Synthesis of Hyperbranched Poly(aryl ether)s via Carbene Insertion Processes
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文摘
Homopolymerization of alkylarylcarbenes derived from diazirine monomers that featured benzylalcohol or phenol residues was found to lead to the production of soluble hyperbranched poly(aryl ether)s. Thepolymerization process was influenced by the solvents employed, monomer concentration, and the reaction time.An increase in the monomer concentration and reaction time was found to lead to an increase in the molecularweight characteristics of the resulting polymers as determined by gel permeation chromatography (GPC). Thecomposition and architecture of the polyethers were determined by nuclear magnetic resonance (NMR)spectroscopic analysis and were found to be highly complex and dependent on the structure of the monomersused. All of the polymers were found to contain ether linkages formed via carbene insertion into O-H bonds,although polymers derived from phenolic carbenes also contained linkages arising from C-alkylation.

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