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- Title
Quantitatively Probing Cross-Termination in RAFT Polymerization by an Externally Applied Magnetic Field.
- Authors
Lv, Ling; Zhou, Jian; Zou, Gang; Zhang, Qijin
- Abstract
Cross-termination in bulk reversible addition-fragmentation chain transfer (RAFT) polymerization is characterized by defining a new parameter, RM, in terms of the polymerization rates with and without an externally applied magnetic field (EAMF). For the bulk RAFT polymerization (RAFTP) of styrene (St), mediated by (2-cyano-2-propyl)dithiobenzoate (CPDB) and S-1-dodecyl-S′-(α, α′-dimethyl-α′′-acetic acid)trithiocarbonate (DDMAT), an RM of 0.534 and 0.382 is obtained respectively, showing a sensible dependence on the RAFT agent. It is also found that RM has a close relationship with the strength of the EAMF and the concentration of the RAFT agent. Detailed discussion reveals that RM can be used as a characteristic parameter to measure the extent of cross-termination in RAFTP. The experimental technique offers an efficient way to quantitatively probe the cross-termination in situ, and sheds light on the mechanism of RAFTP.
- Subjects
CHAIN transfer (Chemistry); ADDITION polymerization; MAGNETIC fields; ACETIC acid; CHAIN initiation (Chemistry)
- Publication
Macromolecular Chemistry & Physics, 2015, Vol 216, Issue 6, p614
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201400531