Citation: Shuang-lan Du, Xue-bao Lin, Rong-kun Jian, Cong Deng, Yu-zhong Wang. Flame-retardant Wrapped Ramie Fibers towards Suppressing Candlewick Effect of Polypropylene/Ramie Fiber Composites[J]. Chinese Journal of Polymer Science, ;2015, 33(1): 84-94. doi: 10.1007/s10118-015-1560-z shu

Flame-retardant Wrapped Ramie Fibers towards Suppressing Candlewick Effect of Polypropylene/Ramie Fiber Composites

1.
Center for Degradable and Flame-Retardant Polymeric Materials, College of Chemistry, State Key Laboratory of Polymer Materials Engineering, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), Analytical and Testing Center, Sichuan University, Chengdu 610064, China

Received Date: 3 April 2014
Revised Date: 13 May 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 50933005 and 51121001) and the Program for Changjiang Scholars and Innovative Research Team in Universities (IRT1026).

In this work, a flame-retardant polypropylene (PP)/ramie fiber (RF) composite was prepared. The ramie fibers were wrapped chemically by a phosphorus- and nitrogen-containing flame retardant (FR) produced via in situ condensation reaction so as to suppress their candlewick effect. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) demonstrated that the ramie fibers wrapped chemically by FR (FR-RF) were obtained successfully. Thermogravimatric test showed that the PP/FR-RF composite had more residue and better thermal stability at high temperatures than the PP/RF composite. Cone calorimeter (CC) results indicated that the peak of heat release rate (PHRR) and total heat release (THR) correspondingly decreased by 23.4% and 12.5% compared with the values of neat PP/RF. The PP/FR-RF composite created a continuous and compact char layer after the combustion. Combining FTIR analysis of char residue after CC test with heat conduction coefficient results, it could be concluded that the charring of FR on RF greatly weakened the candlewick effect of RF, and more char residue in the RF domain facilitated the formation of more continuous and compact char layer in the whole combustion zone, consequently protected PP composites during combustion, resulting in the better flame retardancy of PP/FR-RF composite than that of PP/RF composite.
- Ramie fiber,
- Polypropylene,
- Composite,
- Flame retardance,
- Candlewick effect
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沈阳化工大学材料科学与工程学院沈阳 110142