1
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Mohottalalage SS, Kosgallana C, Senanayake M, Wijesinghe S, Osti NC, Perahia D. Molecular Insight into the Effects of Clustering on the Dynamics of Ionomers in Solutions. ACS Macro Lett 2023; 12:1118-1124. [PMID: 37493602 DOI: 10.1021/acsmacrolett.3c00353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
Ionizable groups tethered to polymers enable their many current and potential applications. However, these functionalities drive the formation of physical networks through clustering of the ionic groups, resulting in constrained dynamics of the macromolecules. Understanding the molecular origin of this hindrance remains a critical fundamental question, whose solution will directly impact the processing of ionizable polymers from molecules to viable materials. Here, using quasielastic neutron scattering accompanied by molecular dynamics simulations, segmental dynamics of slightly sulfonated polystyrene is studied in solutions as the cohesion of the ionic assemblies is tuned. We find that in cyclohexane the ionic assemblies act as centers of confinement, affecting dynamics both on macroscopic lengths and in the vicinity of the ionic assemblies. Addition of a small amount of ethanol affects the packing of the ionizable groups within the assemblies, which in turn enhances the chain dynamics.
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Affiliation(s)
- Supun S Mohottalalage
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States
| | - Chathurika Kosgallana
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States
| | - Manjula Senanayake
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Sidath Wijesinghe
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States
- Department of Chemistry, Appalachian State University, Boone, North Carolina 26808, United States
| | - Naresh C Osti
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Dvora Perahia
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States
- Department of Physics, Clemson University, Clemson, South Carolina 29631, United States
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2
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Bichler KJ, Jakobi B, Sakai VG, Klapproth A, Mole RA, Schneider GJ. Universality of Time-Temperature Scaling Observed by Neutron Spectroscopy on Bottlebrush Polymers. NANO LETTERS 2021; 21:4494-4499. [PMID: 33988366 PMCID: PMC8289293 DOI: 10.1021/acs.nanolett.1c01379] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 05/07/2021] [Indexed: 06/12/2023]
Abstract
The understanding of materials requires access to the dynamics over many orders of magnitude in time; however, single analytical techniques are restricted in their respective time ranges. Assuming a functional relationship between time and temperature is one viable tool to overcome these limits. Despite its frequent usage, a breakdown of this assertion at the glass-transition temperature is common. Here, we take advantage of time- and length-scale information in neutron spectroscopy to show that the separation of different processes is the minimum requirement toward a more universal picture at, and even below, the glass transition for our systems. This is illustrated by constructing the full proton mean-square displacement for three bottlebrush polymers from femto- to nanoseconds, with simultaneous information on the partial contributions from segmental relaxation, methyl group rotation, and vibrations. The information can be used for a better analysis of results from numerous techniques and samples, improving the overall understanding of materials properties.
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Affiliation(s)
- Karin J. Bichler
- Department
of Physics & Astronomy, Louisiana State
University, Baton
Rouge, Louisiana 70803, United States
| | - Bruno Jakobi
- Department
of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Victoria García Sakai
- ISIS
Facility, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Chilton, Didcot OX11 0QX, United Kingdom
| | - Alice Klapproth
- Australian
Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights 2234, NSW, Australia
| | - Richard A. Mole
- Australian
Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights 2234, NSW, Australia
| | - Gerald J. Schneider
- Department
of Physics & Astronomy, Louisiana State
University, Baton
Rouge, Louisiana 70803, United States
- Department
of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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3
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Khairy Y, Alvarez F, Arbe A, Colmenero J. Disentangling Self-Atomic Motions in Polyisobutylene by Molecular Dynamics Simulations. Polymers (Basel) 2021; 13:polym13040670. [PMID: 33672368 PMCID: PMC7927061 DOI: 10.3390/polym13040670] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/08/2021] [Accepted: 02/17/2021] [Indexed: 01/16/2023] Open
Abstract
We present fully atomistic molecular dynamics simulations on polyisobutylene (PIB) in a wide temperature range above the glass transition. The cell is validated by direct comparison of magnitudes computed from the simulation and measured by neutron scattering on protonated samples reported in previous works. Once the reliability of the simulation is assured, we exploit the information in the atomic trajectories to characterize the dynamics of the different kinds of atoms in PIB. All of them, including main-chain carbons, show a crossover from Gaussian to non-Gaussian behavior in the intermediate scattering function that can be described in terms of the anomalous jump diffusion model. The full characterization of the methyl-group hydrogen motions requires accounting for rotational motions. We show that the usually assumed statistically independence of rotational and segmental motions fails in this case. We apply the rotational rate distribution model to correlation functions calculated for the relative positions of methyl-group hydrogens with respect to the carbon atom at which they are linked. The contributions to the vibrational density of states are also discussed. We conclude that methyl-group rotations are coupled with the main-chain dynamics. Finally, we revise in the light of the simulations the hypothesis and conclusions made in previously reported neutron scattering investigations on protonated samples trying to address the origin of the dielectric β-process.
