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Evaluation of the thermal degradation and cone calorimeter parameters of an intumescent composite containing acidic montmorillonites

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Abstract

This work evaluates the effects of the acidity of montmorillonites on the thermal degradation process and in the cone calorimeter parameters of an intumescent composite constituted by polypropylene, ammonium polyphosphate (APP) and pentaerythritol (PER). The cone calorimeter tests showed that the absence of moderate-strength acidic sites is related to the increase in the peak of heat release rate. The composites were burnt at different key-temperatures and the residues were submitted to Fourier transform infrared spectroscopy, Solid State Nuclear Magnetic Resonance Spectroscopy and to X-ray diffraction. The results showed that the addition of the clay minerals is important to preserve the char at higher temperatures (over 430 °C) and that an excess of Brønsted sites over the Lewis ones with moderate-strength could lead to the increase of the esterification reactions between PER and APP. Besides, the addition of the clay minerals did not affect the mechanical properties of the composites.

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Acknowledgements

We gratefully acknowledge support of the SCT—COAM (CETEM/UFRJ), LIP (IQ/UFRJ) and the Solid State NMR Laboratory (IQ/UFRJ) in providing XRD, solid-state FTIR analyses and solid-state NMR analysis, respectively.

Funding

This work was supported by CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) [001]. The authors thank CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) [307924/2019-0], FAPERJ (Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro) [E-26/202.939/2017, E-26/201.861/2019 and E-26/010.002270/2019], and INOMAT (Instituto Nacional de Ciência e Tecnologia em Materiais Complexos Funcionais) [CNPq 465452/2014-0] for financial support.

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Authors and Affiliations

  1. Instituto de Química, Universidade Federal do Rio de Janeiro, Cidade Universitária, CT, Bloco A, Rio de Janeiro, RJ, 21941-909, Brazil

    Raíssa Carvalho Martins, Simone Pereira da Silva Ribeiro, Michelle Jakeline Cunha Rezende, Regina Sandra Veiga Nascimento & Marco Antonio Chaer Nascimento

  2. Polymères Composites et Hybrides (PCH), IMT Mines Ales, 6, Avenue de Clavières, 30319, Ales Cedex, France

    Raíssa Carvalho Martins & José-Marie Lopez-Cuesta

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  1. Raíssa Carvalho Martins
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  2. Simone Pereira da Silva Ribeiro
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  3. Michelle Jakeline Cunha Rezende
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  4. Regina Sandra Veiga Nascimento
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Resources: J-ML-C; RSVN; MJCR. Supervision: J-ML-C; MACN; SPdSR. Writing (review and editing): J-ML-C; MJCR; MACN; RSVN; SPdSR. Writing (original draft): RCM. Methodology: MJCR; SPdSR. Funding acquisition: MACN; SPdSR. Conceptualization: SPdSR. Formal analysis: RCM. Investigation: RCM.

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Correspondence to Raíssa Carvalho Martins.

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Carvalho Martins, R., Pereira da Silva Ribeiro, S., Jakeline Cunha Rezende, M. et al. Evaluation of the thermal degradation and cone calorimeter parameters of an intumescent composite containing acidic montmorillonites. J Therm Anal Calorim 148, 7669–7686 (2023). https://doi.org/10.1007/s10973-023-12274-2

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