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In-situ understanding of pore nucleation and growth in polyurethane foams by using real-time synchrotron X-ray tomography

Pérez-Tamarit, S.; Solórzano, E.; Mokso, R. LU and Rodríguez-Pérez, M. A. (2019) In Polymer 166. p.50-54
Abstract

The nucleation and growth of pores in PU foams have been visualized and quantified for the first time in 4D using in-situ tomographic microscopy. Acquiring sequences of 3D images in 156 ms each, we describe homogeneous and heterogeneous nucleation and subsequent bubble growth dynamics for materials with and without nucleating nanoparticles. Exploiting the time resolved tomographic sequences we obtained the bubble nucleation rate, bubble density and size evolution, based on which the diffusion coefficient of gas molecules in polymer can be calculated, evidencing the reduction of diffusivity provoked by the inclusion of nanoparticles. We found that nucleation and growth are in a large extend decoupled in time.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
4D imaging, Foaming, Polyurethane, Porous polymers, Synchrotron tomography
in
Polymer
volume
166
pages
5 pages
publisher
Elsevier
external identifiers
  • scopus:85060349428
ISSN
0032-3861
DOI
10.1016/j.polymer.2019.01.049
language
English
LU publication?
yes
id
ee344600-0092-4747-8f4b-185ba6f7df9a
date added to LUP
2019-01-31 11:42:22
date last changed
2019-02-27 05:11:38
@article{ee344600-0092-4747-8f4b-185ba6f7df9a,
  abstract     = {<p>The nucleation and growth of pores in PU foams have been visualized and quantified for the first time in 4D using in-situ tomographic microscopy. Acquiring sequences of 3D images in 156 ms each, we describe homogeneous and heterogeneous nucleation and subsequent bubble growth dynamics for materials with and without nucleating nanoparticles. Exploiting the time resolved tomographic sequences we obtained the bubble nucleation rate, bubble density and size evolution, based on which the diffusion coefficient of gas molecules in polymer can be calculated, evidencing the reduction of diffusivity provoked by the inclusion of nanoparticles. We found that nucleation and growth are in a large extend decoupled in time.</p>},
  author       = {Pérez-Tamarit, S. and Solórzano, E. and Mokso, R. and Rodríguez-Pérez, M. A.},
  issn         = {0032-3861},
  keyword      = {4D imaging,Foaming,Polyurethane,Porous polymers,Synchrotron tomography},
  language     = {eng},
  pages        = {50--54},
  publisher    = {Elsevier},
  series       = {Polymer},
  title        = {In-situ understanding of pore nucleation and growth in polyurethane foams by using real-time synchrotron X-ray tomography},
  url          = {http://dx.doi.org/10.1016/j.polymer.2019.01.049},
  volume       = {166},
  year         = {2019},
}