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Flame retardancy of rigid polyurethane foams containing thermoregulating microcapsules with phosphazene-based monomers

Szczotok, Anna M. ; Madsen, Dan LU orcid ; Serrano, Angel ; Carmona, Manuel ; Van Hees, Patrick LU ; Rodriguez, Juan F. and Kjøniksen, Anna Lena (2021) In Journal of Materials Science 56(2). p.1172-1188
Abstract

Abstract: Thermoregulating microcapsules (MC) with flame-retardant properties were used to produce polyurethane (PU) foams. Thermogravimetric analyses of the microcapsules performed under atmospheric air and nitrogen confirmed that the hexa(methacryloylethylenedioxy) cyclotriphosphazene (PNC-HEMA) monomer raised the amount of residue after exposure to high temperature, proving the formation of a thermally stable char layer. Additionally, the flame-retardant properties of the microcapsules were analyzed by micro-combustion calorimetry (MCC), and the PU foams were tested by both MCC and cone calorimetry. The total heat release and maximum heat release rate were lower for microcapsules containing the flame-retardant PNC-HEMA. The... (More)

Abstract: Thermoregulating microcapsules (MC) with flame-retardant properties were used to produce polyurethane (PU) foams. Thermogravimetric analyses of the microcapsules performed under atmospheric air and nitrogen confirmed that the hexa(methacryloylethylenedioxy) cyclotriphosphazene (PNC-HEMA) monomer raised the amount of residue after exposure to high temperature, proving the formation of a thermally stable char layer. Additionally, the flame-retardant properties of the microcapsules were analyzed by micro-combustion calorimetry (MCC), and the PU foams were tested by both MCC and cone calorimetry. The total heat release and maximum heat release rate were lower for microcapsules containing the flame-retardant PNC-HEMA. The composition of the microcapsules has been proved by MCC and TGA, where the release of the encapsulated phase change material (PCM) occurred at the expected temperature. However, in PU foams, the release of PCM is shifted to higher temperatures. Accordingly, these materials can be considered as an important alternative to commonly used microcapsules containing phase PCMs, where a lower flammability is required for their future application. Graphic abstract: [Figure not available: see fulltext.]

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Materials Science
volume
56
issue
2
pages
17 pages
publisher
Springer
external identifiers
  • scopus:85092564168
ISSN
0022-2461
DOI
10.1007/s10853-020-05389-6
language
English
LU publication?
yes
id
b990dcd7-0a6d-4f8f-921b-f4f7203cb41b
date added to LUP
2020-11-04 10:22:42
date last changed
2022-04-19 01:37:21
@article{b990dcd7-0a6d-4f8f-921b-f4f7203cb41b,
  abstract     = {{<p>Abstract: Thermoregulating microcapsules (MC) with flame-retardant properties were used to produce polyurethane (PU) foams. Thermogravimetric analyses of the microcapsules performed under atmospheric air and nitrogen confirmed that the hexa(methacryloylethylenedioxy) cyclotriphosphazene (PNC-HEMA) monomer raised the amount of residue after exposure to high temperature, proving the formation of a thermally stable char layer. Additionally, the flame-retardant properties of the microcapsules were analyzed by micro-combustion calorimetry (MCC), and the PU foams were tested by both MCC and cone calorimetry. The total heat release and maximum heat release rate were lower for microcapsules containing the flame-retardant PNC-HEMA. The composition of the microcapsules has been proved by MCC and TGA, where the release of the encapsulated phase change material (PCM) occurred at the expected temperature. However, in PU foams, the release of PCM is shifted to higher temperatures. Accordingly, these materials can be considered as an important alternative to commonly used microcapsules containing phase PCMs, where a lower flammability is required for their future application. Graphic abstract: [Figure not available: see fulltext.]</p>}},
  author       = {{Szczotok, Anna M. and Madsen, Dan and Serrano, Angel and Carmona, Manuel and Van Hees, Patrick and Rodriguez, Juan F. and Kjøniksen, Anna Lena}},
  issn         = {{0022-2461}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{1172--1188}},
  publisher    = {{Springer}},
  series       = {{Journal of Materials Science}},
  title        = {{Flame retardancy of rigid polyurethane foams containing thermoregulating microcapsules with phosphazene-based monomers}},
  url          = {{http://dx.doi.org/10.1007/s10853-020-05389-6}},
  doi          = {{10.1007/s10853-020-05389-6}},
  volume       = {{56}},
  year         = {{2021}},
}