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Affiliation(s)
- Yasmin Khairy
- Physics Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt;
- Centro de Física de Materiales (CSIC, UPV/EHU), Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain; (F.A.); (A.A.)
| | - Fernando Alvarez
- Centro de Física de Materiales (CSIC, UPV/EHU), Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain; (F.A.); (A.A.)
- Materials Physics Center MPC, Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain
- Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología (UPV/EHU), Apartado 1072, E-20080 San Sebastián, Spain
| | - Arantxa Arbe
- Centro de Física de Materiales (CSIC, UPV/EHU), Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain; (F.A.); (A.A.)
- Materials Physics Center MPC, Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain
| | - Juan Colmenero
- Centro de Física de Materiales (CSIC, UPV/EHU), Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain; (F.A.); (A.A.)
- Materials Physics Center MPC, Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain
- Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología (UPV/EHU), Apartado 1072, E-20080 San Sebastián, Spain
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, E-20018 San Sebastián, Spain
- Correspondence:
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4
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Bichler KJ, Jakobi B, Sakai VG, Klapproth A, Mole RA, Schneider GJ. Short-Time Dynamics of PDMS- g-PDMS Bottlebrush Polymer Melts Investigated by Quasi-Elastic Neutron Scattering. Macromolecules 2020; 53:9553-9562. [PMID: 33191954 PMCID: PMC7659037 DOI: 10.1021/acs.macromol.0c01846] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Revised: 09/28/2020] [Indexed: 12/04/2022]
Abstract
We have studied the short-time dynamical behavior of polydimethylsiloxane (PDMS) bottlebrush polymers, PDMS-g-PDMS. The samples have similar backbone lengths but different side-chain lengths, resulting in a shape transition. Quasi-elastic neutron scattering was used to observe the dynamical changes inherent to these structural changes. The combination of data from three spectrometers enabled to follow the dynamics over broad frequency and temperature ranges, which included segmental relaxations and more localized motions. The latter, identified as the methyl group rotation, is described by a threefold jump model and shows higher activation energies compared to linear PDMS. The segmental relaxation times, τs, decrease with increasing molecular weight of the side chains but increase with momentum transfer, Q, following a power law, which suggests a non-Gaussian behavior for bottlebrush polymers.
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Affiliation(s)
- Karin J. Bichler
- Department
of Physics &Astronomy, Louisiana State
University, Baton
Rouge 70803, Louisiana, United States
| | - Bruno Jakobi
- Department
of Chemistry, Louisiana State University, Baton Rouge 70803, Louisiana, United States
| | - Victoria García Sakai
- ISIS
Facility, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Chilton, Didcot OX11 0QX, U.K.
| | - Alice Klapproth
- Australian
Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights 2234, New South Wales, Australia
| | - Richard A. Mole
- Australian
Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights 2234, New South Wales, Australia
| | - Gerald J. Schneider
- Department
of Physics &Astronomy, Louisiana State
University, Baton
Rouge 70803, Louisiana, United States
- Department
of Chemistry, Louisiana State University, Baton Rouge 70803, Louisiana, United States
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5
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Local Effects of Ring Topology Observed in Polymer Conformation and Dynamics by Neutron Scattering-A Review. Polymers (Basel) 2020; 12:polym12091884. [PMID: 32825628 PMCID: PMC7563567 DOI: 10.3390/polym12091884] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 08/14/2020] [Accepted: 08/17/2020] [Indexed: 11/24/2022] Open
Abstract
The physical properties of polymers depend on a range of both structural and chemical parameters, and in particular, on molecular topology. Apparently simple changes such as joining chains at a point to form stars or simply joining the two ends to form a ring can profoundly alter molecular conformation and dynamics, and hence properties. Cyclic polymers, as they do not have free ends, represent the simplest model system where reptation is completely suppressed. As a consequence, there exists a considerable literature and several reviews focused on high molecular weight cyclics where long range dynamics described by the reptation model comes into play. However, this is only one area of interest. Consideration of the conformation and dynamics of rings and chains, and of their mixtures, over molecular weights ranging from tens of repeat units up to and beyond the onset of entanglements and in both solution and melts has provided a rich literature for theory and simulation. Experimental work, particularly neutron scattering, has been limited by the difficulty of synthesizing well-characterized ring samples, and deuterated analogues. Here in the context of the broader literature we review investigations of local conformation and dynamics of linear and cyclic polymers, concentrating on poly(dimethyl siloxane) (PDMS) and covering a wide range of generally less high molar masses. Experimental data from small angle neutron scattering (SANS) and quasi-elastic neutron scattering (QENS), including Neutron Spin Echo (NSE), are compared to theory and computational predictions.
