title: Effect of cellulose acetate butyrate microencapsulated ammonium polyphosphate on the flame retardancy, mechanical, electrical, and thermal properties of intumescent flame-retardant ethylene-vinyl acetate copolymer/microencapsulated ammonium polyphosphate/polyamide-6 blends.
abstract: Ammonium polyphosphate (APP), a widely used intumescent flame retardant, has been microencapsulated by cellulose acetate butyrate with the aim of enhancing the water resistance of APP and the compatibility between the ethylene-vinyl acetate copolymer (EVA) matrix and APP. The structure of microencapsulated ammonium polyphosphate (MCAPP) was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and water contact angle (WCA). The flame retadancy and thermal stability were investigated by a limiting oxygen index (LOI) test, UL-94 test, cone calorimeter, and thermogravimetric analysis (TGA). The WCA results indicated that MCAPP has excellent water resistance and hydrophobicity. The results demonstrated that MCAPP enhanced interfacial adhesion, mechanical, electrical, and thermal stability of the EVA/MCAPP/polyamide-6 (PA-6) system. The microencapsulation not only imparted EVA/MCAPP/PA-6 with a higher LOI value and UL-94 rating but also could significantly improve the fire safety. Furthermore, the microencapsulated EVA/MCAPP/PA-6 composites can still pass the UL-94 V-0 rating after treatment with water for 3 days at 70 °C, indicating excellent water resistance. This investigation provides a promising formulation for the intumescent flame retardant EVA with excellent properties.
authors.affiliation: State Key Laboratory of Fire Science, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, People's Republic of China.
authors.forename: Bibo
authors.initials: B
authors.lastname: Wang
authors.forename: Qinbo
authors.initials: Q
authors.lastname: Tang
authors.forename: Ningning
authors.initials: N
authors.lastname: Hong
authors.forename: Lei
authors.initials: L
authors.lastname: Song
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Yongqian
authors.initials: Y
authors.lastname: Shi
authors.forename: Yuan
authors.initials: Y
authors.lastname: Hu
mesh_terms: D002209:Caprolactam / Q000031:analogs & derivatives* / Q000737:chemistry; D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D005411:Flame Retardants; D008855:Microscopy, Electron, Scanning; D056951:Photoelectron Spectroscopy; D011108:