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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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2
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Bogdanov AV, Bobrovsky AY, Vorobiev AK. The orientation order of liquid‐crystalline polymer, measured by ESR and optical dichroism techniques. ACTA ACUST UNITED AC 2019. [DOI: 10.1002/polb.24836] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Alexey V. Bogdanov
- Chemistry DepartmentLomonosov Moscow State University Leninskie gory 1/3, Moscow 119991 Russian Federation
| | - Alexey Yu. Bobrovsky
- Chemistry DepartmentLomonosov Moscow State University Leninskie gory 1/3, Moscow 119991 Russian Federation
| | - Andrey Kh. Vorobiev
- Chemistry DepartmentLomonosov Moscow State University Leninskie gory 1/3, Moscow 119991 Russian Federation
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Švajdlenková H, Arrese-Igor S, Nógellová Z, Alegría A, Bartoš J. Molecular dynamic heterogeneity in relation to free volume and relaxation dynamics in organic glass-formers: oligomeric cis-1,4-poly(isoprene). Phys Chem Chem Phys 2018; 19:15215-15226. [PMID: 28561833 DOI: 10.1039/c7cp00446j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Herein, a combined study of the molecular rotation dynamics and free volume in cis-1,4-poly(isoprene) using two external probing techniques via ESR and PALS together with relaxation dynamics of the host medium via BDS is presented. The spectral evolution of the spin probe TEMPO from simulations over a wide range from 100 K up to 300 K exhibits three different regions of its correlation time consisting of a slow regime at low temperatures followed by the molecular dynamic heterogeneity zone from T = T = 155 K = 0.82 × T up to Tc ≅ 236 K = 1.26 × T and ending with a fast regime at high temperatures with the further characteristic ESR temperatures, T = 186 K ≅ T and T = 260 K. These are in close coincidence with four characteristic PALS temperatures: T = 160 K, T = 190 K, T = 227 K, and T = 263 K. Finally, using BDS, we revealed that the high-frequency features of the structural relaxation of 1,4-PIP 0.8k were related to the observed effects in the ESR and PALS response of the liquid state.
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Affiliation(s)
- H Švajdlenková
- Department of Structure and Physical Properties, Polymer Institute of SAS, Dúbravská cesta 9, SK-845 41 Bratislava, Slovakia.
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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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5
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Bartoš J, Švajdlenková H. On the mutual relationships between spin probe mobility, free volume and relaxation dynamics in organic glass-formers: Glycerol. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2016.12.064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Bartoš J, Švajdlenková H, Šauša O, Lukešová M, Ehlers D, Michl M, Lunkenheimer P, Loidl A. Molecular probe dynamics and free volume in organic glass-formers and their relationships to structural relaxation: 1-propanol. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:015101. [PMID: 26613507 DOI: 10.1088/0953-8984/28/1/015101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A joint study of the rotational dynamics and free volume in amorphous 1-propanol (1-PrOH) as a prototypical monohydroxy alcohol by electron spin resonance (ESR) or positron annihilation lifetime spectroscopy (PALS), respectively, is reported. The dynamic parameters of the molecular spin probe 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) and the annihilation ones of the atomic ortho-positronium (o-Ps) probe as a function of temperature are compared. A number of coincidences between various effects in the ESR and PALS responses at the corresponding characteristic ESR and PALS temperatures were found suggesting a common origin of the underlying dynamic processes that were identified using viscosity (VISC) in terms of the two-order parameter (TOP) model and broadband dielectric spectroscopy (BDS) data.