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6
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Prajapati PK, Kansara AM, Aswal VK, Singh PS. High oxygen permeable Zeolite‐4A poly(dimethylsiloxane) membrane for air separation. J Appl Polym Sci 2019. [DOI: 10.1002/app.48047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Pradeep K. Prajapati
- Membrane Science and Separation Technology Division, CSIR‐Central Salt and Marine Chemicals Research InstituteCouncil of Scientific and Industrial Research GB Marg, Bhavnagar 364002 Gujarat India
- Academy of Scientific and Innovative Research, CSIR‐Central Salt and Marine Chemicals Research InstituteCouncil of Scientific and Industrial Research GB Marg, Bhavnagar 364002 Gujarat India
| | - Ankit M. Kansara
- Membrane Science and Separation Technology Division, CSIR‐Central Salt and Marine Chemicals Research InstituteCouncil of Scientific and Industrial Research GB Marg, Bhavnagar 364002 Gujarat India
- Academy of Scientific and Innovative Research, CSIR‐Central Salt and Marine Chemicals Research InstituteCouncil of Scientific and Industrial Research GB Marg, Bhavnagar 364002 Gujarat India
| | - Vinod K. Aswal
- Solid State Physics DivisionBhabha Atomic Research Centre Trombay, Mumbai 400085 India
| | - Puyam S. Singh
- Membrane Science and Separation Technology Division, CSIR‐Central Salt and Marine Chemicals Research InstituteCouncil of Scientific and Industrial Research GB Marg, Bhavnagar 364002 Gujarat India
- Academy of Scientific and Innovative Research, CSIR‐Central Salt and Marine Chemicals Research InstituteCouncil of Scientific and Industrial Research GB Marg, Bhavnagar 364002 Gujarat India
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7
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Arrighi V, Gagliardi S, Ganazzoli F, Higgins JS, Raffaini G, Tanchawanich J, Taylor J, Telling MTF. Effect of Chain Length and Topological Constraints on Segmental Relaxation in Cyclic PDMS. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00397] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Valeria Arrighi
- Institute of Chemical Sciences, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Simona Gagliardi
- Institute of Chemical Sciences, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Fabio Ganazzoli
- Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, via L. Mancinelli 7, 20131 Milano, Italy
| | - Julia S. Higgins
- Chemical Engineering Department, Imperial College London, South Kensington
Campus, London SW7 2AZ, United Kingdom
| | - Giuseppina Raffaini
- Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, via L. Mancinelli 7, 20131 Milano, Italy
| | - Jeerachada Tanchawanich
- Institute of Chemical Sciences, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Jenny Taylor
- Institute of Chemical Sciences, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Mark T. F. Telling
- ISIS, Rutherford
Appleton Laboratory, Chilton, Didcot OX11 OQX, United Kingdom
- Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom
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8
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Massa CA, Pizzanelli S, Bercu V, Pardi L, Leporini D. Local Reversible Melting in Semicrystalline Poly(dimethylsiloxane): A High-Field Electron Paramagnetic Resonance Study. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00627] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Carlo Andrea Massa
- Istituto per i
Processi Chimico-Fisici-Consiglio Nazionale delle Ricerche (IPCF-CNR), via G. Moruzzi 1, 56124 Pisa, Italy
| | - Silvia Pizzanelli
- Istituto di Chimica
dei Composti OrganoMetallici-Consiglio Nazionale delle Ricerche (ICCOM-CNR), via G. Moruzzi 1, 56124 Pisa, Italy
| | - Vasile Bercu
- Department
of Physics, University of Bucharest, Str. Atomistilor 405, Magurele,
Jud. Ilfov, Bucharest RO-077125, Romania
| | - Luca Pardi
