Mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam).

Mikko Karesoja, Jason McKee, Erno Karjalainen, Sami Hietala, Lotta Bergman, Mika Linden, Heikki Tenhu (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

29 Citations (Scopus)

Abstract

Mesoporous silica particles were grafted with thermoresponsive poly(ethyleneoxide-b-N-vinylcaprolactam), PEO-b-PVCL. N-vinylcaprolactam was first polymd. on particle surfaces using surface initiated atom transfer radical polymn. (SI-ATRP) and then, the poly(ethyleneoxide) blocks were attached to the PVCL chain ends with click chem. The sizes, thermoresponsiviness, and colloidal stability of SiO2-PVCL and SiO2-PVCL-b-PEO particles and their aq. dispersions were studied by SEM, turbidimetry, dynamic light scattering, zeta sizer, and microcalorimetry. The phase sepn. temp. of the PEO-b-PVCL grafted particles did not considerably differ from that of the SiO2-PVCL particles. The zeta potential of the grafted particles was close to zero at room temp. but decreased strongly upon heating. The decrease is related to the collapse of the PVCL blocks and correspondingly, the exposure of the silica surface toward the aq. phase. The colloidal stability of the particles could be enhanced by adding PEO blocks to the chain ends of the PVCL grafts. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013. [on SciFinder(R)]
Original languageEnglish
Pages (from-to)5012-5020
Number of pages9
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume51
Issue number23
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

Keywords

  • Polymerization (atom transfer
  • radical
  • surface initiated
  • mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam))
  • Polyoxyalkylenes Role: POF (Polymer in formulation)
  • PRP (Properties)
  • SPN (Synthetic preparation)
  • PREP (Preparation)
  • USES (Uses) (block
  • diblock
  • Click chemistry
  • Dispersion of materials
  • Mesoporous materials
  • Particle shape
  • Particles
  • Phase separation
  • Phase transition enthalpy
  • Polymer brushes
  • Polymer chains
  • Zeta potential (mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam))
  • Polyoxyalkylenes Role: RCT (Reactant)
  • RACT (Reactant or reagent) (mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam))
  • Polymer morphology (phase
  • mesoporous
  • silica
  • particle
  • grafted
  • poly
  • ethyleneoxide
  • vinyl
  • caprolactam

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