Polyurethane-polyhedral oligomeric silsesquioxanes nanostructured hybrid dispersions by the prepolymer mixing process

Samy Madbouly, Joshua U. Otaigbe, Ajaya K. Nanda, Douglas A. Wicks

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Waterborne nanostructured polyurethane with reactive polyhedral oligomeric silsesquioxanes (POSS) hybrid dispersions were synthesized via environmentally-friendly aqueous dispersion through the prepolymer mixing process. To improve the distribution of the POSS monomer in the polyurethane aminoethylaminopropylisobutyl polyhedral oligomeric silsesquioxane was first prereacted with excess isophorone diisocyanate in N-methylpyrrolidone. After this reaction the process was continued by reaction with poly(hexylene adipate - isophthalate) diol, dimethylol propionic acid, and hexamethylene diamine. Dispersion of the polymer was accomplished with triethyl amine as the neutralizing base. The particle size and viscosity of the dispersions were not affected by POSS loading. The resulting polyurethane dispersions did show evidence of some phase inhomogeneity as evidenced by wide angle X-ray diffraction patterns of cast films. Although the incorporation of the POSS monomers did not have a significant effect on the dispersion's properties; the physical properties of the isolated polymers films did display significant changes, with notable increases in storage modulus, Tg, and complex viscosity. POSS was found to react strongly with only the hard segments of PU (urethane segments), while the soft segment was not affected by the presence of POSS. This experimental fact was confirmed by the increase in the Tg of the hard segments with increasing concentration of POSS as measured by DMA.

Original languageEnglish (US)
Title of host publicationNanotechnology Applications in Coatings
PublisherAmerican Chemical Society
Pages36-50
Number of pages15
ISBN (Print)9780841274488
DOIs
StatePublished - Jun 12 2009

Publication series

NameACS Symposium Series
Volume1008
ISSN (Print)0097-6156
ISSN (Electronic)1947-5918

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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