Indexed by:
期刊论文
First Author:
Liu, Ye
Correspondence Author:
Lu, XB (reprint author), Dalian Univ Technol, State Key Lab Fine Chem, Dalian 116024, Peoples R China.
Co-author:
Ren, Wei-Min,Wang, Meng,Liu, Chuang,Lu, Xiao-Bing
Date of Publication:
2015-02-09
Journal:
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Included Journals:
SCIE、EI、PubMed、Scopus
Document Type:
J
Volume:
54
Issue:
7
Page Number:
2241-2244
ISSN No.:
1433-7851
Key Words:
carbon dioxide; crystalline; enantiopure polycarbonates; epoxides;
polymer stereocomplexes
Abstract:
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.
Translation or Not:
no