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Affiliation(s)
- J Bartoš
- Department of Structure and physical properties, Polymer Institute of SAS, Dúbravská cesta 9, SK-845 41 Bratislava, Slovakia
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7
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Švajdlenková H, Zgardzinska B, Lukešová M, Bartoš J. Spin probe dynamics in relation to free volume in crystalline organics from ESR and PALS: Cyclohexane. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2015.11.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Ngai KL, Capaccioli S, Prevosto D, Wang LM. Coupling of Caged Molecule Dynamics to JG β-Relaxation II: Polymers. J Phys Chem B 2015; 119:12502-18. [DOI: 10.1021/acs.jpcb.5b07293] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. L. Ngai
- CNR-IPCF, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
- State
Key Lab of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004 China
| | - S. Capaccioli
- CNR-IPCF, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
- Dipartimento
di Fisica, Università di Pisa, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
| | - D. Prevosto
- CNR-IPCF, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
| | - Li-Min Wang
- State
Key Lab of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004 China
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Barashkova II, Bermeshev MV, Wasserman AM, Yampolskii YP. Mobility of the spin probe TEMPO in glassy metathesis polymers with substituents containing flexible Si-O-Si groups. POLYMER SCIENCE SERIES A 2015. [DOI: 10.1134/s0965545x15030025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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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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11
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Khairy Y, Alvarez F, Arbe A, Colmenero J. Collective Features in Polyisobutylene. A Study of the Static and Dynamic Structure Factor by Molecular Dynamics Simulations. Macromolecules 2013. [DOI: 10.1021/ma401669y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Y. Khairy
- Centro
de Física de Materiales (CSIC−UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
| | - F. Alvarez
- Centro
de Física de Materiales (CSIC−UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
- Departamento de Física de Materiales (UPV/EHU), Apartado 1072, 20080 San Sebastián, Spain
| | - A. Arbe
- Centro
de Física de Materiales (CSIC−UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
| | - J. Colmenero
- Centro
de Física de Materiales (CSIC−UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
- Departamento de Física de Materiales (UPV/EHU), Apartado 1072, 20080 San Sebastián, Spain
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain
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12
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Khairy Y, Alvarez F, Arbe A, Colmenero J. Applicability of mode-coupling theory to polyisobutylene: a molecular dynamics simulation study. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:042302. [PMID: 24229167 DOI: 10.1103/physreve.88.042302] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Indexed: 06/02/2023]
Abstract
The applicability of Mode Coupling Theory (MCT) to the glass-forming polymer polyisobutylene (PIB) has been explored by using fully atomistic molecular dynamics simulations. MCT predictions for the so-called asymptotic regime have been successfully tested on the dynamic structure factor and the self-correlation function of PIB main-chain carbons calculated from the simulated cell. The factorization theorem and the time-temperature superposition principle are satisfied. A consistent fitting procedure of the simulation data to the MCT asymptotic power-laws predicted for the α-relaxation regime has delivered the dynamic exponents of the theory-in particular, the exponent parameter λ-the critical non-ergodicity parameters, and the critical temperature T(c). The obtained values of λ and T(c) agree, within the uncertainties involved in both studies, with those deduced from depolarized light scattering experiments [A. Kisliuk et al., J. Polym. Sci. Part B: Polym. Phys. 38, 2785 (2000)]. Both, λ and T(c)/T(g) values found for PIB are unusually large with respect to those commonly obtained in low molecular weight systems. Moreover, the high T(c)/T(g) value is compatible with a certain correlation of this parameter with the fragility in Angell's classification. Conversely, the value of λ is close to that reported for real polymers, simulated "realistic" polymers and simple polymer models with intramolecular barriers. In the framework of the MCT, such finding should be the signature of two different mechanisms for the glass-transition in real polymers: intermolecular packing and intramolecular barriers combined with chain connectivity.
