An investigation of the morphology of Langmuir films based on molecular polyimide brushes containing magnetite nanoparticles

S. A. Klimova, O. A. Inozemtseva, S. V. German, D. A. Gorin, D. M. Ilgach, T. K. Meleshko, A. V. Yakimansky

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Molecular brushes having a polyimide (PI) backbone with degree of polycondensation n = 33 and polymethylmethacrylate (PMMA) side chains with two different degrees of polymerization (m = 63 and m = 114) were synthesized by the method of controlled atom transfer radical polymerization. Hydrophobic magnetite nanoparticles of a size of 18 ± 2 nm were prepared. Langmuir monolayers on the basis of the polyimide brushes and composite monolayers, containing magnetite nanoparticles with a hydrophobic surface, were formed at the water/air interface. It is found that, in the condensed state of the monolayer at the surface pressure values from 25 to 40 mN/m, the limiting surface area A0 per side chain of a brush grows with an increase in the length of PMMA side chains of polymer brushes almost by a factor of 2: from A0 = 744 ± 64 Å2 for PI-graft-PMMA-63 to A0 = 1644 ± 50 Å2 for PI-graft-PMMA-114. Increasing the magnetite solution aliquot mixed with the polymer brush solution at the ratios from 1 : 2 and 1 : 1 to 2 : 1 leads to a rise in the limiting surface area values A0 to 1072 ± 59 Å2 for the first two ratios to 2534 ± 79 Å2 for the third one. The obtained monolayers were transferred onto mica by the Langmuir-Schaeffer method at different surface pressure values (0.5, 10, and 25 mN/m). With the use of the method of atomic force microscopy, it is shown that a four- to sixfold increase in the mean roughness of a composite film surface due to the inclusion of magnetite nanoparticles into the polymer brush monolayer is typical of all samples.

Original languageEnglish
Pages (from-to)396-406
Number of pages11
JournalProtection of Metals and Physical Chemistry of Surfaces
Volume51
Issue number3
DOIs
Publication statusPublished - 1 May 2015
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Metals and Alloys
  • Surfaces, Coatings and Films

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