- Istituto per i
Processi Chimico-Fisici-Consiglio Nazionale delle Ricerche (IPCF-CNR), via G. Moruzzi 1, 56124 Pisa, Italy
| | - Dino Leporini
- Istituto per i
Processi Chimico-Fisici-Consiglio Nazionale delle Ricerche (IPCF-CNR), via G. Moruzzi 1, 56124 Pisa, Italy
- Dipartimento
di Fisica “Enrico Fermi”, Università di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
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9
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Affiliation(s)
- J.S. Higgins
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, United Kingdom
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10
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Kresse B, Hofmann M, Privalov AF, Fatkullin N, Fujara F, Rössler EA. All Polymer Diffusion Regimes Covered by Combining Field-Cycling and Field-Gradient 1H NMR. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00855] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- B. Kresse
- Institut
für Festkörperphysik, TU Darmstadt, Hochschulstr. 6, D-64289 Darmstadt, Germany
| | - M. Hofmann
- Experimentalphysik
II, Universität Bayreuth, D-95440 Bayreuth, Germany
| | - A. F. Privalov
- Institut
für Festkörperphysik, TU Darmstadt, Hochschulstr. 6, D-64289 Darmstadt, Germany
| | - N. Fatkullin
- Institute
of Physics, Kazan Federal University, Kazan 420008 Tatarstan, Russia
| | - F. Fujara
- Institut
für Festkörperphysik, TU Darmstadt, Hochschulstr. 6, D-64289 Darmstadt, Germany
| | - E. A. Rössler
- Experimentalphysik
II, Universität Bayreuth, D-95440 Bayreuth, Germany
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11
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Massa CA, Pizzanelli S, Bercu V, Pardi L, Leporini D. Constrained and Heterogeneous Dynamics in the Mobile and the Rigid Amorphous Fractions of Poly(dimethylsiloxane): A Multifrequency High-Field Electron Paramagnetic Resonance Study. Macromolecules 2014. [DOI: 10.1021/ma501565z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Carlo Andrea Massa
- Istituto per i
Processi Chimico-Fisici-Consiglio Nazionale delle Ricerche (IPCF-CNR), via G. Moruzzi 1, 56124 Pisa, Italy
| | - Silvia Pizzanelli
- Istituto di Chimica
dei Composti OrganoMetallici-Consiglio Nazionale delle Ricerche (ICCOM-CNR), via G. Moruzzi 1, 56124 Pisa, Italy
| | - Vasile Bercu
- Department
of Physics, University of Bucharest, Str. Atomistilor 405, Ilfov, RO-077125, Romania
| | - Luca Pardi
- Istituto per i
Processi Chimico-Fisici-Consiglio Nazionale delle Ricerche (IPCF-CNR), via G. Moruzzi 1, 56124 Pisa, Italy
| | - Dino Leporini
- Istituto per i
Processi Chimico-Fisici-Consiglio Nazionale delle Ricerche (IPCF-CNR), via G. Moruzzi 1, 56124 Pisa, Italy
- Dipartimento
di Fisica “Enrico Fermi”, Università di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
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12
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Paternó G, Cacialli F, García-Sakai V. Structural and dynamical characterization of P3HT/PCBM blends. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.10.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13
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Fotiadou S, Karageorgaki C, Chrissopoulou K, Karatasos K, Tanis I, Tragoudaras D, Frick B, Anastasiadis SH. Structure and Dynamics of Hyperbranched Polymer/Layered Silicate Nanocomposites. Macromolecules 2013. [DOI: 10.1021/ma302405q] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S. Fotiadou
- Institute of Electronic Structure
and Laser, Foundation for Research and Technology—Hellas, P.O. Box 1527, 711 10 Heraklion, Crete, Greece
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki,
Greece
| | - C. Karageorgaki
- Institute of Electronic Structure
and Laser, Foundation for Research and Technology—Hellas, P.O. Box 1527, 711 10 Heraklion, Crete, Greece