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Affiliation(s)
- Y Khairy
- Centro de Física de Materiales (CSIC-UPV/EHU) - Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
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14
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Cameron GG, Miles IS, Bullock AT. Distribution in correlation times for rotational diffusion of spin probes in polymers. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/pi.4980190206] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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15
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Chernova DA, Vorobiev AK. Molecular mobility of nitroxide spin probes in glassy polymers: Models of the complex motion of spin probes. J Appl Polym Sci 2011. [DOI: 10.1002/app.33337] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Wu J, Huang G, Wang X, He X, Lei H. Confinement effect of polystyrene on the relaxation behavior of polyisobutylene. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/polb.22098] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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17
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Švajdlenková H, Bartoš J. Spin probe mobility in relation to free volume and relaxation dynamics of glass-formers: A series of spin probes in poly(isobutylene). ACTA ACUST UNITED AC 2009. [DOI: 10.1002/polb.21710] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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18
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Chernova DA, Vorobiev AKH. Molecular mobility of nitroxide spin probes in glassy polymers. Quasi-libration model. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/polb.21619] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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19
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Tiňo J, Mach P, Hloušková Z, Chodák I. Restriction of Spin Probe Motions in Polymer Composites Due to Chemical Factors. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2008. [DOI: 10.1080/10601329409350105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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20
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Kilburn D, Wawryszczuk J, Dlubek G, Pionteck J, Häßler R, Alam MA. Temperature and Pressure Dependence of the Free Volume in Polyisobutylene from Positron Lifetime and Pressure-Volume-Temperature Experiments. MACROMOL CHEM PHYS 2006. [DOI: 10.1002/macp.200600013] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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21
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Sridhar V, Choudhary RNP, Tripathy DK. Effect of carbon blacks on relaxation phenomenon of chlorobutyl vulcanizates. J Appl Polym Sci 2006. [DOI: 10.1002/app.23640] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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22
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Sridhar V, Chaudhary RNP, Tripathy DK. Effect of fillers on the relaxation behavior of chlorobutyl vulcanizates. J Appl Polym Sci 2006. [DOI: 10.1002/app.23148] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Riquet AM, Feigenbaum A, Colonna P, Lourdin D. Molecular mobility in starchy materials studied by electron spin resonance. J Appl Polym Sci 2003. [DOI: 10.1002/app.11753] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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25
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Triolo A, Lechner RE, Desmedt A, Telling MTF, Arrighi V. Complex Dynamics in Polyisobutylene Melts. Macromolecules 2002. [DOI: 10.1021/ma0201678] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. Triolo
- Istituto Processi Chimico Fisici, CNR, Messina, Italy; Hahn-Meitner Institut, BENSC, Berlin, Germany; ISIS Facility, Rutherford Appleton Laboratory, Chilton, OXON, UK; and Chemistry Department, Heriot-Watt University, Edinburgh, UK
| | - R. E. Lechner
- Istituto Processi Chimico Fisici, CNR, Messina, Italy; Hahn-Meitner Institut, BENSC, Berlin, Germany; ISIS Facility, Rutherford Appleton Laboratory, Chilton, OXON, UK; and Chemistry Department, Heriot-Watt University, Edinburgh, UK
| | - A. Desmedt
- Istituto Processi Chimico Fisici, CNR, Messina, Italy; Hahn-Meitner Institut, BENSC, Berlin, Germany; ISIS Facility, Rutherford Appleton Laboratory, Chilton, OXON, UK; and Chemistry Department, Heriot-Watt University, Edinburgh, UK
| | - M. T. F. Telling
- Istituto Processi Chimico Fisici, CNR, Messina, Italy; Hahn-Meitner Institut, BENSC, Berlin, Germany; ISIS Facility, Rutherford Appleton Laboratory, Chilton, OXON, UK; and Chemistry Department, Heriot-Watt University, Edinburgh, UK
| | - V. Arrighi
- Istituto Processi Chimico Fisici, CNR, Messina, Italy; Hahn-Meitner Institut, BENSC, Berlin, Germany; ISIS Facility, Rutherford Appleton Laboratory, Chilton, OXON, UK; and Chemistry Department, Heriot-Watt University, Edinburgh, UK
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Farago B, Arbe A, Colmenero J, Faust R, Buchenau U, Richter D. Intermediate length scale dynamics of polyisobutylene. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2002; 65:051803. [PMID: 12059584 DOI: 10.1103/physreve.65.051803] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2001] [Indexed: 05/23/2023]
Abstract
We report on a neutron spin echo investigation of the intermediate scale dynamics of polyisobutylene studying both the self-motion and the collective motion. The momentum transfer (Q) dependences of the self-correlation times are found to follow a Q(-2/beta) law in agreement with the picture of Gaussian dynamics. In the full Q range of observation, their temperature dependence is weaker than the rheological shift factor. The same is true for the stress relaxation time as seen in sound wave absorption. The collective times show both temperature dependences; at the structure factor peak, they follow the temperature dependence of the viscosity, but below the peak, one finds the stress relaxation behavior.
