期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 134, 期 42, 页码 17739-17745出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja307976c
关键词
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资金
- National Science Foundation of USA [CHE 1057743]
- Robert A. Welch Foundation [A-0923]
- National Natural Science Foundation of China (NSFC) [21134002, 21104007]
- National Basic Research Program of China (973 Program) [2009CB825300]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1057743] Funding Source: National Science Foundation
Selective transformation of carbon dioxide and epoxides into degradable polycarbonates (CO2-based copolymer) has been regarded as a most promising green polymerization process. Although tremendous progress has been made during the past decade, very few successful examples have been reported to synthesize well-defined block copolymers to expand the scope of these green copolymers. Herein, we report a tandem strategy combining two living polymerization techniques, salenCo(III)X-catalyzed styrene oxide SO/CO2 copolymerization and ring-opening polymerization of lactide with DBU (1,8-diazabicyclo[5.4.0]undec-7-ene), for the synthesis of poly(styrene carbonate-block-lactide) copolymers. The key to the success of this tandem strategy is the judicious choice of water as the chain transfer and/or chain terminator reagent, which is added at the end of the salenCo(III)X-catalyzed SO/CO2 copolymerization to in situ generate hydroxyl groups at the end of the polymer chains. The resulting polycarbonates with -OH end groups can thus be directly used as macroinitiators to subsequently initiate ring opening polymerization of lac-fide to synthesize the diblock copolymers. Because of the living polymerization nature of both steps in this tandem strategy, we have demonstrated that the diblock copolymers synthesized possess well-defined structures with narrow molecular weight distributions and controllable lengths of both styrene carbonate and lactide blocks.
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