Functionalized lignin by grafting phosphorus-nitrogen improves the thermal stability and flame retardancy of polypropylene
Article
Article Title | Functionalized lignin by grafting phosphorus-nitrogen improves the thermal stability and flame retardancy of polypropylene |
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ERA Journal ID | 1691 |
Article Category | Article |
Authors | Yu, Youming (Author), Fu, Shenyuan (Author), Song, Ping'An (Author), Luo, Xiping (Author), Jin, Yongming (Author), Lu, Fengzhu (Author), Wu, Qiang (Author) and Ye, Jiewang (Author) |
Journal Title | Polymer Degradation and Stability |
Journal Citation | 97 (4), pp. 541-546 |
Number of Pages | 6 |
Year | 2012 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0141-3910 |
0144-2880 | |
1873-2321 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.polymdegradstab.2012.01.020 |
Web Address (URL) | http://www.sciencedirect.com/science/article/pii/S0141391012000390 |
Abstract | Improving the thermal stability and flame retardancy of polymers remains a great challenge. Although lignin has been used as a flame retardant for polymers, its flame retardancy effect is usually limited. We, herein, successfully modified alkali lignin by chemically grafting two flame retardant elements, phosphorous and nitrogen, via a three-step reaction. Compared with lignin, modified lignin (PN-lignin) exhibits a much higher char-forming ability with a char of 61.4 wt% (40.7 wt% for lignin) at 600°C in N 2. PN-lignin confers a much higher thermal stability and amount of char residue on polypropylene relative to lignin. Moreover, PN-lignin further reduces the heat release rate and slows the combustion process, indicating a better flame retardancy. The continuous and intact char layer mainly contributes to the improved flame retardancy. This strategy not only provides a novel method for flame retarding polymeric materials, but greatly extends the comprehensive utilization of industrial lignin. |
Keywords | lignin modification; polypropylene; thermal stability; alkali lignin; char residues; combustion pro-cess; flame retardancy; functionalized; heat release rates; lignin modification; modified lignins; thermodynamics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 340399. Macromolecular and materials chemistry not elsewhere classified |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Zhejiang A & F University, China |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4131/functionalized-lignin-by-grafting-phosphorus-nitrogen-improves-the-thermal-stability-and-flame-retardancy-of-polypropylene
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