Journal
POLYMERS FOR ADVANCED TECHNOLOGIES
Volume 22, Issue 12, Pages 2295-2301Publisher
WILEY
DOI: 10.1002/pat.1760
Keywords
poly(lactic acid) (PLA); APP; PEG; flame-retardant; toughening
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Funding
- National Science Foundation of China [50933005, 50703026]
- International Foundation for Science [F/4285-1]
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In order to modify the brittleness and flame retardant properties of poly(lactic acid) (PLA), a series of flame retardant toughened PLA composites were prepared using poly(ethylene glycol) 6000 (PEG6000) as a toughening and charring agent together with ammonium polyphosphate (APP) as an acid source and blowing agent. The fire and thermal behavior of PLA/PEG/APP composites was evaluated by limiting oxygen index (LOI), UL-94, cone calorimeter, and thermogravimetric analysis (TGA). The results showed that the PLA/PEG/APP system had good charring ability and could improve the flame retardancy of PLA. When the content of APP in the composites was more than 5 wt%, all samples could reach UL-94 V-0 rating. The results of mechanical property tests demonstrated that the brittleness of PLA was also improved after blended with PEG6000. All the PLA/PEG/APP composites with an APP content of less than 10 wt% showed an obvious neck and fracture behavior, that is, the tensile behavior of PLA was changed from brittle to ductile. Copyright (C) 2010 John Wiley & Sons, Ltd.
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