2018
DOI: 10.1177/2041247918803187
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Rigid polyurethane foams from unrefined crude glycerol and technical lignins

Abstract: The need for green materials has driven interest in the preparation of rigid polyurethane foam (PUF) from various biomass types. The present study aims at increasing bio-based content by utilizing by-products from both the pulp and paper and biodiesel industries. Bio-based polyols from respective liquefaction of kraft lignin, organosolv lignin and lignosulphonate in crude glycerol were employed to prepare rigid PUFs. The highest foam compressive strength was 345 kPa with density 79 kg m À3 ; thermal conductivi… Show more

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Cited by 6 publications
(1 citation statement)
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“…Comparatively, numerous studies exist on lignin-based rigid PUR foams, , mainly utilizing modified lignins, including oxypropylated, ,, liquefied, , and various other modification techniques , like amination, phenylation/epoxidation, and hydroxymethylation . Oxypropylation is one of the most well-known techniques used to change the phenolic hydroxyl (OH) groups of lignin to aliphatic OH groups and prepare liquid lignin polyol for use in rigid foam .…”
Section: Introductionmentioning
confidence: 99%
“…Comparatively, numerous studies exist on lignin-based rigid PUR foams, , mainly utilizing modified lignins, including oxypropylated, ,, liquefied, , and various other modification techniques , like amination, phenylation/epoxidation, and hydroxymethylation . Oxypropylation is one of the most well-known techniques used to change the phenolic hydroxyl (OH) groups of lignin to aliphatic OH groups and prepare liquid lignin polyol for use in rigid foam .…”
Section: Introductionmentioning
confidence: 99%