Stability analysis of tannin-based foams using multiple light-scattering measurements. (February 2017)

• Record Type: Journal Article
• Authors: Delgado-Sánchez, C.; Fierro, V.; Li, S.; Pasc, A.; Pizzi, A.; Celzard, A.
• Is Part Of: European polymer journal. Volume 87(2017:Feb.)
• Page Start: 318
• Page End: 330
• Publication Date: 2017-02
• Subjects: Tannin -- Thermoset -- Destabilisation -- Foaming capacity -- Multiple light scattering -- Optical analyser; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; Polymerization; Polymers; Periodicals; Electronic journals; 547.705
• DOI: 10.1016/j.eurpolymj.2016.12.036
• Languages: English
• ISSNs: 0014-3057

Abstract

Graphical abstract: Highlights: Thermoset, tannin-based liquid foams were investigated with by multiple-light scattering. Destabilisation phenomena could be separated and investigated independently. Average cell size could be monitored as a function of time and temperature. Optimising formulations/processes becomes possible for producing rigid polymer foams. Abstract: Liquid foams were prepared by whipping aqueous solutions based on natural polyphenols, surfactant and crosslinker. The destabilisation mechanisms of such thick, opaque and viscous liquid foams were investigated for the first time with a light-scattering detection method using an optical analyser. The technique allowed separating processes such as drainage, coalescence and coarsening, and sedimentation, so that each of them could be investigated independently as a function of whipping time, surfactant amount, and temperature. The corresponding average bubble diameters could also be determined as a function of time. It was shown that this kind of optical analysis is quite relevant for optimising formulations and foaming conditions with the aim of recovering rigid foams after polymerisation, having a given homogeneous structure that might be useful for various applications such as thermal insulation or acoustic absorption.