期刊
FIBERS AND POLYMERS
卷 18, 期 11, 页码 2060-2069出版社
KOREAN FIBER SOC
DOI: 10.1007/s12221-017-1153-2
关键词
Poly(lactic acid); Sulfamic acid; Layered double hydroxides; Flame retardancy
资金
- Beijing Natural Science Foundation [2174083]
- National Natural Science Foundation of China [21674008]
- Fundamental Research Funds for the Central Universities [ZY1611, JD1718]
A novel sulfamic acid intercalated MgAl-LDH (SA-LDH) was prepared by intercalating NH3SO3 (-) into MgAl-layered double hydroxides (LDH), and it was then introduced into poly(lactic acid) (PLA) resin in association with intumescent flame retardant (IFR) by melt blending to prepare a flame-retardant biodegradable PLA composite. The effects of SA-LDH on the flame retardancy of PLA composites were characterized by limiting oxygen index (LOI), vertical burning test (UL-94) and cone calorimeter test (CONE). The results showed that the composite sample containing 19.0 wt% IFR and 1.0 wt% SA-LDH achieved the maximal LOI value of 48.7 %, passed the UL-94 V-0 rating, and significantly decreased the peak heat release rate from 306.3 kW/m(2) of neat PLA to 58.1 kW/m(2). Thermogravimetric analysis showed that both the thermal stability and the char formation were enhanced. The char morphology observation revealed that SA-LDH was beneficial to form dense and compact char layers. It was demonstrated that there existed a synergistic effect between IFR and SA-LDH in promoting the char formation and enhancing the fire resistance. The mechanical and crystallization properties were also tested and discussed.
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