Resumo

VEGA-RIOS, Alejandro  e  LICEA-CLAVERIE, Angel. Controlled Synthesis of Block Copolymers containing N-isopropylacrylamide by Reversible Addition-Fragmentation Chain-Transfer (RAFT) Polymerization. J. Mex. Chem. Soc [online]. 2011, vol.55, n.1, pp.21-32. ISSN 1870-249X.

Synthesis of diblock copolymers of N-isopropylacrylamide with n-hexyl acrylate, styrene, methyl methacrylate and 2-hydroxyethyl methacrylate, were carried out by using a sequential "living" polymerization method in the presence of chain transfer agent (CTA) 4-Cyano-4-(phenylcarbonothioylthio)pentanoic acid. The block copo-lymer composition and molecular weight could be well controlled while maintaining a narrow molecular weight distribution. The block copolymers were characterized by ¹H NMR, GPC with MALLS detection and DSC. The molar ratio CTA/Initiator rather than the sequence of monomer addition is the key parameter for achieving the desired materials. We report the first synthesis of poly(HEMA)-b-poly(NIPAAm) with a polydispersity index (IPD) of 1.20 by RAFT.

Palavras-chave : Block Copolymer; RAFT; poly(NIPAAm); poly(MMA); poly(HEMA); poly(St).