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Affiliation(s)
- B Farago
- Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France
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27
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Karatasos K, Ryckaert JP, Ricciardi R, Lauprêtre F. Methyl Dynamics and β-Relaxation in Polyisobutylene: Comparison between Experiment and Molecular Dynamics Simulations. Macromolecules 2002. [DOI: 10.1021/ma011290m] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. Karatasos
- Department of Physics, Polymer Physics CP-223, Université Libre de Bruxelles, Bd. du Triomphe, 1050 Brussels, Belgium; and Laboratoire de Recherche sur les Polymères, CNRS, 2 à 8 rue Henri Dunant, 94320 Thiais, France
| | - J.-P. Ryckaert
- Department of Physics, Polymer Physics CP-223, Université Libre de Bruxelles, Bd. du Triomphe, 1050 Brussels, Belgium; and Laboratoire de Recherche sur les Polymères, CNRS, 2 à 8 rue Henri Dunant, 94320 Thiais, France
| | - R. Ricciardi
- Department of Physics, Polymer Physics CP-223, Université Libre de Bruxelles, Bd. du Triomphe, 1050 Brussels, Belgium; and Laboratoire de Recherche sur les Polymères, CNRS, 2 à 8 rue Henri Dunant, 94320 Thiais, France
| | - F. Lauprêtre
- Department of Physics, Polymer Physics CP-223, Université Libre de Bruxelles, Bd. du Triomphe, 1050 Brussels, Belgium; and Laboratoire de Recherche sur les Polymères, CNRS, 2 à 8 rue Henri Dunant, 94320 Thiais, France
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28
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Affiliation(s)
- K. Karatasos
- Department of Physics, Polymer Physics CP-223, Université Libre de Bruxelles, Bd. du Triomphe, 1050 Brussels, Belgium
| | - J.-P. Ryckaert
- Department of Physics, Polymer Physics CP-223, Université Libre de Bruxelles, Bd. du Triomphe, 1050 Brussels, Belgium
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Investigation of the Dielectric beta-Process in Polyisobutylene by Incoherent Quasielastic Neutron Scattering. Macromolecules 1998; 31:4926-34. [PMID: 9680431 DOI: 10.1021/ma9717810] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Recently by dielectric spectroscopy a new secondary relaxation process in polyisobutylene (PIB) was detected showing all the signatures of a Johari-Goldstein relaxation [Richter, D; Arbe, A.; Colmenero, J.; Monkenbusch, M.; Farago, B.; Faust, R. Macromolecules 1998, 31, 1133]. Using high resolution neutron backscattering, we investigated the quasielastic neutron spectra from protonated PIB which are related to this process as a function of momentum transfer and temperature. In addition we studied the elastically scattered intensity over a wide temperature range. After multiple scattering corrections all results can be described consistently in terms of a local jump process with the distribution parameters from the dielectric beta-relaxation. The spatial extent of the associated protonic motion was determined to be d = 2.7 Å. A comparison with the existing body of data for PIB leads to the conclusion that the dielectric beta-process and the earlier found delta-process must be identical, thereby revising the assignment of the delta-process as due to methyl group rotation. Finally, we remark on aspects of the relation between quasielastic coherent and incoherent scattering and address the seemingly contradictory result of different length scales revealed for the same process with the two techniques.
