Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Furo-cho, Chikusa-ku, Nagoya University, Nagoya 464-8603, Japan
satoh@chembio.nagoya-u.ac.jp (K.S.)
kamigait@chembio.nagoya-u.ac.jp (M.K.)
收稿:2018-12-27,
修回:2019-1-22,
录用:2019-1-23,
网络首发:2019-03-04,
纸质出版:2019-09
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Citation: Uchiyama, M.; Sakaguchi, M.; Satoh, K.; Kamigaito, M. A user-friendly living cationic polymerization: Degenerative chain-transfer polymerization of vinyl ethers by simply using mixtures of weak and superstrong protonic acids. Chinese J. Polym. Sci. 2019, 37, 851–857
Mineto Uchiyama, Masataka Sakaguchi, Kotaro Satoh, et al. A User-friendly Living Cationic Polymerization: Degenerative Chain-transfer Polymerization of Vinyl Ethers by Simply Using Mixtures of Weak and Superstrong Protonic Acids[J]. Chinese Journal of Polymer Science, 2019, 37(9): 851-857.
Citation: Uchiyama, M.; Sakaguchi, M.; Satoh, K.; Kamigaito, M. A user-friendly living cationic polymerization: Degenerative chain-transfer polymerization of vinyl ethers by simply using mixtures of weak and superstrong protonic acids. Chinese J. Polym. Sci. 2019, 37, 851–857 DOI: 10.1007/s10118-019-2233-0.
Mineto Uchiyama, Masataka Sakaguchi, Kotaro Satoh, et al. A User-friendly Living Cationic Polymerization: Degenerative Chain-transfer Polymerization of Vinyl Ethers by Simply Using Mixtures of Weak and Superstrong Protonic Acids[J]. Chinese Journal of Polymer Science, 2019, 37(9): 851-857. DOI: 10.1007/s10118-019-2233-0.
Mixtures of a weak protonic acid and a trace amount of superstrong protonic acid were used for the simple control of the cationic polymerization of vinyl ethers
via
a degenerative chain-transfer mechanism
in which the former acid works as a precursor of the chain transfer agent (CTA) or the dormant species and the latter works as a source of the cationic propagating species. The addition of mixtures of phosphoric acid dibutyl ester ((
n
-BuO)
2
PO
2
H) or 1-octanethiol (
n
-C
8
H
17
SH) and a trace amount of trifluoromethanesulfonic acid (TfOH) to a solution of isobutyl vinyl ether (IBVE) at −78 °C resulted in polymers with controlled molecular weights
which were basically determined by the feed ratio of IBVE to the weak protonic acid
and narrow molecular weight distributions (
M
w
/
M
n
≈ 1.1). These results were almost the same as those obtained using their prepared adducts of IBVE as CTAs in the presence of a trace amount of TfOH under similar conditions. Methanesulfonic acid (CH
3
SO
3
H)
whose adduct of IBVE has not been isolated due to instability
was similarly used in conjunction with trace TfOH to result in controlled molecular weights but slightly broader MWDs (
M
w
/
M
n
= 1.2–1.8). These results indicate that the sulfoxonium ion is also an effective intermediate in the cationic DT polymerization in addition to the phosphonium and sulfonium intermediates derived from (
n
-BuO)
2
PO
2
H and
n
-C
8
H
17
SH
respectively. The simple living cationic polymerization was thus achieved by using a combination of a weak protonic acid and a trace amount of TfOH
which are both easily available
low cost
free from metal
and easy to handle
without need for preparation of the initiator.
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