Orthogonal Click Postfunctionalization of Alternating Copolymers Prepared by Nitroxide-Mediated Polymerization.

Area of Science:

• Polymer Chemistry
• Organic Synthesis
• Materials Science

Background:

• Controlled polymerization techniques are crucial for designing functional polymers.
• Alternating copolymers offer unique properties due to their defined sequences.
• Nitroxide-mediated polymerization (NMP) provides control over polymer architecture.

Purpose of the Study:

• To synthesize alternating copolymers using NMP with specific functional monomers.
• To explore post-polymerization modification strategies for creating dually functionalized polymers.
• To develop water-soluble polymers through ester hydrolysis.

Main Methods:

• Nitroxide-mediated polymerization (NMP) of hexafluoroisopropyl acrylate (HFIPA) and ((6-trimethylsilyl)-hex-5-yn-1-yl)vinyl ether (THVE).
• Characterization using tandem mass spectrometry (MS/MS), 1H and 19F NMR spectroscopy, IR spectroscopy, and gel permeation chromatography (GPC).
• Sequential functionalization via copper-catalyzed azide-alkyne click (CuAAC) and amidation reactions, followed by saponification.

Main Results:

• Successful synthesis of alternating poly(HFIPA-alt-THVE) with confirmed sequence integrity.
• Demonstration of sequential click chemistry and amidation to yield dually functionalized poly(acrylamide-alt-triazole) copolymers.
• Preparation of water-soluble poly(acrylic acid-alt-triazole) via hydrolysis of the HFIP ester groups.

Conclusions:

• NMP is an effective method for producing well-defined alternating copolymers from the chosen monomers.
• The synthesized copolymers can be readily functionalized to create advanced polymeric materials with tailored properties.
• The developed strategy enables the synthesis of water-soluble functional polymers for potential applications.