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Solid‐State NMR Investigations of the Unusual Effects Resulting from the Nanoconfinement of Water within Amphiphilic Crosslinked Polymer Networks
Author(s) -
Ohashi Ryutaro,
Bartels Jeremy W.,
Xu Jinqi,
Wooley Karen L.,
Schaefer Jacob
Publication year - 2009
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200900846
Subject(s) - materials science , magic angle spinning , spinning , solid state nuclear magnetic resonance , spin diffusion , polymer , ethylene glycol , fluoropolymer , contact angle , amphiphile , phase (matter) , peg ratio , chemical engineering , nuclear magnetic resonance spectroscopy , polymer chemistry , diffusion , nuclear magnetic resonance , composite material , copolymer , organic chemistry , thermodynamics , chemistry , physics , finance , economics , engineering
Two types of solid‐state 19 F NMR spectroscopy experiments are used to characterize phase‐separated hyperbranched fluoropolymer–poly(ethylene glycol) (HBFP–PEG) crosslinked networks. Mobile (soft) domains are detected in the HBFP phase by a rotor‐synchronized Hahn echo under magic‐angle spinning conditions, and rigid (hard) domains by a solid echo with no magic‐angle spinning. The mobility of chains is detected in the PEG phase by 1 H → 13 C cross‐polarization transfers with 1 H spin‐lock filters with and without magic‐angle spinning. The interface between HBFP and PEG phases is detected by a third experiment, which utilized a 19 F → 1 H–(spin diffusion)– 1 H → 13 C double transfer with 13 C solid‐echo detection. The results of these experiments show that composition‐dependent PEG inclusions in the HBFP glass rigidify on hydration, consistent with an increase in macroscopic tensile strength.