Enhancing Char Formation and Flame Retardancy of Ethylene-Vinyl Acetate Copolymer (EVA)/Aluminum Hydroxide (ATH) Composites by Grafting Ladder Phenyl/Vinyl Polysilsesquioxane (PhVPOSS)

• DOI: 10.3390/polym15153312
• Publication Date: 2023-08-05T14:21:39Z
• Authors: Fa Hu; Bo Cheng; Kun Cong; Dinghua Li; Wenchao Zhang; Zhaolu Qin; Rongjie Yang
• Keywords: Cone calorimeter; Thermogravimetric analysis; Ethylene-vinyl acetate; Charring; Thermal Stability; Vinyl acetate

The ladder phenyl/vinyl polysilsesquioxane (PhVPOSS) was used to improve the flame-retardancy performances of ethylene-vinyl acetate copolymer (EVA)/aluminum hydroxide (ATH) composites due reactivity its vinyl groups. FTIR, XPS, 1H NMR, and SEM-EDS data demonstrated PhVPOSS grafting onto EVA molecular chains. improved thermal stability EVA/ATH composites, as shown by thermogravimetric analysis (TGA). Furthermore, with cone calorimeter (CONE) experiments, EVA/ATH/PhVPOSS showed better fire safety than PHRR, PSPR, PCOP reduced 7.89%, 57.4%, 90.9%, respectively. mechanism investigations flame retardancy revealed that charring behaviors were formation Si-C bonds Si-O bonds, a more compact denser char layer can contribute barrier effect.