Slow motion in [ring-fluoro]polycarbonate by CODEX

Chain dynamics in [ring-fluoro]polycarbonate (an A-B alternating copolymer that has a single fluorine substituent on every fourth main chain ring) have been characterized by centerband only detection of exchange (CODEX) and rotating-frame ¹³C spin-lattice relaxation. The slow motions detected by COD...

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Veröffentlicht in:	Journal of polymer science. Part B, Polymer physics Polymer physics, 2008-06, Vol.46 (11), p.1062-1066
Hauptverfasser:	Weldeghiorghis, Thomas K, Stueber, Dirk, Schaefer, Jacob
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Exact sciences and technology mechanical properties molecular dynamics NMR Organic polymers Physicochemistry of polymers polycarbonates Properties and characterization Structure, morphology and analysis
Online-Zugang:	Volltext
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Beschreibung
Zusammenfassung:	Chain dynamics in [ring-fluoro]polycarbonate (an A-B alternating copolymer that has a single fluorine substituent on every fourth main chain ring) have been characterized by centerband only detection of exchange (CODEX) and rotating-frame ¹³C spin-lattice relaxation. The slow motions detected by CODEX are facilitated by a mechanically active lattice reorganization that permits a flip of the fluorinated ring about its C₂ axis. Nonfluorinated rings undergo small-amplitude reorientations and C₂ flips, both of which are fast and not CODEX active.
ISSN:	0887-6266 1099-0488
DOI:	10.1002/polb.21439