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Updated: May 30, 2025

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
Published on: October 10, 2016
Amphiphilic Poly(β-Myrcene-co-Acrylic Acid) Copolymers Synthesized by Nitroxide-Mediated Copolymerization as
Safae Azekriti1, Karim Mehenaoui1, Francis Ehrenfeld1
1Université de Pau et des Pays de l'Adour, CNRS, UMR 5254, IPREM, 2 av. P. Angot, Pau, Pau F-64053, France.
Abstract:
Terpene-based amphiphilic copolymers have been designed as biobased stabilizers for waterborne latex synthesized by miniemulsion or emulsion polymerization of 1,3-diene terpene monomers. The pH-responsive P(AA-co-My) amphiphilic copolymers were synthesized by nitroxide-mediated radical copolymerization of β-myrcene (My) and acrylic acid (AA) with reactivity ratios of rMy = 0.24 ± 0.06 and rAA = 0.05 ± 0.10. Polymerization was controlled for My-rich monomer feed ratios (fMy,0 > 0.3). Though AA NMP exhibited reasonable control, a low fraction of My (fMy,0 ≤ 0.3) produced branched structures with higher molar masses. P(AA0.80-co-My0.20) was the most efficient copolymer to stabilize monomodal PMy latexes (Dh ∼ 150-350 nm) synthesized by miniemulsion or emulsion polymerization. P(AA-co-My) copolymers with a higher hydrophobic PMy fraction (>35 mol %) were less efficient stabilizers. The more hydrophobic β-farnesene monomer was successfully polymerized by miniemulsion polymerization, whereas emulsion polymerization failed. The biobased waterborne latexes are pH-responsive with pH-triggered flocculation at low pH.
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