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A Combined Atomic and Molecular Probe Characterization of Aromatic Hydrocarbons via PALS and ESR: Methylbenzene. MATERIALS 2022; 15:ma15020462. [PMID: 35057182 PMCID: PMC8777640 DOI: 10.3390/ma15020462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 12/27/2021] [Accepted: 01/05/2022] [Indexed: 01/27/2023]
Abstract
A combined study of one of the simplest aromatic hydrocarbons, i.e., methylbenzene (toluene) (TOL), via the annihilation of an ortho-positronium (o-Ps) probe via positron annihilation lifetime spectroscopy (PALS) and the rotation dynamics of nitroxide spin probe 2,2,6,6-tetramethyl-piperidinyl-1-oxy (TEMPO) using electron spin resonance (ESR) over a wide temperature range, 10–300 K, is reported. The o-Ps lifetime, τ3, and the relative o-Ps intensity, I3, as a function of temperature exhibit changes defining several characteristic PALS temperatures in the slowly and rapidly cooled samples. Similarly, the spectral parameter of TEMPO mobility in TOL, 2Azz‘, and its correlation time, τc, reveal several effects at a set of the characteristic ESR temperatures, which were determined and compared with the PALS results. Finally, the physical origins of the changes in free volume expansion and spin probe mobility are revealed. They are reflected in a series of the mutual coincidences between the characteristic PALS and ESR temperatures and appropriate complementary thermodynamic and dynamic techniques.
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Švajdlenková H, Šauša O, Adichtchev SV, Surovtsev NV, Novikov VN, Bartoš J. On the Mutual Relationships between Molecular Probe Mobility and Free Volume and Polymer Dynamics in Organic Glass Formers: cis-1,4-poly(isoprene). Polymers (Basel) 2021; 13:polym13020294. [PMID: 33477605 PMCID: PMC7831304 DOI: 10.3390/polym13020294] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/08/2021] [Accepted: 01/11/2021] [Indexed: 11/16/2022] Open
Abstract
We report on the reorientation dynamics of small spin probe 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO) in cis-1,4-poly(isoprene) (cis-1,4-PIP10k) from electron spin resonance (ESR) and the free volume of cis-1,4-PIP10k from positron annihilation lifetime spectroscopy (PALS) in relation to the high-frequency relaxations of cis-1,4-PIP10k using light scattering (LS) as well as to the slow and fast processes from broadband dielectric spectroscopy (BDS) and neutron scattering (NS). The hyperfine coupling constant, 2Azz
'(T), and the correlation times, τ
c(T), of cis-1,4-PIP10k/TEMPO system as a function of temperature exhibit several regions of the distinct spin probe TEMPO dynamics over a wide temperature range from 100 K up to 350 K. The characteristic ESR temperatures of changes in the spin probe dynamics in cis-1,4-PIP10k/TEMPO system are closely related to the characteristic PALS ones reflecting changes in the free volume expansion from PALS measurement. Finally, the time scales of the slow and fast dynamics of TEMPO in cis-1,4-PIP10k are compared with all of the six known slow and fast relaxation modes from BDS, LS and NS techniques with the aim to discuss the controlling factors of the spin probe reorientation mobility in polymer, oligomer and small molecular organic glass-formers.
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Affiliation(s)
- Helena Švajdlenková
- Polymer Institute of SAS, Dúbravská Cesta 9, 84541 Bratislava, Slovakia;
- Correspondence:
| | - Ondrej Šauša
- Institute of Physics of SAS, Dúbravská Cesta 9, 84511 Bratislava, Slovakia;
- Department of Nuclear Chemistry, Faculty of Natural Sciences, Comenius University, Mlynska Dolina, Ilkovicova 6, 84215 Bratislava, Slovakia
| | - Sergey V. Adichtchev
- IA&E, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (S.V.A.); (N.V.S.); (V.N.N.)
| | - Nikolay V. Surovtsev
- IA&E, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (S.V.A.); (N.V.S.); (V.N.N.)
- Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Vladimir N. Novikov
- IA&E, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (S.V.A.); (N.V.S.); (V.N.N.)
| | - Josef Bartoš
- Polymer Institute of SAS, Dúbravská Cesta 9, 84541 Bratislava, Slovakia;
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Siracusa V, Karpova S, Olkhov A, Zhulkina A, Kosenko R, Iordanskii A. Gas Transport Phenomena and Polymer Dynamics in PHB/PLA Blend Films as Potential Packaging Materials. Polymers (Basel) 2020; 12:polym12030647. [PMID: 32178319 PMCID: PMC7182844 DOI: 10.3390/polym12030647] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 03/10/2020] [Accepted: 03/10/2020] [Indexed: 12/19/2022] Open
Abstract
Actually, in order to replace traditional fossil-based polymers, many efforts are devoted to the design and development of new and high-performance bioplastics materials. Poly(hydroxy alkanoates) (PHAS) as well as polylactides are the main candidates as naturally derived polymers. The intention of the present study is to manufacture fully bio-based blends based on two polyesters: poly (3-hydroxybutyrate) (PHB) and polylactic acid (PLA) as real competitors that could be used to replace petrol polymers in packaging industry. Blends in the shape of films have been prepared by chloroform solvent cast solution methodology, at different PHB/PLA ratios: 1/0, 1/9, 3/7, 5/5, 0/1. A series of dynamic explorations have been performed in order to characterize them from a different point of view. Gas permeability to N2, O2, and CO2 gases and probe (TEMPO) electron spin resonance (ESR) analyses were performed. Blend surface morphology has been evaluated by Scanning Electron Microscopy (SEM) while their thermal behavior was analyzed by Differential Scanning Calorimetry (DSC) technique. Special attention was devoted to color and transparency estimation. Both probe rotation mobility and N2, O2, and CO2 permeation have monotonically decreased during the transition from PLA to PHB, for all contents of bio-blends, namely because of transferring from PLA with lower crystallinity to PHB with a higher one. Consequently, the role of the crystallinity was elucidated. The temperature dependences for CO2 permeability and diffusivity as well as for probe correlation time allowed the authors to evaluate the activation energy of both processes. The values of gas transport energy activation and TEMPO rotation mobility are substantially close to each other, which should testify that polymer segmental mobility determines the gas permeability modality.
