期刊
AICHE JOURNAL
卷 66, 期 7, 页码 -出版社
WILEY
DOI: 10.1002/aic.16245
关键词
bulk polymerization; CRP; light; molecular weight distribution; ultrasonic agitation
资金
- National Natural Science Foundation of China [21625603, 21961132001]
- Shanghai Jiao Tong University Scientific and Technological Innovation Funds [2019QYB06]
To control over molecular weight and its distribution in bulk controlled radical polymerization (CRP) at high conversion remains a challenge. Currently, there are few reports about bulk CRP regulated by external field. In this work, a new strategy combining external fields of light and ultrasound, namely double-external-field, is reported to overcome the challenge. Light irradiation directly reduces the deactivator (CuBr2)-Br-II/L in the presence of free amine ligand, while ultrasonic agitation improves the homogeneity of the system and moderates the diffusional limitations on activation-deactivation and termination processes. Bulk polymerizations of methyl acrylate (MA) were conducted in a controlled manner at conversion over 90%, producing PMA with low dispersities (D = 1.05-1.07) and good retention of chain-end functionality (77%). In addition, good control over the polymerizations for methyl methacrylate (MMA) and styrene was obtained, although the chain-end functionality of PMMA-Br requires further improvement. It is believed that this as-developed double-external-field regulation strategy is also applicable to other light induced bulk RDRP systems to improve the controllability.
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