Structural and Thermal Characteristics of Novel Organosolv Lignins Extracted from Thai Biomass Residues: A Guide for Processing.
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| Title: | Structural and Thermal Characteristics of Novel Organosolv Lignins Extracted from Thai Biomass Residues: A Guide for Processing. |
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| Authors: | Wannid, Prapudsorn1 (AUTHOR), Hararak, Bongkot1 (AUTHOR), Padee, Sirada1 (AUTHOR), Klinsukhon, Wattana1 (AUTHOR), Suwannamek, Natthaphop1 (AUTHOR), Raita, Marisa2,3 (AUTHOR), Khao-on, Krit3 (AUTHOR), Prahsarn, Chureerat1 (AUTHOR) chureerp@mtec.or.th |
| Source: | Journal of Polymers & the Environment. Jul2022, Vol. 30 Issue 7, p2739-2750. 12p. |
| Subject Terms: | *Biomass, *Agricultural wastes, Lignin structure, Lignins, Chemical fingerprinting, Molecular structure |
| Abstract: | This work was the first to reveal structural and thermal characteristics of biomass lignins obtained from Thai agricultural residues; bagasse (BG), para-rubber wood (PRW), and palm kernel shell (PKS). 31P NMR spectra revealed that PRW-lignin contained mainly C5-substituted hydroxyl group (OH) while PKS-lignin contained high portion of C5-substituted OH, followed by guaiacyl OH and p-hydroxyphenyl OH. BG-lignin contained equivalent portion of the three OH groups. Commercial organosolv (C) and kraft (S) lignins were found to consist of C5-substituted OH and guaiacyl OH. The structural information was confirmed by FTIR fingerprints. Such molecular structures influenced their thermal characteristics and processing. From GPC results, S-lignin had the highest Mw of 6.0 × 103 Da and PRW-lignin had the lowest Mw of 1.63 × 103 Da. TGA analysis revealed that S-lignin possessed the highest thermal stability (Td = 394.7 °C) while that of the others were in the range of 348.0–377.2 °C. Tg from DSC thermograms of C-, S-, BG-, PRW-, and PKS-lignins were 155.2, 139.9, 115.6, 98.5, and 142.3 °C, respectively. Extensive DSC investigation revealed a temperature window of processing for the biomass lignins, being between their Tg and 170 °C. This study offers important insight on Thai biomass lignins, which enable us to manipulate them efficiently during melt processing. [ABSTRACT FROM AUTHOR] |
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| Abstract: | This work was the first to reveal structural and thermal characteristics of biomass lignins obtained from Thai agricultural residues; bagasse (BG), para-rubber wood (PRW), and palm kernel shell (PKS). 31P NMR spectra revealed that PRW-lignin contained mainly C5-substituted hydroxyl group (OH) while PKS-lignin contained high portion of C5-substituted OH, followed by guaiacyl OH and p-hydroxyphenyl OH. BG-lignin contained equivalent portion of the three OH groups. Commercial organosolv (C) and kraft (S) lignins were found to consist of C5-substituted OH and guaiacyl OH. The structural information was confirmed by FTIR fingerprints. Such molecular structures influenced their thermal characteristics and processing. From GPC results, S-lignin had the highest Mw of 6.0 × 103 Da and PRW-lignin had the lowest Mw of 1.63 × 103 Da. TGA analysis revealed that S-lignin possessed the highest thermal stability (Td = 394.7 °C) while that of the others were in the range of 348.0–377.2 °C. Tg from DSC thermograms of C-, S-, BG-, PRW-, and PKS-lignins were 155.2, 139.9, 115.6, 98.5, and 142.3 °C, respectively. Extensive DSC investigation revealed a temperature window of processing for the biomass lignins, being between their Tg and 170 °C. This study offers important insight on Thai biomass lignins, which enable us to manipulate them efficiently during melt processing. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 15662543 |
| DOI: | 10.1007/s10924-022-02387-4 |
