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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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Andreozzi L, Autiero C, Faetti M, Giordano M, Zulli F. Dynamic crossovers and activated regimes in a narrow distribution poly(n-butyl acrylate): an ESR study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2006; 18:6481-6492. [PMID: 21690848 DOI: 10.1088/0953-8984/18/28/004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The rotational dynamics of the spin probe cholestane dissolved in a narrow distribution poly(n-butyl acrylate) sample has been investigated via electron spin resonance (ESR) spectroscopy. The measurements were carried out in a wide temperature range: different dynamic regions have been recognized, and the coupling of the probe dynamics to the α and secondary relaxations has been revealed. In particular, the coupling with the structural relaxation is ruled by two fractionary Vogel-Fulcher laws (VF). The crossover from one VF region to the other occurs at the temperature T(C) = 1.17T(g), signalling the onset of the cooperativity in the dynamics and confirming a behaviour previously observed in ESR studies carried out on polymeric glass-formers. Furthermore, in this work we discuss the activated regime at the highest temperatures and show that the activation energy does not depend on the length of the polymer main- and side-chains, while its onset temperature linearly depends on the chain length.
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Bartoš J, Bandžuch P, Šauša O, Krištiaková K, Krištiak J, Kanaya T, Jenninger W. Free Volume Microstructure and Its Relationship to the Chain Dynamics in cis-1,4-Poly(butadiene) As Seen by Positron Annihilation Lifetime Spectroscopy. Macromolecules 1997. [DOI: 10.1021/ma961512u] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J. Bartoš
- Polymer Institute of the Slovak Academy of Sciences, SK-842 36 Bratislava, Slovak Republic, Institute of Physics of the Slovak Academy of Sciences, SK-842 28 Bratislava, Slovak Republic, Institute for Chemical Research, Kyoto University, Uji 611, Japan, and Deutsches Kunststoff-Institut, Schlossgartenstrasse 6, D-642 89 Darmstadt, Germany
| | - P. Bandžuch
- Polymer Institute of the Slovak Academy of Sciences, SK-842 36 Bratislava, Slovak Republic, Institute of Physics of the Slovak Academy of Sciences, SK-842 28 Bratislava, Slovak Republic, Institute for Chemical Research, Kyoto University, Uji 611, Japan, and Deutsches Kunststoff-Institut, Schlossgartenstrasse 6, D-642 89 Darmstadt, Germany
| | - O. Šauša
- Polymer Institute of the Slovak Academy of Sciences, SK-842 36 Bratislava, Slovak Republic, Institute of Physics of the Slovak Academy of Sciences, SK-842 28 Bratislava, Slovak Republic, Institute for Chemical Research, Kyoto University, Uji 611, Japan, and Deutsches Kunststoff-Institut, Schlossgartenstrasse 6, D-642 89 Darmstadt, Germany
| | - K. Krištiaková
- Polymer Institute of the Slovak Academy of Sciences, SK-842 36 Bratislava, Slovak Republic, Institute of Physics of the Slovak Academy of Sciences, SK-842 28 Bratislava, Slovak Republic, Institute for Chemical Research, Kyoto University, Uji 611, Japan, and Deutsches Kunststoff-Institut, Schlossgartenstrasse 6, D-642 89 Darmstadt, Germany
| | - J. Krištiak
- Polymer Institute of the Slovak Academy of Sciences, SK-842 36 Bratislava, Slovak Republic, Institute of Physics of the Slovak Academy of Sciences, SK-842 28 Bratislava, Slovak Republic, Institute for Chemical Research, Kyoto University, Uji 611, Japan, and Deutsches Kunststoff-Institut, Schlossgartenstrasse 6, D-642 89 Darmstadt, Germany
| | - T. Kanaya
- Polymer Institute of the Slovak Academy of Sciences, SK-842 36 Bratislava, Slovak Republic, Institute of Physics of the Slovak Academy of Sciences, SK-842 28 Bratislava, Slovak Republic, Institute for Chemical Research, Kyoto University, Uji 611, Japan, and Deutsches Kunststoff-Institut, Schlossgartenstrasse 6, D-642 89 Darmstadt, Germany
| | - W. Jenninger
- Polymer Institute of the Slovak Academy of Sciences, SK-842 36 Bratislava, Slovak Republic, Institute of Physics of the Slovak Academy of Sciences, SK-842 28 Bratislava, Slovak Republic, Institute for Chemical Research, Kyoto University, Uji 611, Japan, and Deutsches Kunststoff-Institut, Schlossgartenstrasse 6, D-642 89 Darmstadt, Germany
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