Synthesis and characterization of poly(dimethylsiloxaneurethane) nanocomposites: Effect of (in)completely condensed silsesquioxanes on thermal, morphological, and mechanical properties

K. Madhavan, D. Gnanasekaran, B. S R Reddy

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The structural properties of completely condensed and incompletely condensed silsesquioxane in the polyurethane nanocomposites containing 17.5 wt % of silsesquioxane was investigated by FTIR, TGA, scanning electron microscopy (SEM), X-ray diffraction (XRD), and DMA techniques. FTIR spectra shows the existence of hydrogen bonding in the PU-POSS system. The intensity of hydrogen bonding decreases with the increase in POSSH loading suggesting the prevention of the formation of hydrogen bonding by the addition of POSS-H molecule. SEM analysis reveals the incompatibility of POSS-H molecule in the PU matrices exhibiting greater extent of phase separation and a large number of POSS aggregates on the addition of POSS-H molecule in the PU-POSS matrices. The TGA thermograms show that the POSS-PU hybrids possess excellent thermal stabilities. However, the incorporation of POSS-H molecule leads to a decrease in the thermal properties and only the char yield values increase with the increase in the POSS-H content in the PU-POSS hybrids. The XRD pattern reveals that the crystalline structure of POSS molecules are destroyed by the polymer matrices in the PU-POSS hybrid films. The decrease in the bending storage modulus E′ values with the increase in the POSS-H content proves the retardation of hydrogen bonding formation by the POSS-H molecule in the PUPOSS hybrid.

Original languageEnglish (US)
Pages (from-to)3659-3667
Number of pages9
JournalJournal of Applied Polymer Science
Volume114
Issue number6
DOIs
StatePublished - Dec 15 2009
Externally publishedYes

Keywords

  • Mechanical
  • Morphology
  • Nanocomposites
  • Polyurethane
  • Thermal

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics
  • Surfaces, Coatings and Films
  • Chemistry(all)

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