Controlled Synthesis of Block Copolymers containing N-isopropylacrylamide by Reversible Addition-Fragmentation Chain-Transfer (RAFT) Polymerization
DOI:
https://doi.org/10.29356/jmcs.v55i1.848Keywords:
Block Copolymer, RAFT, poly(NIPAAm), poly(MMA), poly(HEMA), poly(St).Abstract
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 copolymer 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)-bpoly(NIPAAm) with a polydispersity index (IPD) of 1.20 by RAFT.
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