One-pot syntheses of heterotelechelic α-vinyl,ω-methoxysilane polyethylenes and condensation into comb-like and star-like polymers with high chain end functionality

• Published in: Polymer chemistry Vol. 11; no. 23; pp. 3884 - 3891
• Main Authors: Khedaioui, Douriya, Burcher, Benjamin, Gajan, David, Montarnal, Damien, D'Agosto, Franck, Boisson, Christophe
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 17.06.2020; Royal Society of Chemistry - RSC
• Subjects: Acetic acid; Chain transfer; Chemical Sciences; Condensation polymerization; Crystal structure; Crystallinity; Deactivation; Magnesium; Material chemistry; Oligomers; Polyethylenes; Polymer chemistry; Reagents; Toluene
• ISSN: 1759-9954; 1759-9962
• DOI: 10.1039/d0py00638f

A one-pot synthesis method for various α-vinyl,ω-methoxysilyl polyethylene oligomers with well-defined lengths and high end-group functionalities and crystallinities is presented. This method relies on the combination of catalyzed chain growth of ethylene in the presence of a di(alkenyl)magnesium chain transfer agent and a neodymocene complex, followed by efficient deactivation using a variety of silane reagents: trimethoxymethylsilane, trimethoxyvinylsilane and tetramethoxysilane. Further condensation of the ω-methoxysilyl groups of these polymers in active medium (toluene/acetic acid mixture) leads to complex architectures such as comb-like structures or star-like structures that combine high vinyl functionality at extremities with a high crystallinity. Crystalline and functional comb-like and star-like polyethylene architectures.