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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Flexible polyurethane foam nanocomposites with modified layered double hydroxides
https://orcid.org/0000-0001-6471-9215
Abstract A carbonate intercalated Mg/Al layered double hydroxide (LDH-CO3) was subjected to a calcination–rehydration treatment in order to intercalate two different phosphorus containing anions (HPO4 −2 and bis(2-ethylhexyl) phosphate, HDEHP−) into the hydroxide layers. The X-ray diffraction analysis showed that the anions were successfully intercalated presenting different crystallinity degree and crystallite size, being LDH-CO3 the most crystalline, followed by LDH-HDEHP and LDH-HPO4. The effect of the addition of unmodified and modified LDH in different quantities (1, 3 and 5pphp) to a flexible polyurethane foam matrix containing a castor oil based polyether was studied. Depending on the crystallinity of the LDH, different dispersion degree was achieved in the nanocomposites affecting the properties differently. Density and firmness increased with the addition of LDH while lower resilience values were obtained in foams containing 3pphp of LDH-CO3 and LDH-HPO4. In addition, thermal behaviour of nanocomposites was analysed by thermogravimetric analysis (TGA) and pyrolysis flow combustion calorimetry (PCFC) and was compared to the reference foam. A decrease in heat release rate was observed in the second stage of degradation, especially for LDH-HDEHP containing foam.
Graphical abstract Display Omitted
Highlights The XRD analysis showed different crystallinity of the LDH after modification. Properties of the PUF nanocomposites were affected by the dispersion degree of LDH. The LDH increased the thermal stability of the second stage of degradation of PUF.
Flexible polyurethane foam nanocomposites with modified layered double hydroxides
https://orcid.org/0000-0001-6471-9215
Abstract A carbonate intercalated Mg/Al layered double hydroxide (LDH-CO3) was subjected to a calcination–rehydration treatment in order to intercalate two different phosphorus containing anions (HPO4 −2 and bis(2-ethylhexyl) phosphate, HDEHP−) into the hydroxide layers. The X-ray diffraction analysis showed that the anions were successfully intercalated presenting different crystallinity degree and crystallite size, being LDH-CO3 the most crystalline, followed by LDH-HDEHP and LDH-HPO4. The effect of the addition of unmodified and modified LDH in different quantities (1, 3 and 5pphp) to a flexible polyurethane foam matrix containing a castor oil based polyether was studied. Depending on the crystallinity of the LDH, different dispersion degree was achieved in the nanocomposites affecting the properties differently. Density and firmness increased with the addition of LDH while lower resilience values were obtained in foams containing 3pphp of LDH-CO3 and LDH-HPO4. In addition, thermal behaviour of nanocomposites was analysed by thermogravimetric analysis (TGA) and pyrolysis flow combustion calorimetry (PCFC) and was compared to the reference foam. A decrease in heat release rate was observed in the second stage of degradation, especially for LDH-HDEHP containing foam.
Graphical abstract Display Omitted
Highlights The XRD analysis showed different crystallinity of the LDH after modification. Properties of the PUF nanocomposites were affected by the dispersion degree of LDH. The LDH increased the thermal stability of the second stage of degradation of PUF.
Flexible polyurethane foam nanocomposites with modified layered double hydroxides
https://orcid.org/0000-0001-6471-9215
Abstract A carbonate intercalated Mg/Al layered double hydroxide (LDH-CO3) was subjected to a calcination–rehydration treatment in order to intercalate two different phosphorus containing anions (HPO4 −2 and bis(2-ethylhexyl) phosphate, HDEHP−) into the hydroxide layers. The X-ray diffraction analysis showed that the anions were successfully intercalated presenting different crystallinity degree and crystallite size, being LDH-CO3 the most crystalline, followed by LDH-HDEHP and LDH-HPO4. The effect of the addition of unmodified and modified LDH in different quantities (1, 3 and 5pphp) to a flexible polyurethane foam matrix containing a castor oil based polyether was studied. Depending on the crystallinity of the LDH, different dispersion degree was achieved in the nanocomposites affecting the properties differently. Density and firmness increased with the addition of LDH while lower resilience values were obtained in foams containing 3pphp of LDH-CO3 and LDH-HPO4. In addition, thermal behaviour of nanocomposites was analysed by thermogravimetric analysis (TGA) and pyrolysis flow combustion calorimetry (PCFC) and was compared to the reference foam. A decrease in heat release rate was observed in the second stage of degradation, especially for LDH-HDEHP containing foam.
Graphical abstract Display Omitted
Highlights The XRD analysis showed different crystallinity of the LDH after modification. Properties of the PUF nanocomposites were affected by the dispersion degree of LDH. The LDH increased the thermal stability of the second stage of degradation of PUF.
Flexible polyurethane foam nanocomposites with modified layered double hydroxides
Gómez-Fernández, Sandra (Autor:in) / Ugarte, Lorena (Autor:in) / Peña-Rodriguez, Cristina (Autor:in) / Zubitur, Manuela (Autor:in) / Corcuera, M. Ángeles (Autor:in) / Eceiza, Arantxa (Autor:in)
Applied Clay Science ; 123 ; 109-120
15.01.2016
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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