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Physical Properties of Polymers

Structural studies of thermally stable, combustion-resistant polymer composites

Abstract

Composites of the industrially important polymer, poly(methyl methacrylate) (PMMA), were prepared by free-radical polymerization of MMA with varying amounts (1–30 wt. %) of sodium dioctylsulfosuccinate (Aerosol OT or AOT) surfactant added to the reaction mixture. The composites with AOT incorporated show enhanced resistance to thermal degradation compared to pure PMMA homopolymer, and micro-cone combustion calorimetry measurements also show that the composites are combustion-resistant. The physical properties of the polymers, particularly at low concentrations of surfactant, are not significantly modified by the incorporation of AOT, whereas the degradation is modified considerably for even the smallest concentration of AOT (1 wt. %). Structural analyses over very different lengthscales were performed. X-ray scattering was used to determine nm-scale structure, and scanning electron microscopy was used to determine μm-scale structure. Two self-assembled species were observed: large phase-separated regions of AOT using electron microscopy and regions of hexagonally packed rods of AOT using X-ray scattering. Therefore, the combustion resistance is observed whenever AOT self-assembles. These results demonstrate a promising method of physically incorporating a small organic molecule to obtain a highly thermally stable and combustion-resistant material without significantly changing the properties of the polymer.

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Acknowledgements

GNS was funded by a CASE PhD studentship (Merck Chemicals Ltd. UK, an affiliate of Merck KGaA, Darmstadt, Germany and the UK Engineering and Physical Sciences Research Council EPSRC). The Ganesha X-ray scattering apparatus used for this research was purchased under EPSRC Grant ‘Atoms to Applications’ Grant ref. EP/K035746/1. This work benefited from the use of the SasView application, originally developed under NSF Award DMR-0520547. SasView also contains code developed with funding from the EU Horizon 2020 programme under the SINE2020 project Grant No 654000. Mr Jonathan Jones (Electron and Scanning Probe Microscopy Facility, University of Bristol) is acknowledged for SEM images and EDX analysis.

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Correspondence to Gregory N Smith.

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Smith, G., Hallett, J., Joseph, P. et al. Structural studies of thermally stable, combustion-resistant polymer composites. Polym J 49, 711–719 (2017). https://doi.org/10.1038/pj.2017.44

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