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Detection of Living Anionic Species in Polymerization Reactions Using Hyperpolarized NMR

Title
Detection of Living Anionic Species in Polymerization Reactions Using Hyperpolarized NMR
Author
이영복
Keywords
DYNAMIC NUCLEAR-POLARIZATION; STYRENE POLYMERIZATION; MAGNETIC-RESONANCE; ELECTRON-TRANSFER; ENHANCED NMR; C-13 NMR; POLYMERS; SPECTROSCOPY; POLYSTYRENE; INITIATION
Issue Date
2013-03
Publisher
ACS AMERICAN CHEMICAL SOCIETY
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 권: 135 호: 12, 페이지: 4636-4639
Abstract
Intermediates during the anionic polymerization of styrene were observed using hyperpolarized NMR. Dissolution dynamic nuclear polarization (DNP) of monomers provides a sufficient signal-to-noise ratio for detection of C-13 NMR signals in real time as the reaction progresses. Because of its large chemical shift dispersion, C-13 is well-suited to distinguish and characterize the chemical species that arise during the reaction. At the same time, incorporation of hyperpolarized small-molecule monomers is a unique way to generate polymers that exhibit a transient signal enhancement at the active site. This strategy is applicable despite the decay of the hyperpolarization of the polymer due to rapid spin lattice relaxation. Real-time measurements on polymerization reactions provide both mechanistic and kinetic information without the need for stable isotope labeling of the molecules of interest. These capabilities are orthogonal to currently established methods that separate synthesis and analysis into two steps, making dissolution DNP an attractive method to study polymerization reactions.
URI
https://pubs.acs.org/doi/10.1021/ja4001008http://hdl.handle.net/20.500.11754/44168
ISSN
0002-7863
DOI
10.1021/ja4001008
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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