Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 32, Pages 13633-13637Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202005806
Keywords
copolymerization; polymers; epoxides; structure elucidation; synthetic methods
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Funding
- National Natural Science Foundation of China (NSFC) [21722402, 21674015]
- National Science Foundation (US) [CHE-1665258]
- Robert A. Welch Foundation [A-0923]
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Topological polymers possess many advantages over linear polymers. However, when it comes to the poly(monothiocarbonate)s, no topological polymers have been reported. Described herein is a facile and efficient approach for synthesizing well-defined branched poly(monothiocarbonate)s in a grafting through manner by copolymerizing carbonyl sulfide (COS) with epichlorohydrin (ECH), where the side-chain forms in situ. The lengths of the side-chains are tunable based on reaction temperatures. More importantly, enhancement in thermal properties of the branched copolymer was observed, as the T-g value increased by 22 degrees C, compared to the linear analogues. When chiral ECH was utilized, semicrystalline branched poly(monothiocarbonate)s were accessible with a T-m value of 112 degrees C, which is 40 degrees C higher than that of the corresponding linear poly(monothiocarbonate)s. The strategy presented herein for synthesizing branched polymers provides efficient and concise access to topological polymers.
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