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Ngai KL. Why the Brillouin Light Scattering Relaxation Times of Molten Zinc Chloride Are Shorter and Weaker in Temperature Dependence than the Structural Relaxation Times from Depolarized Light and Neutron Spin Echo Spectroscopy. J Phys Chem A 2021; 125:2759-2763. [PMID: 33759529 DOI: 10.1021/acs.jpca.1c00761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A longstanding problem in the Brillouin light scattering (BLS) study of polymers is the relaxation times τBLS(T) being more than an order of magnitude shorter than the α-relaxation times τα(T) determined by dielectric, depolarized light scattering (DLS), and molecular dynamics simulations. In tackling the problem, τBLS(T) was identified with the relaxation time τ0(T) of the primitive relaxation in the coupling model, which can be calculated from τα(T) and the stretch exponent βK of the Kohlrausch correlation function for the α-relaxation.. The problem was solved by finding that indeed τ0(T) is in good agreement with τBLS(T). A recent work performed the neutron spin echo study of the structural α-relaxation of the network ionic liquid ZnCl2 and found the same anomaly as polymers. The α-relaxation time τNSE(T) from neutron spin echo (NSE) as well as the α-relaxation time τDLS(T) from DLS of ZnCl2 are much longer than τBLS(T) from BLS obtained before by several research groups. The finding of the same anomaly in ZnCl2 and polymers with very different chemical and physical structures offers an opportunity to critically test the explanation given before. The test was carried out by calculating the primitive relaxation times τ0,DLS(T) and τ0,NSE(T) from τDLS(T) and τNSE(T), respectively, in zinc chloride. Good agreements of τBLS(T) from BLS with τ0,DLS(T) and τ0,NSE(T) were found and thus the explanation given for polymers remains valid for ZnCl2. The test was extended to glycerol by comparing τBLS(T) with τ0,ICNS(T) and τ0,CNS(T) calculated from the α-relaxation time τICNS(T) and τCNS(T) from incoherent and coherent neutron scattering, respectively. There is good agreement between τBLS(T) and τ0,ICNS(T) in glycerol. There is also semiquantitative agreement of τBLS(T) with τ0,DS(T) from dielectric spectroscopy as well as τ0,CNS(T). Thus, the explanation for polymers is verified in the two very different glass formers, ZnCl2 and glycerol, and it is an advancement in the application of BLS to study the dynamics of glass formers.
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Affiliation(s)
- K L Ngai
- CNR-IPCF, Largo Bruno Pontecorvo 3, Pisa I-56127, Italy
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2
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Ngai KL, Fytas G. Why the Relaxation Times of Polymers from Brillouin Light Spectroscopy Are Much Shorter than the Primary α-Relaxation Times. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01849] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. L. Ngai
- CNR-IPCF, Dipartimento di Fisica, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
| | - George Fytas
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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3
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Urakawa O, Yamane M, Tomie S, Inoue T, Shikata T, Adachi K. Relationship between global and segmental dynamics of poly(butylene oxide) studied by broadband dielectric spectroscopy. J Chem Phys 2018; 148:034904. [DOI: 10.1063/1.5006364] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Affiliation(s)
- Osamu Urakawa
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Minoru Yamane
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Shota Tomie
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Tadashi Inoue
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Toshiyuki Shikata
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Keiichiro Adachi
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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Jespersen ML, Mirau PA, von Meerwall ED, Koerner H, Vaia RA, Fernandes NJ, Giannelis EP. Hierarchical Canopy Dynamics of Electrolyte-Doped Nanoscale Ionic Materials. Macromolecules 2013. [DOI: 10.1021/ma402002a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael L. Jespersen
- Materials and Manufacturing Directorate, Air Force Research Laboratory, 2941 Hobson Way, Wright-Patterson Air Force
Base, Ohio 45433, United States
- University of Dayton Research Institute, 300 College Park, Dayton, Ohio 45469, United States
| | - Peter A. Mirau
- Materials and Manufacturing Directorate, Air Force Research Laboratory, 2941 Hobson Way, Wright-Patterson Air Force
Base, Ohio 45433, United States
| | | | - Hilmar Koerner
- Materials and Manufacturing Directorate, Air Force Research Laboratory, 2941 Hobson Way, Wright-Patterson Air Force
Base, Ohio 45433, United States
| | - Richard A. Vaia
- Materials and Manufacturing Directorate, Air Force Research Laboratory, 2941 Hobson Way, Wright-Patterson Air Force
Base, Ohio 45433, United States
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5
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Recent NMR investigations on molecular dynamics of polymer melts in bulk and in confinement. Curr Opin Colloid Interface Sci 2013. [DOI: 10.1016/j.cocis.2013.03.005] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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6
