Synthesis and solution properties of a temperature-responsive PNIPAM–b-PDMS–b-PNIPAM triblock copolymer

Michael Cook, Sergey K Filippov, Vitaliy V. Khutoryanskiy

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
34 Downloads (Pure)

Abstract

In this paper, we report the synthesis and self-assembly of a novel thermoresponsive PNIPAM60–b-PDMS70–b-PNIPAM60 triblock copolymer in aqueous solution. The copolymer used a commercially available precursor modified with an atom transfer radical polymerization (ATRP) initiator to produce an ABA triblock copolymer via ATRP. Small-angle neutron scattering (SANS) was used to shed light on the structures of nanoparticles formed in aqueous solutions of this copolymer at two temperatures, 25 and 40 °C. The poly(dimethylsiloxane) block is very hydrophobic and poly(N-isopropylacrylamide) (PNIPAM) is thermoresponsive. SANS data at 25 °C indicates that the solutions of PNIPAM–b-PDMS–b-PNIPAM copolymers form well-defined aggregates with presumably core–shell structures below cloud point temperature. The scattering curves originating from nanoparticles formed at 40 °C in 100% D2O or 100% H2O were successfully fitted with the Beaucage model describing aggregates with hierarchical structure.
Original languageEnglish
Pages (from-to)1351-1358
Number of pages9
JournalColloid and Polymer Science
Volume295
Issue number8
Early online date5 Apr 2017
DOIs
Publication statusPublished - 31 Aug 2017

Keywords

  • thermoresponsive
  • PNIPAM
  • SANS
  • Polymerization
  • Atom transfer radical polymerization (ATRP)
  • self-assembly

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