Characterization of Kraft Lignin Fractions Obtained by Sequential Ultrafiltration and Their Potential Application as a Biobased Component in Blends with Polyethylene
| Autor: | Juan He, Robert H. Narron, Qiang Yong, Yuhan Wang, Caoxing Huang |
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| Rok vydání: | 2017 |
| Předmět: |
Chromatography
010405 organic chemistry Renewable Energy Sustainability and the Environment Chemistry General Chemical Engineering Dispersity Ultrafiltration Fraction (chemistry) 02 engineering and technology General Chemistry Fractionation Polyethylene 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Chemical engineering Environmental Chemistry Lignin Thermal stability 0210 nano-technology Black liquor |
| Zdroj: | ACS Sustainable Chemistry & Engineering. 5:11770-11779 |
| ISSN: | 2168-0485 |
| DOI: | 10.1021/acssuschemeng.7b03415 |
| Popis: | Fractionation of Kraft lignin from black liquor is necessary to reduce its heterogeneity, which exerts negative effects upon lignin-commercial polymer composite materials. In this work, Kraft lignin was dissolved in acetic acid to get low viscosity lignin solution and fractionated into specific molecular weight fractions by sequential ultrafiltration with different molecular weight cut-offs. The fractionated lignins were characterized, and their suitability in polyethylene–lignin composites was evaluated. After ultrafiltration with 5k and 3k Da cutoff, fractionation resulted in three fractions of differing molecular weights and lower polydispersity than the original Kraft lignin (F1 (7010 g/mol), F2 (3540 g/mol), and F3 (1890 g/mol)). The results from spectroscopic characterization of lignin (31P, 13C, and 2D-HSQC NMR) and thermal stability analysis (TGA and DSC) indicated that the contents of various linkages and functional groups and the thermal properties of each fraction varied as a function of its mo... |
| Databáze: | OpenAIRE |
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