Synthesis and characterization of silica-graft-polystyrene hybrid nanoparticles: Effect of constraint on the glass-transition temperature of spherical polymer brushes

Daniel A. Savin, Dong-Chul Pyun, Gary D. Patterson, Tomasz Kowalewski, Krzysztof Matyjaszewski

Research output: Contribution to journalArticle

147 Citations (Scopus)

Abstract

The effect of the chain constraint on the glass-transition temperature of polystyrene (pS) was studied in the context of polymer tethering to curved surfaces. The synthesis and characterization of silica-graft-polystyrene (SiO2-g-pS) hybrid nanoparticles is reported. Silica nanoparticles possessing covalently bound pS chains were prepared by the atom transfer radical polymerization of styrene from functionalized colloidal surfaces. These hybrid nanoparticles serve as interesting examples of spherical polymer brushes, as a high density of grafted pS was achieved on the inorganic colloid. The confirmation of a brushlike extension of immobilized chains in a good solvent was obtained with dynamic light scattering in toluene of SiO2-g-pS colloids possessing various molar masses of tethered pS. The solid-state morphology of SiO2-g-pS ultrathin films was assessed with transmission electron microscopy, and this confirmed that the silica colloids were well-dispersed in a matrix of the tethered polymer. Differential scanning calorimetry was used to study the effects of tethering and chain immobilization on the glass-transition temperature of pS. The measured glass-transition temperature of annealed bulk films of the hybrid nanoparticles was elevated with respect to the value for pure bulk pS. The enhancements ranged from 13 to 2 K for SiO2-g-pS brushes possessing tethered pS with number-average molecular weights of 5230 and 32,670 g/mol, respectively.

Original languageEnglish (US)
Pages (from-to)2667-2676
Number of pages10
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume40
Issue number23
DOIs
StatePublished - Dec 1 2002
Externally publishedYes

Fingerprint

Polystyrenes
brushes
Brushes
Grafts
Silicon Dioxide
glass transition temperature
polystyrene
Polymers
Silica
Nanoparticles
silicon dioxide
nanoparticles
polymers
synthesis
Colloids
tethering
colloids
Glass transition temperature
Styrene
curved surfaces

Keywords

  • ATRP
  • Colloids
  • Glass transition
  • Light scattering
  • Nanocomposites
  • Polystyrene

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

Cite this

Synthesis and characterization of silica-graft-polystyrene hybrid nanoparticles : Effect of constraint on the glass-transition temperature of spherical polymer brushes. / Savin, Daniel A.; Pyun, Dong-Chul; Patterson, Gary D.; Kowalewski, Tomasz; Matyjaszewski, Krzysztof.

In: Journal of Polymer Science, Part B: Polymer Physics, Vol. 40, No. 23, 01.12.2002, p. 2667-2676.

Research output: Contribution to journalArticle

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