Synthesis of Hyperbranched Polymers with Pendent Norbornene Functionalities via RAFT Polymerization of a Novel Asymmetrical Divinyl Monomer
Data(s) |
2009
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Resumo |
Hyperbranched polymers with numerous pendent norbornene functionalities have been synthesized via the radical polymerization of a novel asymmetrical divinyl monomer hearing a higher reactivity methacrylate group and it lower reactivity norbornene group. Mediated by a rapid reversible addition-fragmentation chain transfer (RAFT) equilibrium, the concentration of polymeric chain radicals is decreased, and thus the gelation did not occur until higher monomer conversions (ca. 90%). An increase in reaction temperature call also significantly promote the formation of the hyperbranched structure owing to the decreased stability of the intermediate radicals derived from the norbornene group, which was confirmed by a model copolymerization system of two single vinyl monomers with similar structures to the vinyl groups in the asymmetrical divinyl monomer. Furthermore, Tri-SEC and conventional Sin-SEC as well as H-1 NMR. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Dong ZM;Liu XH;Tang XL;Li YS.Synthesis of Hyperbranched Polymers with Pendent Norbornene Functionalities via RAFT Polymerization of a Novel Asymmetrical Divinyl Monomer,MACROMOLECULES ,2009,42(13):4596-4603 |
Palavras-Chave | #FRAGMENTATION CHAIN TRANSFER #FREE-RADICAL POLYMERIZATION #LIVING ANIONIC-POLYMERIZATION #ALLYL METHACRYLATE #BLOCK-COPOLYMERS #POLY(ALLYL METHACRYLATE) #BIFUNCTIONAL MONOMER #METHYL-METHACRYLATE #MOLECULAR-WEIGHT #VINYL-POLYMERS |
Tipo |
期刊论文 |