Crystalline Polythiocarbonate from Stereoregular Copolymerization of Carbonyl Sulfide and Epichlorohydrin
| Autor: | Wei-Min Ren, Tian-Jun Yue, Zhao-Qian Wan, Ye Liu, Xiao-Bing Lu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Polymers and Plastics
Chemistry Organic Chemistry Regioselectivity 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Bifunctional catalyst Inorganic Chemistry chemistry.chemical_compound Nucleophile Polymer chemistry Materials Chemistry Copolymer Organic chemistry Thiocarbonate Epichlorohydrin 0210 nano-technology Carbonyl sulfide |
| Zdroj: | Macromolecules. 49:2971-2976 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.6b00272 |
| Popis: | Carbonyl sulfide (COS) as a carbon source for copolymerization with epoxides has recently received some attention. The introduction of sulfur atom can provide enhancement of important polymer properties compared to the corresponding copolymer from CO2. However, the synthesized copolymers are all amorphous, therefore hindering them to be used as structural materials. Herein, we report the synthesis and characterization of semicrystalline poly(thiocarbonate)s derived from enantiopure epichlorohydrin and COS employing the single-site bifunctional catalyst. The catalyst shows excellent regioselectivity for epichlorohydrin ring-opening at methylene carbon. The copolymerization mechanism has been studied by means of NMR and ESI-MS methods. It is found the reaction temperature plays an important role in the crystallization behavior of the resultant copolymers. That is, at ambient temperature the propagating monothiocarboxylate species favors the nucleophilic attack at the chloromethylene of epichlorohydrin to fo... |
| Databáze: | OpenAIRE |
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