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What is the flow activation volume of entangled polymer melts? Colloid Polym Sci 2012. [DOI: 10.1007/s00396-011-2519-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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7
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Kaszyńska J, Hilczer B, Biskupski P. Segmental dynamics in poly(vinylidene fluoride) studied by dielectric, mechanical and nuclear magnetic resonance spectroscopies. Polym Bull (Berl) 2011. [DOI: 10.1007/s00289-011-0660-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Affiliation(s)
- José A. Martins
- a Departamento de Engenharia de Polímeros , Universidade do Minho , Campus de Azurém Guimarães, Portugal
- b CICECO , Universidade de Aveiro , Aveiro, Portugal
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Jespersen ML, Mirau PA, von Meerwall E, Vaia RA, Rodriguez R, Giannelis EP. Canopy dynamics in nanoscale ionic materials. ACS NANO 2010; 4:3735-3742. [PMID: 20536222 DOI: 10.1021/nn100112h] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Nanoscale ionic materials (NIMS) are organic-inorganic hybrids in which a core nanostructure is functionalized with a covalently attached corona and an ionically tethered organic canopy. NIMS are engineered to be liquids under ambient conditions in the absence of solvent and are of interest for a variety of applications. We have used nuclear magnetic resonance (NMR) relaxation and pulse-field gradient (PFG) diffusion experiments to measure the canopy dynamics of NIMS prepared from 18-nm silica cores modified by an alkylsilane monolayer possessing terminal sulfonic acid functionality, paired with an amine-terminated ethylene oxide/propylene oxide block copolymer canopy. Carbon NMR studies show that the block copolymer canopy is mobile both in the bulk and in the NIMS and that the fast (ns) dynamics are insensitive to the presence of the silica nanoparticles. Canopy diffusion in the NIMS is slowed relative to the neat canopy, but not to the degree predicted from the diffusion of hard-sphere particles. Canopy diffusion is not restricted to the surface of the nanoparticles and shows unexpected behavior upon addition of excess canopy. Taken together, these data indicate that the liquid-like behavior in NIMS is due to rapid exchange of the block copolymer canopy between the ionically modified nanoparticles.
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Affiliation(s)
- Michael L Jespersen
- Air Force Research Laboratories, Materials and Manufacturing Directorate, Wright-Patterson AFB, Ohio 45433, USA
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10
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Boland EK, Liu J, Maranas JK. A molecular picture of motion in polyolefins. J Chem Phys 2010; 132:144901. [DOI: 10.1063/1.3366660] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Paluch M, Pawlus S, Sokolov AP, Ngai KL. Sub-Rouse Modes in Polymers Observed by Dielectric Spectroscopy. Macromolecules 2010. [DOI: 10.1021/ma9027382] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marian Paluch
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - Sebastian Pawlus
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - Alexei P. Sokolov
- Chemical Sciences Division, Oak Ridge National Laboratory, Tennessee 37831-6197, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600
| | - K. L. Ngai
- Naval Research Laboratory, Washington, D.C. 20375-5320
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12
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Molten state and solvent-free systems studied by NMR spectroscopy: addition reactions catalyzed by transition metal complexes. Russ Chem Bull 2009. [DOI: 10.1007/s11172-008-0114-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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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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Heffernan JV, Budzien J, Avila F, Dotson TC, Aston VJ, McCoy JD, Adolf DB. Rotational relaxation in simple chain models. J Chem Phys 2007; 127:214902. [DOI: 10.1063/1.2798755] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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15
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Neelakantan A, Maranas JK. Spatial regimes in the dynamics of polyolefins: collective motion. J Chem Phys 2006; 120:1617-26. [PMID: 15268289 DOI: 10.1063/1.1633255] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Molecular simulation is used to characterize the spatial dependence of collective motion in four saturated hydrocarbon polymers. The observable is the distinct intermediate scattering function, as measured in coherent quasielastic neutron scattering experiments. Ranges of 0.01-1000 ps in time and 2-14 A in spatial scale are covered. In this time range, a two-step relaxation, consisting of a fast exponential decay and a slower stretched decay, is observed for all spatial scales. The relaxation times for the fast process are very similar to those obtained by following self motion, with a small modulation of relaxation times near the peak in the static structure factor which is well described by the narrowing picture suggested by de Gennes. For the slow process, self and collective relaxation times have larger numerical differences and follow different scaling with spatial scale. The modulation of slow relaxation times is larger than that observed for the fast process, but is overestimated by the de Gennes prediction, which only works qualitatively.
