Xingguo Wang, Shuheng Wang, Wenjia Wang, Hongfei Li, Xiaodong Liu, Xiaoyu Gu, Serge Bourbigot, Zhongwei Wang, Jun Sun*, Sheng Zhang*. The flammability and mechanical properties of poly(lactic acid) composites containing Ni-MOF nanosheets with polyhydroxy groups. Composites Part B: Engineering. 2019, http://doi.org/ 10.1016/ j.composite**.2019.107568

Abstract

This work reports our recent effort on the preparation of α-Phenyl-N-(2-propyl-2-hydroxymethyl-1, 3-dihydroxy)-imine-Nickel (Ⅱ) (Ni-MOF) containing polyhydroxy groups and its application in improving the fire performance of PLA composites in combination with ammonium polyphosphate (APP). The flame retardant evaluation revealed that the presence of 1.7% Ni-MOF and 3.3% APP in PLA increased the LOI value to 31.0%, upgraded the UL-94 level to V-0, decreased the peak heat release rate (pHRR), total heat release (THR) and total **oking production (TSP) by 27%, 19% and 50%, respectively, and substantially delayed the time to ignition (TTI) from 67 to 97 s. It was proposed that the flame retardants take effect in both vapor and condensed phases, and Ni-MOF nanosheets can synergistically improve the flame resistance of PLA with APP. The incorporation of Ni-MOF effectively inhibited the deterioration of mechanical properties for PLA composites caused by the presence of APP.