but adhesion is not lost because the yield point remains relatively low. During probe-tack testing, the soft polymer phases yield and enable fibrillation. After heating under IR radiation, the storage modulus increases by a factor of 5, and the yield point increases nearly by a factor of 6, such that yielding and fibrillation do not occur in the probe-tack testing. Hence, the adhesion is lost. Loading and unloading experiments indicate that a rigid skeleton is created when the nanoparticles sinter together, and it fractures under moderate strains. This patterning method is relatively simple and fast to execute. It is widely applicable to other blends of thermoplastic hard nanoparticles and larger soft particles.
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Affiliation(s)
- Robert S Gurney
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, UK
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