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Biopolyols obtained via microwave-assisted liquefaction of lignin: structure, rheological, physical and thermal properties

Abstract

The present study examined the application of polyols obtained via microwave-assisted liquefaction of lignin in the production of rigid polyurethane foam. Lignin was liquefed in crude glycerol and 1,4-butanediol at diferent temperatures (130–170 °C), without a catalyst and using various biomass concentrations (15 and 30 wt%). The physicochemical properties, process yield, and FTIR-based identifcation of the obtained polyols were investigated. Under optimal conditions, i.e., a 5-min microwave heating time and a reaction temperature of 150 °C, a polyol characterized by a suitable hydroxyl number of 670 mg KOH/g was obtained with a 93% process yield. Liquefed biopolyol was directly used for the production of rigid polyurethane foams with the addition of polymeric diphenylmethane diisocyanate at the [NCO/OH] ratio of 2:1. Mechanical properties of the obtained foams gradually improved with increasing content of biopolyol. The 5% weight loss temperature (T5) for bio-based foams was higher, respectively 6 and 13 °C compared to the petrochemical foam. Replacement of petrochemical polyether with biopolyols showed the ability to obtain rigid polyurethane foams from lignin and crude glycerol.

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DOI:
Digital Object Identifier (open in new tab) 10.1007/s00226-018-0991-4
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Details

Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
WOOD SCIENCE AND TECHNOLOGY no. 52, pages 599 - 617,
ISSN: 0043-7719
Language:
English
Publication year:
2018
Bibliographic description:
Gosz K., Kosmela P., Hejna A., Gajowiec G., Piszczyk Ł.: Biopolyols obtained via microwave-assisted liquefaction of lignin: structure, rheological, physical and thermal properties// WOOD SCIENCE AND TECHNOLOGY. -Vol. 52, iss. 3 (2018), s.599-617
DOI:
Digital Object Identifier (open in new tab) 10.1007/s00226-018-0991-4
Verified by:
Gdańsk University of Technology

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