Journal
POLYMER COMPOSITES
Volume 40, Issue 3, Pages 932-941Publisher
WILEY
DOI: 10.1002/pc.24764
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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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Nowadays, numerous works have been undertaken to improve the fire resistance of polylactic acid (PLA). However, the presence of flame retardant usually shows a great destruction on the mechanical properties of PLA matrix, especially the toughness. This paper presents a new approach to simultaneously enhance both the flame retardancy and toughness of PLA by incorporating polyurethane-microencapsulated ammonium polyphosphate (MCAPP). The prepared MCAPP was blended with PLA by melt compounding to prepare PLA/MCAPP composites. The results indicated that the introduction of 15% MCAPP increased the limiting oxygen index of PLA composites from 19.3% to 28.3%, upgraded the UL-94 rating from no rating to V-0, and decreased the peak heat release rate from 464.2 to 332.2 kW/m(2). Even though the tensile strength of PLA composites was decreased to 53.8 MPa, the toughness was significantly improved, with elongation at break lengthened to 40.8% and notched impact strength increased to 2.95 kJ/m(2). The possible mechanisms for both flame retardancy and toughness were also discussed. POLYM. COMPOS., 40:932-941, 2019. (c) 2018 Society of Plastics Engineers
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