Adjustable crystalline stereocomplexes from enantiopure gradient polycarbonates

Stereoselective interaction was observed in the mixture of enantiopure gradient polycarbonate（denoted as PCOPC-g-PCPC, originated from the enantioselective terpolymerization of CO2, 3,4-epoxytetrahydrofuran（COPO） and cyclopentene oxide（CPO）） and various isotactic polycarbonates with opposite configu...

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Bibliographic Details
Published in:Science China. Chemistry 2016-11, Vol.59 (11), p.1415-1420
Main Authors: Liu, Ye, He, Keke, Ren, Weimin, Li, Rongrong, Lu, Xiaobing
Format: Article
Language:English
Subjects:
Carbon dioxide
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Chloroform
Copolymers
Cyclopentene
Enantiomers
Physical properties
Polycarbonate resins
Segments
Stereocomplexes
Stereoselectivity
Terpolymerization
Terpolymers
Thermal stability
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Summary:Stereoselective interaction was observed in the mixture of enantiopure gradient polycarbonate（denoted as PCOPC-g-PCPC, originated from the enantioselective terpolymerization of CO2, 3,4-epoxytetrahydrofuran（COPO） and cyclopentene oxide（CPO）） and various isotactic polycarbonates with opposite configuration in chloroform solution. The resultant crystalline stereocomplexes exhibit enhanced thermal stability and new crystalline behaviors, significantly distinct from their parent polymers. It was found that the cocrystallization selectively occurred between（R）-PCOPC（CO_2/COPO copolymer） and（S）-PCOPC-enriched segment in the gradient terpolymer（S）-PCOPC-g-PCPC, while（R）-PCPC（CO_2/CPO copolymer） selectively complexed with（S）-PCPC-enriched segment. No stereocomplexation was observed between（S）-PCOPC-g-PCPC and（S）-PCOPC or（S）-PCPC. This study is beneficial to finding new routes to prepare various semicrystalline materials having a wide variety of physical properties and degradability.
ISSN:1674-7291
1869-1870
DOI:10.1007/s11426-016-0212-1