Crystalline Stereocomplexed Polycarbonates: Hydrogen-Bond-Driven Interlocked Orderly Assembly of the Opposite Enantiomers
发表时间：2019-03-09
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- 论文类型：
- 期刊论文
- 第一作者：
- Liu, Ye
- 通讯作者：
- Lu, XB (reprint author), Dalian Univ Technol, State Key Lab Fine Chem, Dalian 116024, Peoples R China.
- 合写作者：
- Ren, Wei-Min,Wang, Meng,Liu, Chuang,Lu, Xiao-Bing
- 发表时间：
- 2015-02-09
- 发表刊物：
- ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
- 收录刊物：
- SCIE、EI、PubMed、Scopus
- 文献类型：
- J
- 卷号：
- 54
- 期号：
- 7
- 页面范围：
- 2241-2244
- ISSN号：
- 1433-7851
- 关键字：
- carbon dioxide; crystalline; enantiopure polycarbonates; epoxides; polymer stereocomplexes
- 摘要：
- Four novel crystalline stereocomplexed polymers are formed by mixing isotactic (R)- and (S)-polycarbonates in 1:1 mass ratio. They show the enhanced thermal stability and new crystalline behavior, significantly distinct from the component enantiomer. Two stereocomplexed CO2-based polycarbonates from meso-3,4-epoxytetrahydrofuran and 4,4-dimethyl-3,5,8-trioxabicyclo[5.1.0]octane have high melting temperatures of up to 300 degrees C, about 30 degrees C higher than the individual enantiomers. Isotactic (R)- or (S)-poly(cyclopentene carbonate) and poly(cis-2,3-butene carbonate) are typical amorphous polymeric materials, however, upon mixing both enantiomers together, a strong interlocked interaction between polymer chains of opposite configuration occurs, affording the crystalline stereocomplexes with melting temperatures of about 200 degrees C and 180 degrees C, respectively. A DFT study suggests that the driving force forming the stereocomplex is the hydrogen-bonding between carbonate units of the opposite enantiomers.
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- 否
