%0 Journal Article
%A Gowda, Ravikumar R.
%A Chen, Eugene Y.-X.
%D 2017
%T Supplementary Figures from Chemoselective Lewis pair polymerization of renewable multivinyl-functionalized γ-butyrolactones
%U https://rs.figshare.com/articles/journal_contribution/Supplementary_Figures_from_Chemoselective_Lewis_pair_polymerization_of_renewable_multivinyl-functionalized_i_i_-butyrolactones/5114296
%R 10.6084/m9.figshare.5114296.v1
%2 https://rs.figshare.com/ndownloader/files/8683135
%K Lewis pair polymerization
%K γ-vinyl-γ-methyl-α-methylene-γ-butyrolactone
%K γ-allyl-γ-methyl-α-methylene-γ-butyrolactone
%X Multivinyl-functionalized γ-butyrolactones, γ-vinyl-γ-methyl-α-methylene-γ-butyrolactone (γVMMBL) and γ-allyl-γ-methyl-α-methylene-γ-butyrolactone (γAMMBL), have been synthesized from biorenewable ethyl levulinate and effectively polymerized by Lewis pairs consisting of an organic N-heterocyclic carbene Lewis base and a strong organo-Lewis acid E(C6F5)3 (E = Al, B). This Lewis pair polymerization is quantitatively chemoselective, proceeds exclusively via polyaddition across the conjugated α-methylene double bond without participation of the γ-vinyl or γ-allyl double bond, and produces high molecular weight functionalized polymers with unimodal molecular weight distributions. The Al-based Lewis pair produces the polymer with approximately 5.5 times higher molecular weight than that by the B-based Lewis pair. The resulting vinyl-functionalized polymers are soluble in common organic solvents and stable at room temperature, and can be thermally cured into crosslinked materials.
%I The Royal Society