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Affiliation(s)
- Valentina Siracusa
- Department of Chemical Science (DSC), University of Catania, Viale A. Doria 6, 95125 Catania, Italy
- Correspondence: ; Tel.: +39-3387275526
| | - Svetlana Karpova
- Plekhanov Russian University of Economics, Stremyanny per. 36, 117997 Moscow, Russian Federation; (S.K.); (A.O.)
| | - Anatoliy Olkhov
- Plekhanov Russian University of Economics, Stremyanny per. 36, 117997 Moscow, Russian Federation; (S.K.); (A.O.)
- Semenov Institute of Chemical Physics, Kosygin str. 4, 119991 Moscow, Russian Federation; (A.Z.); (R.K.); (A.I.)
| | - Anna Zhulkina
- Semenov Institute of Chemical Physics, Kosygin str. 4, 119991 Moscow, Russian Federation; (A.Z.); (R.K.); (A.I.)
| | - Regina Kosenko
- Semenov Institute of Chemical Physics, Kosygin str. 4, 119991 Moscow, Russian Federation; (A.Z.); (R.K.); (A.I.)
| | - Alexey Iordanskii
- Semenov Institute of Chemical Physics, Kosygin str. 4, 119991 Moscow, Russian Federation; (A.Z.); (R.K.); (A.I.)
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Bartoš J, Švajdlenková H, Šauša O. Molecular probe dynamics and free volume heterogeneities in n-propanol confined in a regular MCM-41 matrix by ESR and PALS. RSC Adv 2020; 10:2283-2294. [PMID: 35494603 PMCID: PMC9048748 DOI: 10.1039/c9ra09495d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 12/17/2019] [Indexed: 11/21/2022] Open
Abstract
A combined investigation of the spin probe TEMPO mobility and the free volume holes in n-propanol (n-PrOH) confined in a regular virgin MCM-41 matrix by means of ESR or PALS techniques, respectively, is reported. Dynamics of spin probe TEMPO alters at several characteristic ESR temperatures which are close to the characteristic PALS ones reflecting the changes in o-Ps annihilation and the related free volume. Correlations between these characteristic ESR and PALS temperatures indicate the common physical origins of the respective changes in the free volume expansion and the TEMPO mobility in the confined liquid n-PrOH. The significant difference in dynamic heterogeneity of TEMPO after confinement and free volume dispersion reflect the strongly altered structural-dynamic relationships in the confined n-PrOH medium with respect to the bulk situation.
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Affiliation(s)
- Josef Bartoš
- Polymer Institute of SAS Dúbravská Cesta 9 SK-845 41 Bratislava Slovakia
| | | | - Ondrej Šauša
- Institute of Physics of SAS Dúbravská Cesta 9 SK-845 11 Bratislava Slovakia
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Araujo S, Delpouve N, Domenek S, Guinault A, Golovchak R, Szatanik R, Ingram A, Fauchard C, Delbreilh L, Dargent E. Cooperativity Scaling and Free Volume in Plasticized Polylactide. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00464] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Steven Araujo
- Normandie Univ, UNIROUEN Normandie, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France
- CEREMA, Direction territoriale Normandie Centre, 76120 Grand-Quevilly, France
| | - Nicolas Delpouve
- Normandie Univ, UNIROUEN Normandie, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France
| | - Sandra Domenek
- UMR Ingénierie Procédés Aliments, AgroParisTech, INRA, Université de Saclay, 1 Avenue des Olympiades, F-91744 Massy Cedex, France
| | - Alain Guinault
- Laboratoire PIMM, Ensam, CNRS, Cnam, 151 Boulevard de l’Hôpital, 75013 Paris, France
| | - Roman Golovchak
- Department of Physics and Astronomy, Austin Peay State University, Clarksville, Tennessee 37044 United States
| | - Roman Szatanik
- Institute of Physics, Opole University, Opole PL-45052, Poland
| | - Adam Ingram
- Faculty of Physics, Opole University of Technology, Opole PL-45370, Poland
| | - Cyrille Fauchard
- CEREMA, Direction territoriale Normandie Centre, 76120 Grand-Quevilly, France
| | - Laurent Delbreilh
- Normandie Univ, UNIROUEN Normandie, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France
| | - Eric Dargent
- Normandie Univ, UNIROUEN Normandie, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France
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