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Affiliation(s)
- Arun Neelakantan
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Forte C, Geppi M, Malvaldi M, Mattoli V. Dynamics of an Amorphous Polymer by an Improved NMR Approach Based on the Simultaneous Analysis of 1H and 13C Relaxation Times. J Phys Chem B 2004. [DOI: 10.1021/jp049492i] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Claudia Forte
- Istituto per i Processi Chimico-Fisici, CNR, Area della Ricerca, Via G. Moruzzi 1, 56124 Pisa, Italy, and Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy
| | - Marco Geppi
- Istituto per i Processi Chimico-Fisici, CNR, Area della Ricerca, Via G. Moruzzi 1, 56124 Pisa, Italy, and Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy
| | - Marco Malvaldi
- Istituto per i Processi Chimico-Fisici, CNR, Area della Ricerca, Via G. Moruzzi 1, 56124 Pisa, Italy, and Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy
| | - Virgilio Mattoli
- Istituto per i Processi Chimico-Fisici, CNR, Area della Ricerca, Via G. Moruzzi 1, 56124 Pisa, Italy, and Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy
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17
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Doxastakis M, Theodorou DN, Fytas G, Kremer F, Faller R, Müller-Plathe F, Hadjichristidis N. Chain and local dynamics of polyisoprene as probed by experiments and computer simulations. J Chem Phys 2003. [DOI: 10.1063/1.1603720] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Arrighi V, Batt-Coutrot D, Zhang C, Telling MTF, Triolo A. Effect of tacticity on the local dynamics of polypropylene melts. J Chem Phys 2003. [DOI: 10.1063/1.1579476] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Dais P, Vlachou S, Taravel FR. (13)C nuclear magnetic relaxation study of segmental dynamics of the heteropolysaccharide pullulan in dilute solutions. Biomacromolecules 2003; 2:1137-47. [PMID: 11777385 DOI: 10.1021/bm010073q] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
(13)C spin-lattice relaxation times (T(1)) and nuclear Overhauser enhancements (NOE) were measured as a function of temperature and magnetic field strength for the heteropolysaccharide pullulan in two solvents, water and dimethyl sulfoxide. The relaxation data of the endocyclic ring carbons were successfully interpreted in terms of chain segmental motions by using the bimodal time-correlation function of Dejean de la Batie, Laupretre, and Monnerie. On the basis of the calculated correlation times for segmental motion, the flexibilities of the pullulan chain at a repeat-unit level have been studied and compared with the segmental mobility of the homopolysaccharides amylose and dextran in the same solvents. The internal rotation of the free hydroxymethyl groups about the exocyclic C-5 [bond] C-6 bonds superimposed on segmental motion has been described as a diffusion process of restricted amplitude. The rate and amplitude of the internal rotation of the free hydroxymethyl groups were not affected by the local geometry of the pullulan chain.
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Affiliation(s)
- P Dais
- NMR Laboratory, Department of Chemistry, University of Crete, Iraklion, Crete, Greece.
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20
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Ahumada O, Theodorou DN, Triolo A, Arrighi V, Karatasos C, Ryckaert JP. Segmental Dynamics of Atactic Polypropylene As Revealed by Molecular Simulations and Quasielastic Neutron Scattering. Macromolecules 2002. [DOI: 10.1021/ma011807u] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Oscar Ahumada
- Department of Chemical Engineering, University of Patras and ICE/HT-FORTH, GR-26500 Patras, Greece, Chemistry Department, Heriot-Watt University Edinburgh, EH14 4AS, United Kingdom, and Laboratoire de Physique des Polymères, CP223, Université Libre de Bruxelles, Boulevard de Triomphe, B-1050 Bruxelles, Belgique
| | - Doros N. Theodorou
- Department of Chemical Engineering, University of Patras and ICE/HT-FORTH, GR-26500 Patras, Greece, Chemistry Department, Heriot-Watt University Edinburgh, EH14 4AS, United Kingdom, and Laboratoire de Physique des Polymères, CP223, Université Libre de Bruxelles, Boulevard de Triomphe, B-1050 Bruxelles, Belgique
| | - Alessandro Triolo
- Department of Chemical Engineering, University of Patras and ICE/HT-FORTH, GR-26500 Patras, Greece, Chemistry Department, Heriot-Watt University Edinburgh, EH14 4AS, United Kingdom, and Laboratoire de Physique des Polymères, CP223, Université Libre de Bruxelles, Boulevard de Triomphe, B-1050 Bruxelles, Belgique
| | - Valeria Arrighi
- Department of Chemical Engineering, University of Patras and ICE/HT-FORTH, GR-26500 Patras, Greece, Chemistry Department, Heriot-Watt University Edinburgh, EH14 4AS, United Kingdom, and Laboratoire de Physique des Polymères, CP223, Université Libre de Bruxelles, Boulevard de Triomphe, B-1050 Bruxelles, Belgique
| | - Costas Karatasos