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki,
Greece
| | - K. Chrissopoulou
- Institute of Electronic Structure
and Laser, Foundation for Research and Technology—Hellas, P.O. Box 1527, 711 10 Heraklion, Crete, Greece
| | - K. Karatasos
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki,
Greece
| | - I. Tanis
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki,
Greece
| | - D. Tragoudaras
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki,
Greece
| | - B. Frick
- Institut Laue Langevin (ILL), 6 rue Jules Horowitz, F38042 Grenoble, France
| | - S. H. Anastasiadis
- Institute of Electronic Structure
and Laser, Foundation for Research and Technology—Hellas, P.O. Box 1527, 711 10 Heraklion, Crete, Greece
- Department of Chemistry, University of Crete, P.O. Box 2208, 710 03 Heraklion
Crete, Greece
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14
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Arrighi V, Tanchawanich J, Telling MTF. Molar Mass Dependence of Polyethylene Chain Dynamics. A Quasi-Elastic Neutron Scattering Investigation. Macromolecules 2012. [DOI: 10.1021/ma301922j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- V. Arrighi
- Chemistry, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh, U.K
| | - J. Tanchawanich
- Chemistry, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh, U.K
| | - Mark T. F. Telling
- ISIS, Rutherford Appleton Laboratory, Chilton, Didcot OX11 OQX, U.K
- Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K
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15
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Colmenero J, Arbe A. Recent progress on polymer dynamics by neutron scattering: From simple polymers to complex materials. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/polb.23178] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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16
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Jadav GL, Aswal VK, Bhatt H, Chaudhari JC, Singh PS. Influence of film thickness on the structure and properties of PDMS membrane. J Memb Sci 2012. [DOI: 10.1016/j.memsci.2012.05.043] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Zhang W, Zheng Y, Orsini L, Morelli A, Galli G, Chiellini E, Carpenter EE, Wynne KJ. More fluorous surface modifier makes it less oleophobic: fluorinated siloxane copolymer/PDMS coatings. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:5848-55. [PMID: 20000339 PMCID: PMC2854250 DOI: 10.1021/la903770s] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
A copolyacrylate with semifluorinated and polydimethylsiloxane side chains (D5-3) was used as a surface modifier for a condensation-cured PDMS coating. The decyl fluorous group is represented by "D"; "5" is a 5 kDa silicone, and "3" is the mole ratio of fluorous to silicone side chains. Wetting behavior was assessed by dynamic contact angle (DCA) analysis using isopropanol, which differentiates silicone and fluorous wetting behavior. Interestingly, a maximum in surface oleophobicity was found at low D5-3 concentration (0.4 wt %). Higher concentrations result in decreased oleophobicity, as reflected in decreased contact angles. To understand this unexpected observation, dynamic light scattering (DLS) studies were initiated on a model system consisting of hydroxyl-terminated PDMS (18 kDa) containing varying amounts of D5-3. DLS revealed D5-3 aggregation to be a function of temperature and concentration. A model is proposed by which D5-3 surface concentration is depleted via phase separation favoring D5-3 aggregation at concentrations >0.4 wt %, that is, the cmc. This model suggests increasing aggregate/micelle concentrations at increased D5-3 concentration. Bulk morphologies studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM) support this model by showing increased aggregate concentrations with increased D5-3 > 0.4 wt %.
