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Facile one-pot synthesis and solution behavior of poly(acrylic acid)-block-polycaprolactone copolymers

2018; Elsevier BV; Volume: 273; Linguagem: Inglês

10.1016/j.molliq.2018.10.026

1873-3166

Augusto Gonzaga Oliveira de Freitas, Paulo I. R. Muraro, Tanize Bortolotto, Suelen Gauna Trindade, Vanessa Schmidt, Leonardo Quintana Soares Lopes, Mario D. Ninago, Ángel J. Satti, Andrés E. Ciolino, Marcelo A. Villar, Cristiano Giacomelli,

Polymer Surface Interaction Studies

A metal-free protocol to obtain poly(acrylic acid)-block-polycaprolactone diblock copolymers (PAA-b-PCL) by a one-pot method involving simultaneous Reversible Addition-Fragmentation Chain Transfer (RAFT) and Ring Opening Polymerization (ROP) processes is reported. The strategy is based on the use of diphenyl phosphate (DPP) as catalyst and a bifunctional compound that acts as both chain transfer agent (CTA) in the acrylic acid RAFT polymerization process and co-initiator in the ε-caprolactone (ε-CL) ROP process. PAA-b-PCL diblock copolymers were obtained with near quantitative conversions of both monomers in a relatively short period of time. In aqueous solutions, PAA-b-PCL diblock copolymers self-assembled into pH- and ionic strength- responsive micellar structures.