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Polymers 2019, 11(3), 480;

Vegetable Tannin as a Sustainable UV Stabilizer for Polyurethane Foams

Institute of Polymers, Composites and Biomaterials, National Research Council, P.le E. Fermi 1, 80055 Portici (NA), Italy
Institute for Macromolecular Studies, National Research Council, v. Corti 12, 20133 Milano, Italy
Author to whom correspondence should be addressed.
Received: 7 February 2019 / Revised: 8 March 2019 / Accepted: 8 March 2019 / Published: 12 March 2019
(This article belongs to the Special Issue Foaming and Injection Moulding in Polymer Processing)
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A vegetable tannin, a flavonoid-type natural polyphenolic compound, was used to promote the stabilization of polyurethane foams against UV radiation. Several polyurethane foams were synthesized by using an isocyanate, and a mixture of ethoxylated cocoalkyl amine and vegetable tannin. The content of vegetable tannin was varied from 0 to 40 wt %. The effects of tannin and water (used as a blowing agent) on the foaming kinetics and cellular morphology of foams were investigated. Samples were subjected to accelerated weathering under UV radiation for 3 to 24 h, and FTIR and DMA analyses were conducted to assess the performance change. The former analysis revealed a strong inhibiting effect of tannin on urethane linkage degradation during the UV treatment. The mechanical properties were significantly affected by the addition of tannin. The capability of the foams to withstand UV radiation was dependent on the amount of tannin. At tannin contents higher than 20%, the decrease in mechanical properties under UV irradiation was almost avoided. View Full-Text
Keywords: polyurethane foams; tannin; degradation; mechanical properties; UV radiation polyurethane foams; tannin; degradation; mechanical properties; UV radiation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Oliviero, M.; Stanzione, M.; D’Auria, M.; Sorrentino, L.; Iannace, S.; Verdolotti, L. Vegetable Tannin as a Sustainable UV Stabilizer for Polyurethane Foams. Polymers 2019, 11, 480.

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