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Issue 28, 2017
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Fire-resistant tannin–ethylene glycol gels working as rubber springs with tuneable elastic properties

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Abstract

Fire-resistant elastic materials made from tannin, a natural polyphenol extracted from tree barks, and having the appearance and the consistence of rubber are described. They can be produced in any dimension and with any shape based on a quite simple protocol, only consisting in mixing tannin, water and ethylene glycol, in the presence of a low amount of p-toluene sulphonic acid. After curing at 85 °C in an oven and subsequent drying, black elastic blocks are recovered whose mechanical properties can be easily adjusted from the proportions of the ingredients, especially with the amount of ethylene glycol acting as plasticiser. As a result, materials from extra-soft to hard can be obtained. Their retardant performance towards fire is demonstrated, a well-known feature of phenolic compounds here observed for the first time with an elastic material. Physicochemical analyses are performed and explain the chemistry behind the performances of these new biosourced materials.

Graphical abstract: Fire-resistant tannin–ethylene glycol gels working as rubber springs with tuneable elastic properties

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Supplementary files

Article information


Submitted
02 May 2017
Accepted
13 Jun 2017
First published
13 Jun 2017

J. Mater. Chem. A, 2017,5, 14720-14732
Article type
Paper

Fire-resistant tannin–ethylene glycol gels working as rubber springs with tuneable elastic properties

C. Delgado-Sánchez, G. Amaral-Labat, L. I. Grishechko, A. Sánchez –Sánchez, V. Fierro, A. Pizzi and A. Celzard, J. Mater. Chem. A, 2017, 5, 14720 DOI: 10.1039/C7TA03768F

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