Preparation of monodisperse poly(N-isopropylacrylamide) microgel particles with homogenous cross-link density distribution

Roberta Acciaro, T. Gilányi, Imre Varga

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

Monodisperse microgel latex with homogeneous cross-link density distribution within the particles was prepared by feeding the monomer and cross-linker into the reaction mixture in a regulated way during the polymerization. To determine the appropriate monomer feeding parameters, the kinetics of the particle formation was investigated by HPLC. The swelling and optical characteristics of the prepared homogenously cross-linked microgel particles were compared to the properties of inhomogenously cross-linked microgels prepared by the normal precipitation polymerization method. The distribution of the cross-link density within the particles inserts a great influence on the characteristics of the system. The degree of swelling of the homogeneous particles is significantly higher than that of the heterogeneous microgel particles. Furthermore, at room temperature the pNIPAm latex containing the homogeneously cross-linked particles is transparent, while the heterogeneously cross-linked particles form a highly turbid system at the same 0.1 wt % concentration.

Original languageEnglish
Pages (from-to)7917-7925
Number of pages9
JournalLangmuir
Volume27
Issue number12
DOIs
Publication statusPublished - Jun 21 2011

Fingerprint

Latex
Latexes
Particles (particulate matter)
Swelling
density distribution
Monomers
Polymerization
preparation
Kinetics
latex
swelling
polymerization
monomers
Temperature
poly-N-isopropylacrylamide
inserts
kinetics
room temperature

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

Cite this

Preparation of monodisperse poly(N-isopropylacrylamide) microgel particles with homogenous cross-link density distribution. / Acciaro, Roberta; Gilányi, T.; Varga, Imre.

In: Langmuir, Vol. 27, No. 12, 21.06.2011, p. 7917-7925.

Research output: Contribution to journalArticle

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