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Richter D, Arbe A, Colmenero J, Monkenbusch M, Farago B, Faust R. Molecular Motions in Polyisobutylene: A Neutron Spin-Echo and Dielectric Investigation. Macromolecules 1998. [DOI: 10.1021/ma971340g] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- D. Richter
- Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany, Departamento de Física de Materiales, Universidad del País Vasco, Apartado 1072, 20080 San Sebastián, Spain, Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France, and Polymer Science Program, Department of Chemistry, University of Massachusetts Lowell, One University Avenue, Lowell, Massachusetts 01854
| | - A. Arbe
- Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany, Departamento de Física de Materiales, Universidad del País Vasco, Apartado 1072, 20080 San Sebastián, Spain, Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France, and Polymer Science Program, Department of Chemistry, University of Massachusetts Lowell, One University Avenue, Lowell, Massachusetts 01854
| | - J. Colmenero
- Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany, Departamento de Física de Materiales, Universidad del País Vasco, Apartado 1072, 20080 San Sebastián, Spain, Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France, and Polymer Science Program, Department of Chemistry, University of Massachusetts Lowell, One University Avenue, Lowell, Massachusetts 01854
| | - M. Monkenbusch
- Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany, Departamento de Física de Materiales, Universidad del País Vasco, Apartado 1072, 20080 San Sebastián, Spain, Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France, and Polymer Science Program, Department of Chemistry, University of Massachusetts Lowell, One University Avenue, Lowell, Massachusetts 01854
| | - B. Farago
- Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany, Departamento de Física de Materiales, Universidad del País Vasco, Apartado 1072, 20080 San Sebastián, Spain, Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France, and Polymer Science Program, Department of Chemistry, University of Massachusetts Lowell, One University Avenue, Lowell, Massachusetts 01854
| | - R. Faust
- Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany, Departamento de Física de Materiales, Universidad del País Vasco, Apartado 1072, 20080 San Sebastián, Spain, Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France, and Polymer Science Program, Department of Chemistry, University of Massachusetts Lowell, One University Avenue, Lowell, Massachusetts 01854
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Lee S, Gelerinter E. An e.p.r. spin probe study of the molecular motions of side and straight chain polymers and polymer/plasticizer mixtures. POLYMER 1994. [DOI: 10.1016/0032-3861(94)90299-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Gallez B, Debuyst R, Dejehet F, De Keyser JL, Lacour V, Demeure R, Dumont P. Relaxivity and molecular dynamics of spin labeled polysaccharides. MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE 1994. [DOI: 10.1007/bf01709801] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gallez B, Lacour V, Demeure R, Debuyst R, Dejehet F, De Keyser JL, Dumont P. Spin labelled arabinogalactan as MRI contrast agent. Magn Reson Imaging 1994; 12:61-9. [PMID: 8295509 DOI: 10.1016/0730-725x(94)92353-1] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
In this study, we report the synthesis and the evaluation as MRI contrast agent of arabinogalactan/pyrrolidinoxyl radicals (PCA) covalent adduct (SLAG:Spin Labelled ArabinoGalactan). Arabinogalactan was used as targeting device, as it is recognized by the asialoglycoprotein receptor specific to the hepatocytes. The higher relaxivity R1 in water of SLAG, compared with small hydrophilic nitroxyl radicals, was explained by the molecular dynamics study using EPR spectroscopy that showed some immobilization of the radical into the polysaccharide. A binding study on isolated hepatocytes revealed that SLAG still recognizes the asialoglycoprotein receptor. MR imaging was performed using spin-echo T1 weighted images on mice to compare the contrast effect obtained with SLAG and PCA after IV injection (1 mmol/kg free radical). The percent signal enhancement observed in the liver 5 min after IV injection was 40 +/- 3% and 13 +/- 5% for SLAG and PCA, respectively. The signal was also dramatically increased in the renal cortex. This latter effect as well as the prolonged duration of the contrast (+/- 3 h), indicates at least a partial nonselective biodistribution; the high concentration needed to obtain a contrast effect could account for the saturation of the asialoglycoprotein receptor and hence for the apparent nonselective biodistribution.