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Affiliation(s)
- Wei Zhang
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, 601 West Main St., Richmond, VA 23284-3028
| | - Ying Zheng
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, 601 West Main St., Richmond, VA 23284-3028
| | - Lorenzo Orsini
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, 601 West Main St., Richmond, VA 23284-3028
| | - Andrea Morelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, UdR Pisa – INSTM, Via Risorgimento 35, 56126 Pisa, Italy
| | - Giancarlo Galli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, UdR Pisa – INSTM, Via Risorgimento 35, 56126 Pisa, Italy
| | - Emo Chiellini
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, UdR Pisa – INSTM, Via Risorgimento 35, 56126 Pisa, Italy
| | | | - Kenneth J. Wynne
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, 601 West Main St., Richmond, VA 23284-3028
- To whom correspondence should be addressed. Chemical and Life Science Engineering, Virginia Commonwealth University, 601 W. Main Street, Richmond, VA 23284-3028, Ph: 804-828-9303, Fax:804-828-3846,
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18
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Fotiadou S, Chrissopoulou K, Frick B, Anastasiadis SH. Structure and dynamics of polymer chains in hydrophilic nanocomposites. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/polb.21974] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Smuda C, Busch S, Wagner B, Unruh T. Methyl group dynamics in glassy, polycrystalline, and liquid coenzyme Q10 studied by quasielastic neutron scattering. J Chem Phys 2008; 129:074507. [PMID: 19044783 DOI: 10.1063/1.2967188] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Christoph Smuda
- Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universitat Munchen, Lichtenbergstrasse 1, D-85747 Garching b. Munchen, Germany
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Telling MTF, Neylon C, Kilcoyne SH, Arrighi V. Anharmonic Behavior in the Multisubunit Protein Apoferritin as Revealed by Quasi-Elastic Neutron Scattering. J Phys Chem B 2008; 112:10873-8. [DOI: 10.1021/jp801779x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mark. T. F. Telling
- ISIS Facility, Science and Technology Facilities Council (STFC), Rutherford Appleton Laboratory, Chilton, OX11 OQX, U.K., Institute for Materials Research, University of Salford, Salford, M5 4WT U.K., and School of EPS—Chemistry, Heriot-Watt University, Edinburgh, EH14 4AS, U.K
| | - Cameron Neylon
- ISIS Facility, Science and Technology Facilities Council (STFC), Rutherford Appleton Laboratory, Chilton, OX11 OQX, U.K., Institute for Materials Research, University of Salford, Salford, M5 4WT U.K., and School of EPS—Chemistry, Heriot-Watt University, Edinburgh, EH14 4AS, U.K
| | - Susan H. Kilcoyne
- ISIS Facility, Science and Technology Facilities Council (STFC), Rutherford Appleton Laboratory, Chilton, OX11 OQX, U.K., Institute for Materials Research, University of Salford, Salford, M5 4WT U.K., and School of EPS—Chemistry, Heriot-Watt University, Edinburgh, EH14 4AS, U.K
| | - Valeria Arrighi
- ISIS Facility, Science and Technology Facilities Council (STFC), Rutherford Appleton Laboratory, Chilton, OX11 OQX, U.K., Institute for Materials Research, University of Salford, Salford, M5 4WT U.K., and School of EPS—Chemistry, Heriot-Watt University, Edinburgh, EH14 4AS, U.K
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21
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Tanchawanich J, Arrighi V, Sacchi MC, Telling MTF, Triolo A. Fast and Slow Dynamics of Isotactic Polypropylene Melts. Macromolecules 2008. [DOI: 10.1021/ma071412w] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jeerachada Tanchawanich
- Chemistry, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh EH14 4AS, UK
| | - Valeria Arrighi
- Chemistry, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh EH14 4AS, UK
| | | | | | - Alessandro Triolo
- Istituto Processi Chimico-Fisici, Sezione di Messina-CNR, Messina, Italy
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22
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Ferguson R, Arrighi V, McEwen IJ, Gagliardi S, Triolo A. An Improved Algorithm for the Fourier Integral of the KWW Function and Its Application to Neutron Scattering and Dielectric Data. J MACROMOL SCI B 2006. [DOI: 10.1080/00222340600939419] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- R. Ferguson
- a Chemistry, School of Engineering and Physical Sciences , Heriot‐Watt University , Edinburgh, UK
| | - V. Arrighi
- a Chemistry, School of Engineering and Physical Sciences , Heriot‐Watt University , Edinburgh, UK
| | - I. J. McEwen
- a Chemistry, School of Engineering and Physical Sciences , Heriot‐Watt University , Edinburgh, UK
| | - S. Gagliardi
- a Chemistry, School of Engineering and Physical Sciences , Heriot‐Watt University , Edinburgh, UK
- b Hyaltech Ltd. , Research Avenue South, Heriot Watt Research Park , Edinburgh, EH14 4AP, UK
| | - A. Triolo
- a Chemistry, School of Engineering and Physical Sciences , Heriot‐Watt University , Edinburgh, UK
- c Chemistry, School of Engineering and Physical Sciences , Heriot‐Watt University , Edinburgh, EH14 4AS, UK
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23
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Quasielastic neutron scattering measurements of fast process and methyl group dynamics in glassy poly(vinyl acetate). Chem Phys 2006. [DOI: 10.1016/j.chemphys.2006.06.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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24
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Colmenero J, Moreno AJ, Alegría A. Neutron scattering investigations on methyl group dynamics in polymers. Prog Polym Sci 2005. [DOI: 10.1016/j.progpolymsci.2005.08.001] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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