Synthesis of degradable model networks via ATRP and click chemistry. 2006

Jeremiah A Johnson, and Danielle R Lewis, and David D Díaz, and M G Finn, and Jeffrey T Koberstein, and Nicholas J Turro
Department of Chemistry, Columbia University, 3000 Broadway, MC3157, New York, New York 10027, USA.

A simple scheme involving atom transfer radical polymerization (ATRP) from a bifunctional initiator, conversion of the bromine end groups of the resulting telechelic polymer to azides, and cross-linking of this azido-telechelic macromonomer with multi-acetylene functionalized small molecules via copper-catalyzed azide-alkyne cycloaddition was employed to prepare the first tert-butyl acrylate model networks. This general scheme is wide in scope, enabling synthesis of model networks possessing defined pore size from any monomer polymerizable by ATRP. Introduction of an olefin moiety into the ATRP initiator enabled degradation of the materials by ozonolysis to yield star polymer products bearing three or four arms depending on which cross-linker was employed in the parent network. Size-exclusion chromatography of the ozonolysis products confirmed the pore size of the parent network and yielded insight into the number of unreacted functionalities. Model networks derived from a trifunctional alkyne were found to be more completely cross-linked than those derived from a tetrafunctional alkyne, presumably due to less steric hindrance in the former system.

UI MeSH Term Description Entries
D011073 Polyamines Amine compounds that consist of carbon chains or rings containing two or more primary amino groups. Polyamine
D011108 Polymers Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds. These compounds often form large macromolecules (e.g., BIOPOLYMERS; PLASTICS). Polymer
D000179 Acrylates Derivatives of acrylic acid (the structural formula CH2
D000480 Alkynes Hydrocarbons with at least one triple bond in the linear portion, of the general formula Cn-H2n-2. Acetylenic Compounds,Alkyne,Acetylenes
D001386 Azides Organic or inorganic compounds that contain the -N3 group. Azide
D047028 Macrocyclic Compounds Cyclic compounds with a ring size of approximately 1-4 dozen atoms. Macrocycle Compounds,Spherands,Torands,Compounds, Macrocycle,Compounds, Macrocyclic

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