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Affiliation(s)
- B Gallez
- Department of Pharmaceutical Sciences, Catholic University of Louvain, Brussels, Belgium
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Gallez B, Debuyst R, Demeure R, Dejehet F, Grandin C, Van Beers B, Taper H, Pringot J, Dumont P. Evaluation of a nitroxyl fatty acid as liver contrast agent for magnetic resonance imaging. Magn Reson Med 1993; 30:592-9. [PMID: 8259059 DOI: 10.1002/mrm.1910300510] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
In this study, we report the synthesis and the evaluation as MRI contrast agent of a new compound (nitroxyl fatty acid, NFA), where a pyrrolidinoxyl radical (3-carboxy-proxyl, PCA) is linked to a fatty acid moiety. Fatty acids were selected as vector because they present a high affinity for the liver, their efficient cellular uptake being the result of a specific interaction with a transmembrane transporter (liver plasma membrane-fatty acid binding protein). The uptake of 3H-oleic acid is inhibited after the injection of 1 mmol/kg of NFA, suggesting that NFA recognizes the same transmembrane transporter as the natural fatty acids. The higher relaxivity R1 of NFA in albumin solutions, compared with PCA, was explained by the immobilization of the nitroxyl radical in the protein. MR imaging was performed using T1-weighted images on mice in order to compare the contrast effect obtained after the injection of 1 mmol/kg of radical. The % signal enhancement in the liver 5 min after intravenous injection was 49 +/- 4 and 14 +/- 5 for NFA and PCA, respectively. NFA allowed a better delimitation of some necrotic tumors (Novikoff hepatocarcinoma) due to its preferential uptake by the nontumorous tissue.
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Affiliation(s)
- B Gallez
- Department of Pharmaceutical Sciences, Catholic University of Louvain, Brussels
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Frick B, Richter D. Change of the vibrational dynamics near the glass transition in polyisobutylene: Inelastic neutron scattering on a nonfragile polymer. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:14795-14804. [PMID: 10005853 DOI: 10.1103/physrevb.47.14795] [Citation(s) in RCA: 99] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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39
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Egboh S, Tenhu H, Sundholm F. E.p.r. studies of spin-probed and spin-labelled poly(vinyl benzoate), poly(vinyl cinnamate) and poly(vinyl diisophthalate). POLYMER 1992. [DOI: 10.1016/0032-3861(92)91054-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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40
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A paramagnetic resonance study of the molecular motions of spin probes dissolved in poly (vinyl acetate). POLYMER 1992. [DOI: 10.1016/0032-3861(92)90010-t] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Tenhu H, Vaahtera K. Phase separation in polystyrene crosslinked with samples of poly(dimethyl siloxane) of various chain length. Eur Polym J 1991. [DOI: 10.1016/0014-3057(91)90163-i] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Hyde PD, Ediger MD. Rotational dynamics of anthracene and 9,10‐dimethylanthracene in polyisoprene. J Chem Phys 1990. [DOI: 10.1063/1.458166] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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44
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Jing D, Bokobza L, Monnerie L, Collart P, De Schryver F. Investigation of local molecular motions in bulk polymers through the emission properties of an intramolecular excimer-forming probe. POLYMER 1990. [DOI: 10.1016/0032-3861(90)90359-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Morris JF, Gelerinter E. Paramagnetic resonance studies of the molecular motions of spin probes dissolved in polymers and polymer/plasticizer mixtures. POLYMER 1989. [DOI: 10.1016/0032-3861(89)90398-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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47
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Fofana M, Veissier V, Viovy JL, Monnerie L. Investigation of the mobility of polybutadienes: 2. Fluorescence anisotropy decay of rod-like rigid probes. POLYMER 1989. [DOI: 10.1016/0032-3861(89)90382-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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48
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Bartoš J, Hloušková Z. Study of conformational-segmental mobility in linear polyethylene and isotactic polypropylene by the spin probe method. Colloid Polym Sci 1988. [DOI: 10.1007/bf01411503] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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49
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Cameron G, Miles IS, Bullock AT. Molecular dynamics in bulk and plasticized poly(vinyl acetate): a spin-probe study. POLYMER 1988. [DOI: 10.1016/0032-3861(88)90057-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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50
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Queslel J, Jarry J, Monnerie L. Stationary fluorescence depolarization study of mobility of rigid probes in bulk elastomers: Motion of dimethylanthracene and three trans-diphenylpolyenes inserted in polyisoprene, polybutadiene and random butadiene-styrene copolymers. POLYMER 1986. [DOI: 10.1016/0032-3861(86)90011-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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