Jump to main content
Jump to site search

Issue 44, 2012
Previous Article Next Article

In situ evidence of the nanoparticle nucleating effect in polyurethane–nanoclay foamed systems

Author affiliations

Abstract

This paper presents a comparative study on the nanoadditives (nanoclays) effect during the foaming process of rigid polyurethane (PU) foams. A non-standard technique, high-resolution microfocus X-ray radioscopy, has been applied for the first time on these materials to study the mechanisms (nucleation and coalescence) occurring during the reactive foaming process. Using this technique in combination with image analysis it has been possible to determine the evolution of density and cell size throughout the whole foaming process. Thus, cell density values have been calculated from the beginning of the expansion and, using the cell density data, it has been possible to demonstrate that nucleation at initial foaming stages strongly dominates over the coalescence mechanism – not observed – in the nanocomposite systems under study. These results confirm the theories assuming that nanoparticles act as heterogeneous nucleation sites for this type of materials, which were not undoubtedly confirmed via ex situ studies.

Graphical abstract: In situ evidence of the nanoparticle nucleating effect in polyurethane–nanoclay foamed systems

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Apr 2012, accepted on 09 Aug 2012 and first published on 11 Sep 2012


Article type: Paper
DOI: 10.1039/C2SM25983D
Citation: Soft Matter, 2012,8, 11262-11270
  •   Request permissions

    In situ evidence of the nanoparticle nucleating effect in polyurethane–nanoclay foamed systems

    S. Pardo-Alonso, E. Solórzano, S. Estravís, M. A. Rodríguez-Perez and J. A. de Saja, Soft Matter, 2012, 8, 11262
    DOI: 10.1039/C2SM25983D

Search articles by author

Spotlight

Advertisements