Recycling of polyurethane wastes using different carboxylic acids via acidolysis to produce wood adhesives

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abstract

This study aims to provide further understanding on the depolymerization of polyurethanes (PU) via acidolysis. Therefore, polyurethane foams scraps are chemical recycled using different dicarboxylic acids, namely succinic and phthalic dicarboxylic acids, being the reaction products identified using Fourier-transform infrared spectroscopy, nuclear magnetic resonance and gel permeation chromatography. The results obtained show that succinic acid has higher efficiency as cleavage agent, as a result, the succinic acid ensuing recovered polyol (RP) presents higher hydroxyl value and lower viscosity. Additionally, from the oxidative-induction time measurements, it is observed that the RP is considerably more thermally stable, than the petroleum-based polyol, due to the higher content of aromatic moieties. Afterwards, the RP is used as substitute of petroleum-based polyol in the production of polyurethane adhesives (PUA) and compared with conventional polyol based PUA. Due to the higher content of aromatic moieties, higher bonding strength is achieved using the RP. Overall, further understanding on the acidolysis is obtained, proving the suitability of this method for the recycling of PU.

subject category

Polymer Science

authors

Godinho, B; Gama, N; Barros-Timmons, A; Ferreira, A

our authors

foto Ana Margarida Madeira Viegas de Barros Timmons

Ana Margarida Madeira Viegas de Barros Timmons

Associate Professor
foto Artur Jorge Faria Ferreira

Artur Jorge Faria Ferreira

Professor Coordinator
foto Bruno Miguel Marques Godinho

Bruno Miguel Marques Godinho

PhD Student
foto Nuno Vasco da Costa Gama Batista de Melo

Nuno Vasco da Costa Gama Batista de Melo

Junior Researcher

Groups

G1 - Porous Materials and Nanosystems
G4 - Renewable Materials and Circular Economy

Projects

Valorização de desperdícios de espumas flexíveis de poliuretano por conversão em polióis (FlexiRecover)

CICECO - Aveiro Institute of Materials (UID/CTM/50011/2019)

acknowledgements

European Regional Development Fund, Grant/Award Number: POCI-01-0247-FEDER-003369; Fundacao para a Ciencia e a Tecnologia (PT), Grant/Award Number: UID/CTM/50011/2019

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Publication Details

type
Journal Article
year
2021
journal
JOURNAL OF POLYMER SCIENCE
volume
59
publisher
WILEY
issn
2642-4150
isbn
2642-4169
issue
8
digital object identifier
10.1002/pol.20210066
web of science article identifier
WOS:000624751600001

Citations

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