Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 4, Issue 10, Pages 5212-5222Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b00903
Keywords
Lignin; Silylation; Acetylation; Hydrophobization; Polyethylene
Categories
Funding
- Fond National de la Recherche of Luxembourg (FNR) [9903572]
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Soda lignin was functionalized with tert-butyldimethylsilyl groups by the reaction with tert-butyldimethylsilyl chloride. The reaction conditions leading to a quantitative derivatization of lignin, hydroxyl groups were determined by P-31 and H-1 NMR and compared with those of acetylation. The functionalization was also confirmed by FTIR and size exclusion chromatography. The silylation enhances the thermal stability and lowers the T-g of lignin as compared to the acetylation. In addition, the silylated lignins are soluble in a wider range of organic solvents, including solvents of low polarity and show a clear hydrophobic character with a contact angle with water higher than 100 degrees. Neat, acetylated, and silylated lignins were then blended with low density polyethylene, and injection molded materials were analyzed with tensile tests, dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). This study reveals the higher compatibility of the silylated lignin with the polyolefin matrix and hence the great potential of the silylated lignin for a use as an additive in apolar polymer matrices.
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