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- Title
Unravelling Main- and Side-Chain Motions in Polymers with NMR Spectroscopy and Relaxometry: The Case of Polyvinyl Butyral.
- Authors
Calucci, Lucia; Pizzanelli, Silvia; Mandoli, Alessandro; Birczyński, Artur; Lalowicz, Zdzisław T.; De Monte, Cristina; Ricci, Lucia; Bronco, Simona
- Abstract
Polyvinyl butyral (PVB) is an amorphous polymer employed in many technological applications. In order to highlight the relationships between macroscopic properties and dynamics at a microscopic level, motions of the main-chain and of the propyl side-chains were investigated between Tg − 288 °C and Tg + 55 °C, with Tg indicating the glass transition temperature. To this aim, a combination of solid state Nuclear Magnetic Resonance (NMR) methods was applied to two purposely synthesized PVB isotopomers: one fully protonated and the other perdeuterated on the side-chains. 1H time domain NMR and 1H field cycling NMR relaxometry experiments, performed across and above Tg, revealed that the dynamics of the main-chain corresponds to the α-relaxation associated to the glass transition, which was previously characterized by dielectric spectroscopy. A faster secondary relaxation was observed for the first time and ascribed to side-chains. The geometry and rate of motions of the different groups in the side-chains were characterized below Tg by 2H NMR spectroscopy.
- Subjects
POLYVINYL butyral; NUCLEAR magnetic resonance spectroscopy; GLASS transition temperature; GLASS transitions; NUCLEAR magnetic resonance; POLYMERS; POLYMER liquid crystals
- Publication
Polymers (20734360), 2021, Vol 13, Issue 16, p2686
- ISSN
2073-4360
- Publication type
Article
- DOI
10.3390/polym13162686