Yu, Youming and Fu, Shenyuan and Song, Ping'An and Luo, Xiping and Jin, Yongming and Lu, Fengzhu and Wu, Qiang and Ye, Jiewang (2012) Functionalized lignin by grafting phosphorus-nitrogen improves the thermal stability and flame retardancy of polypropylene. Polymer Degradation and Stability, 97 (4). pp. 541-546. ISSN 0141-3910
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.
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| Item Type: | Article (Commonwealth Reporting Category C) |
|---|---|
| Refereed: | Yes |
| Item Status: | Live Archive |
| Additional Information: | Files associated with this item cannot be displayed due to copyright restrictions. |
| Faculty / Department / School: | No Faculty |
| Date Deposited: | 30 May 2017 04:42 |
| Last Modified: | 30 May 2017 04:42 |
| Uncontrolled Keywords: | lignin modification; polypropylene; thermal stability; alkali lignin; char residues; combustion pro-cess; flame retardancy; functionalized; heat release rates; lignin modification; modified lignins; thermodynamics |
| Fields of Research : | 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030301 Chemical Characterisation of Materials |
| Socio-Economic Objective: | E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences |
| Identification Number or DOI: | 10.1016/j.polymdegradstab.2012.01.020 |
| URI: | http://eprints.usq.edu.au/id/eprint/31639 |
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