Amphiphilic single and double networks: a small-angle X-ray scattering investigation

Xiaohan Zhang, Konstantinos Kyriakos, Maria Rikkou-Kalourkoti, Elina N. Kitiri, Costas S. Patrickios, Christine M. Papadakis

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

We investigated the microphase-separated morphologies of water-swollen amphiphilic single and double polymer networks using small-angle X-ray scattering (SAXS). The networks consist of (i) a first conetwork containing hydrophobic blocks from either 2-ethylhexyl methacrylate (EHMA) or lauryl methacylate (LauMA) and hydrophilic blocks from 2-(dimethylamino)ethyl methacrylate (DMAEMA) and (ii) a second polyacrylamide (PAAm) network. The SAXS curves are modeled by spherical core-shell micelles, where densely packed hydrophobic cores are surrounded by swollen hydrophilic chains. The correlation between these hydrophobic cores is described using a hard-sphere structure factor. A Porod law and an Ornstein-Zernike structure factor are adopted to capture the strong forward scattering due to large-scale inhomogeneities and the correlation between polymer strands, respectively. The size of the hydrophobic cores depends on the degree of polymerization of the hydrophobic block: for medium and long hydrophobic blocks, several hydrophobic cores merge together to form a larger core. When the second PAAm network is present, the nanostructures of the first amphiphilic network are less well-defined.

Original languageEnglish
Pages (from-to)1027-1036
Number of pages10
JournalColloid and Polymer Science
Volume294
Issue number6
DOIs
StatePublished - 1 Jun 2016

Keywords

  • Amphiphilic polymers
  • Double networks
  • Small-angle X-ray scattering

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