Syndiospecific Coordination Polymerization of Si‐H‐Containing Styrenes Catalyzed by Scandium Complex and Synthesis of Styrene‐Based Triblock Copolymers
| Autor: | Jing Wang, Hui Yu, Hui Niu, Ke Yang, Jinghan Dong, Yang Li, Jialin Yu |
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| Rok vydání: | 2019 |
| Předmět: |
Polymers and Plastics
Polymers Hydrosilylation Organic Chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Polymerization Styrenes 0104 chemical sciences Styrene chemistry.chemical_compound Monomer chemistry Tacticity Polymer chemistry Materials Chemistry Copolymer Polystyrenes Coordination polymerization Polystyrene 0210 nano-technology |
| Zdroj: | Macromolecular Rapid Communications. 40:1900048 |
| ISSN: | 1521-3927 1022-1336 |
| Popis: | The controlled syndiospecific polymerization of three Si-H-containing styrenes, that is, 4-(methylhydrosilyl)styrene (FSt-1), 4-(dimethylhydrosilyl)styrene (FSt-2) and 4-(diisopropylhydrosilyl)styrene (FSt-3), is realized in the presence of (C5 Me4 SiMe3 )Sc (CH2 C6 H5 )2 (THF)/[Ph3 C][B(C6 F5 )4 ]. Then a series of FSt-b-styrene-b-FSt triblock copolymers (FSt-St-FSt) are synthesized facilely via a sequential monomer feeding process (FSt-2, styrene, and FSt-2, respectively) during the polymerization. The syndiotactic polystyrene (sPS) block in the middle endows the copolymer with high melting point above 250 °C, whereas the Si-H groups on monomer FSt-2 introduce functional pendants to the end-blocks (with Si-H content of 31-63 mol%). Finally by a mild and high-effective hydrosilylation reaction, novel polar-group functionalized sPS is obtained. |
| Databáze: | OpenAIRE |
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