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Homo- and co-polymerization of disubstituted ketenes

Abstract : This study is aimed at synthesizing with a satisfying yield new architectures of high performance polymers, possessing a neat structure and good processing window, on the basis of disubstituted aliphatic or aromatic ketenes. The synthesis of dimethylketene (DMK), methylethylketene (MEK), diethylketene (DEK), ethylphenylketene (EPK) and diphenylketene (DPK) were approached. Then homo and copolymerization of these monomers with different initiators were studied. The influence in steric hindrance of the monomers affected their reactivity. Thus copolymers based on DMK/ DEK and DMK / DPK were successfully obtained and afforded polyketones having good thermal properties and processing window (Tm ~ 160°C and Td₅% ~ 260°C). Only DMK homopolymerized by classic cationic initiation. Photopolymerization did not lead to any polymer formation. Initiation with metallocenes polymerized DMK to a crystallized polyester in an insertion chain growth mechanism. Excellent properties (Mn ~300 000 g·mol−1, Tg ~ 70°C, Tm ~ 200°C, Td₅% ~ 330°C) were obtained.
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Submitted on : Friday, September 27, 2019 - 2:43:09 PM
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  • HAL Id : tel-02299103, version 1

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Bo Jiang. Homo- and co-polymerization of disubstituted ketenes. Polymers. Normandie Université, 2019. English. ⟨NNT : 2019NORMIR02⟩. ⟨tel-02299103⟩

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