Journal
POLYMER DEGRADATION AND STABILITY
Volume 147, Issue -, Pages 142-150Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2017.12.004
Keywords
Poly (lactic acid); Phosphotungstic acid; Layered double hydroxides; Flame retardancy
Categories
Funding
- Beijing Natural Science Foundation [2174083]
- National Natural Science Foundation of China [21674008]
- Fundamental Research Funds for the Central Universities [ZY1611, JD1718]
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Phosphotungstic acid is a typical kind of superior catalysts, and it is hardly to intercalate into the layered double hydroxides (LDH) by ion-exchange process because of its low negative charge. In this work, a phosphotungstic acid intercalated MgAl-LDH (PWA-LDH) was prepared by reconstruction method, and it was then introduced into poly (lactic acid) (PLA) resin in association with intumescent flame retardant (wit) by melt blending to prepare a flame-retardant biodegradable PLA composite. The effects of PWA-LDH on the flame retardancy of PLA composites were characterized by limiting oxygen index (LOI), vertical burning test (UL-94) and cone calorimeter test. The results showed that the composite sample containing 18.0 wt% IFR and 2.0 wt% PWA-LDH achieved the maximal LOI value of 48.3%, 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 40.1 kW/m(2). Thermogravimetric analysis showed that both the thermal stability and the char formation were enhanced. The char morphology observation revealed that PWA-LDH was beneficial to form dense and compact char layers. It was demonstrated that there existed a synergistic effect between IFR and PWA-LDH in promoting the char formation and enhancing the fire resistance.
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