Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
msjpzhao@scut.edu.cn
收稿:2019-03-26,
修回:2019-4-22,
录用:2019-4-25,
网络首发:2019-06-26,
纸质出版:2019-12
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Jiang, Z. L.; Zhao, J. P.; Zhang, G. Z. Readily prepared and tunable ionic organocatalysts for ring-opening polymerization of lactones. Chinese J. Polym. Sci. 2019, 37, 1205–1214.
Zhuo-Lun Jiang, Jun-Peng Zhao, Guang-Zhao Zhang. Readily Prepared and Tunable Ionic Organocatalysts for Ring-opening Polymerization of Lactones[J]. Chinese Journal of Polymer Science, 2019, 37(12): 1205-1214.
Jiang, Z. L.; Zhao, J. P.; Zhang, G. Z. Readily prepared and tunable ionic organocatalysts for ring-opening polymerization of lactones. Chinese J. Polym. Sci. 2019, 37, 1205–1214. DOI: 10.1007/s10118-019-2285-1.
Zhuo-Lun Jiang, Jun-Peng Zhao, Guang-Zhao Zhang. Readily Prepared and Tunable Ionic Organocatalysts for Ring-opening Polymerization of Lactones[J]. Chinese Journal of Polymer Science, 2019, 37(12): 1205-1214. DOI: 10.1007/s10118-019-2285-1.
Highly potent ionic organocatalyst is developed for room-temperature controlled ring-opening polymerization (ROP) of lactones
including
δ
-valerolactone
ε
-caprolactone
and
δ
-hexalactone. The catalysts are prepared by simply mixing tetra-
n
-butyl ammonium hydroxide and a (thio)urea at elevated temperature under vacuum
and used in cooperation with an alcoholic initiator. The performance of the catalyst is readily adjusted and optimized through variation of the (thio)urea precursor
catalyst composition
and reaction condition. Urea-derived catalysts are generally superior to thiourea-derived ones. Provided with proper
N
-substituents
the catalyst affords both high polymerization efficiency and high selectivity for monomer enchainment over macromolecular transesterification
even at high monomer conversion and/or substantially extended reaction time. In addition to acidity
structural symmetry of the urea also proves decisive for the catalytic activity
which enables a catalyst-assisted proton transfer process for the ring-opening of lactone and thus provides a novel mechanistic insight for ROP catalyzed by hydrogen-bonding type bifunctional ionic organocatalysts.
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