- Department of Chemical Engineering, University of Patras and ICE/HT-FORTH, GR-26500 Patras, Greece, Chemistry Department, Heriot-Watt University Edinburgh, EH14 4AS, United Kingdom, and Laboratoire de Physique des Polymères, CP223, Université Libre de Bruxelles, Boulevard de Triomphe, B-1050 Bruxelles, Belgique
| | - Jean-Paul Ryckaert
- Department of Chemical Engineering, University of Patras and ICE/HT-FORTH, GR-26500 Patras, Greece, Chemistry Department, Heriot-Watt University Edinburgh, EH14 4AS, United Kingdom, and Laboratoire de Physique des Polymères, CP223, Université Libre de Bruxelles, Boulevard de Triomphe, B-1050 Bruxelles, Belgique
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21
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Alamo R, Blanco J, Carrilero I, Fu R. Measurement of the 13C spin–lattice relaxation time of the non-crystalline regions of semicrystalline polymers by a cp MAS-based method. POLYMER 2002. [DOI: 10.1016/s0032-3861(01)00761-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Qiu, Ediger MD. Entanglement Effects in Polyethylene Melts: 13C NMR Relaxation Experiments. Macromolecules 2002. [DOI: 10.1021/ma010597i] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Qiu
- Department of Chemistry, University of WisconsinMadison, Madison, Wisconsin 53706
| | - M. D. Ediger
- Department of Chemistry, University of WisconsinMadison, Madison, Wisconsin 53706
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23
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Lippow SM, Qiu X, Ediger MD. Effect of tacticity on the segmental dynamics of polypropylene melts investigated by 13C nuclear magnetic resonance. J Chem Phys 2001. [DOI: 10.1063/1.1391455] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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24
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Roland CM, Ngai KL, Santangelo PG, Qiu XH, Ediger MD, Plazek DJ. Temperature Dependence of Segmental and Terminal Relaxation in Atactic Polypropylene Melts. Macromolecules 2001. [DOI: 10.1021/ma002121p] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- C. M. Roland
- Naval Research Laboratory, Washington, D.C. 20375-5320; Department of Chemistry, University of WisconsinMadison, Madison, Wisconsin 53706; and Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - K. L. Ngai
- Naval Research Laboratory, Washington, D.C. 20375-5320; Department of Chemistry, University of WisconsinMadison, Madison, Wisconsin 53706; and Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - P. G. Santangelo
- Naval Research Laboratory, Washington, D.C. 20375-5320; Department of Chemistry, University of WisconsinMadison, Madison, Wisconsin 53706; and Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - XH. Qiu
- Naval Research Laboratory, Washington, D.C. 20375-5320; Department of Chemistry, University of WisconsinMadison, Madison, Wisconsin 53706; and Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - M. D. Ediger
- Naval Research Laboratory, Washington, D.C. 20375-5320; Department of Chemistry, University of WisconsinMadison, Madison, Wisconsin 53706; and Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - D. J. Plazek
- Naval Research Laboratory, Washington, D.C. 20375-5320; Department of Chemistry, University of WisconsinMadison, Madison, Wisconsin 53706; and Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
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Min B, Qiu X, Ediger MD, Pitsikalis M, Hadjichristidis N. Component Dynamics in Polyisoprene/Polyvinylethylene Blends Well above Tg. Macromolecules 2001. [DOI: 10.1021/ma0018345] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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26
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RYCKAERT JEANPAUL, ARIALDI GIANLUIGI, MELCHIONNA SIMONE. Molecular dynamics of polymers with explicit but frozen hydrogens. Mol Phys 2001. [DOI: 10.1080/00268970010007280] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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27
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Qiu X, Moe NE, Ediger MD, Fetters LJ. Local and global dynamics of atactic polypropylene melts by multiple field 13C nuclear magnetic resonance. J Chem Phys 2000. [DOI: 10.1063/1.1305889] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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28
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Karali A, Dais P, Heatley F. Carbon-13 Nuclear Magnetic Relaxation Study of Solvent Effects on Chain Local Dynamics of Poly(N-vinylcarbazole) in Dilute Solution. Macromolecules 2000. [DOI: 10.1021/ma000092c] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Aglaia Karali
- Department of Chemistry, University of Crete, 71409 Iraklion, Crete, Greece
| | - Photis Dais
- Department of Chemistry, University of Crete, 71409 Iraklion, Crete, Greece
| | - Frank Heatley
- Department of Chemistry, University of Manchester, Manchester M13 9PL, U.K
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