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Production of Bio-based Polyol from Oxypropylated Pyrolytic Lignin for Rigid Polyurethane Foam Application

  • Thana Saffar
  • Hassine Bouafif
  • Flavia Lega BraghiroliEmail author
  • Sara Magdouli
  • Armand Langlois
  • Ahmed Koubaa
Original Paper
  • 31 Downloads

Abstract

A recent trend in ecofriendly product development is the use of added-value lignin residues. This study aimed to assess the potential use of pyrolytic lignin (PL) for producing rigid polyurethane foam (RPUF). For this purpose, PL was recovered from bio-oil using water as extraction solvent. The PL was then subjected to oxypropylation in the presence of KOH and under mild temperature and pressure (482 K; 14 Bar). FTIR and hydroxyl number quantification was used to confirm and assess the occurrence of oxypropylation reaction. Thus, oxypropylated lignin (OL) was successfully used to produce RPUF. Results revealed a lignin recovery yield of 30 ± 4% relative to the bio-oil weight. FTIR and NMR showed that the PL retained its aromatic structure after pyrolysis cracking. The weight ratio obtained after oxypropylation was 50/50/5 lignin/propylene oxide/KOH with a hydroxyl number of 703 mg KOH/g. Gradual substitution of polyol with OL ranged from 10 to 50%, and the ensuing foams were characterized in terms of chemical, physical, and morphological properties. Modulus of elasticity and insulation performance of 20% OL-based foam increased by 17% and 5.5%, respectively, compared to the commercial rigid polyurethane foam (CRPUF). SEM micrographs for OL-based polyurethane foams showed smaller cell structure, which is desirable for increasing rigidity. These findings demonstrate the potential use of pyrolytic lignin in the manufacturing of high performance biobased insulation materials.

Graphic Abstract

Keywords

Bio-sourced materials Rigid polyurethane foams Bio-based polyol Pyrolytic bio-oil Pyrolytic lignin Oxypropylation 

Abbreviations

ASTM

American Society for Testing and Materials

CRPUF

Commercial rigid polyurethane foam

DTG

Derivative thermogravimetry

FTIR

Fourier Transform InfraRed Spectroscopy

FTIR-ATR

Fourier transform infrared spectroscopy in attenuated total reflection

KOH

Potassium hydroxide

LS

LignoSulfonate

LSPUF

Lignosulfonate-based polyurethane foam

NaOH

Sodium hydroxide

NMR

Nuclear magnetic resonance

OL

Oxypropylated lignin

OLPUF

Oxypropylated lignin-based polyurethane foam

PL

Pyrolytic lignin

PPO

Propylene oxide

PU

Polyurethane

RPU

Rigid polyurethane

RPUF

Rigid polyurethane foam

SEM

Scanning electron microscopy

TGA

Thermogravimetric analysis

TG

Thermogravimetry

Notes

Acknowledgements

Sincere thanks are due to the National Sciences and Engineering Research Council of Canada (Project Number: 499133), the Centre Technologique des Résidus Industriels, the Chaire de Recherche de la Valorisation de la Caractérisation et de la Transformation du Bois, EnerLab, and AbriTech for their in-kind and financial contribution, which enabled us to conduct this study. The authors gratefully acknowledge the assistance of Gilles Villeneuve during the experiments. The views and opinions expressed in this paper are those of the authors.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Thana Saffar
    • 1
    • 2
  • Hassine Bouafif
    • 2
  • Flavia Lega Braghiroli
    • 2
    Email author
  • Sara Magdouli
    • 2
  • Armand Langlois
    • 3
  • Ahmed Koubaa
    • 1
  1. 1.Research Forest Institute (Institut de recherche sur les forêts – IRF), University of Québec in Abitibi-Témiscamingue (UQAT)Rouyn-NorandaCanada
  2. 2.Centre Technologique des Résidus Industriels (CTRI, Technology Center for Industrial Waste), Cégep de l’Abitibi-Témiscamingue (College of Abitibi-Témiscamingue)Rouyn-NorandaCanada
  3. 3.EnerLab, 1895 Chemin de l’IndustrieSaint-Mathieu-de-BeloeilCanada

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