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Article Dans Une Revue Colloid and Polymer Science Année : 2023

Quantitative investigation of the pore size–reducing effect of perfluorocarbons in polyurethane foaming

Martin Hamann
Sébastien Andrieux
Markus Schütte
  • Fonction : Auteur
Daniel Telkemeyer
  • Fonction : Auteur
Meik Ranft
  • Fonction : Auteur
Wiebke Drenckhan-Andreatta

Résumé

Despite the long-standing use of per-and polyfluorinated carbons (FCs) as pore size-reducing agents for polyurethane rigid (PUR) foams, their mechanisms of action remain poorly understood. To shed light on these mechanisms, we provide a quantitative analysis of the influence of the FC concentration on the pore size of PUR cup foams of two different model PUR foam systems: an industrially-relevant "technical system" and a simplified "scientific system." Combining scanning electron microscopy (SEM) and the PORE!SCAN method, we provide a detailed analysis of the pore size distributions of the obtained foams. We confirm that the characteristic pore size of both systems is indeed significantly reduced by adding small quantities of FC. However, we show that there seems to exist a critical FC concentration (about 3 wt.% with respect to the A-component) beyond which adding more FC has a negligible effect. More interestingly, the relative extent of the pore size reduction is almost identical for both PUR foam systems and the normalized pore size distributions remain largely unchanged over the whole range of FC concentrations. Our findings suggest that the FC-driven pore size reduction is a general effect caused by distinct mechanisms that are independent of the choice of the PUR foam system. Moreover, we hypothesize that this effect is not to be searched for during foam aging, as often reported, but during the pre-mixing step.
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hal-04283693 , version 1 (14-11-2023)

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Martin Hamann, Sébastien Andrieux, Markus Schütte, Daniel Telkemeyer, Meik Ranft, et al.. Quantitative investigation of the pore size–reducing effect of perfluorocarbons in polyurethane foaming. Colloid and Polymer Science, 2023, 301 (7), pp.763-773. ⟨10.1007/s00396-023-05107-z⟩. ⟨hal-04283693⟩
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