Citation: Ye Lei, Ren Jie, Cai Shen-yang, Wang Zhi-gang, Li Jian-bo. Poly(lactic acid) Nanocomposites with Improved Flame Retardancy and Impact Strength by Combining of Phosphinates and Organoclay[J]. Chinese Journal of Polymer Science, ;2016, 34(6): 785-796. doi: 10.1007/s10118-016-1799-z shu

Poly(lactic acid) Nanocomposites with Improved Flame Retardancy and Impact Strength by Combining of Phosphinates and Organoclay

Ye Lei ^a,b ,
Ren Jie ^a,b,, ,
Cai Shen-yang ^b ,
Wang Zhi-gang ^b ,
Li Jian-bo ^a,,

a.
Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai 200092, China
b.
Institute of Nano and Bio-Polymeric Materials, School of Material Science and Engineering, Tongji University, Shanghai 201804, China

Corresponding author: Ren Jie, renjie6598@163.com Li Jian-bo, lijianbo@tongji.edu.cn
Received Date: 27 December 2015
Revised Date: 29 January 2016

Fund Project: the Shanghai Automotive Industry Science and Technology Development Foundation No. 1006the National Natural Science Foundation of China No. 51203118

To minimize the loading level of the char-forming phosphorus based flame retardants in the poly(lactic acid) (PLA) with reduced flammability, we have developed the flame-retarded PLA nanocomposites by melt blending method incorporating organically modified montmorillonite (OMMT) and aluminium diethylphosphinate (AlPi) additives. The influence of AlPi and OMMT on flame retardancy and thermal stability of PLA was thoroughly investigated by means of the limiting oxygen index (LOI), UL94 test, cone calorimeter, X-ray diffraction (XRD), thermogravimetric analysis and scanning electronic microscopy (SEM). The experimental results show that the PLA/AlPi/OMMT system has excellent fire retardancy. The LOI value increases from 19% for pristine PLA to 28% for the flame-retarded PLA. Cone calorimeter analysis of the PLA/AlPi/OMMT exhibits a reduction in the peak heat release rate values by 26.2%. Thermogravimetric analysis and SEM of cone calorimeter residues indicate that OMMT significantly enhances the thermal stability, promotes char-forming and suppresses the melt dripping. The research of this study implies that the combining of the flame retardant and organoclay results in a synergistic effect. In addition, the flame-retarded PLA nanocomposite also exhibits notable increase in the impact strength and the elongation at break.
- Polylactic acid,
- Flame retardancy,
- Nanocomposite,
- Phosphinates,
- Montmorillonite
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