writer：Shan Xueying, Han Ji, Jiang Kuanyu, Li Jinchun*
keywords：synergistic effect；thermal stability；flame retardancy
source：期刊
specific source：Polymer Composites
Issue time：2019年
NiFe2O4 nanoparticles loaded on graphene layers (NiFe2O4@GR) was prepared by the hydrothermal method, and it first combined with intumescent flame retardant (IFR) consisting of polyphosphate (APP) and pentaerythritol (PER) was used to prepare polylactic acid (PLA) composites. Effect of NiFe2O4@GR and IFR on thermal stability and flame retardancy of PLA was investigated. LOI value of all the PLA composites increased, and the results of UL-94 tests passed V0 ratings. With the presence of NiFe2O4@GR in intumescent flame retarded PLA composites, the initial degradation temperature had a big increase and char residue increased apparently. The ratio of graphite crystalline carbon was increased. The denser and more intumescent char layer of was formed. In addition, NiFe2O4@GR had the reinforcing effect for PLA. Therefore, NiFe2O4@GR and IFR had a good synergistic effect in improving thermal stability and flame retardancy of PLA.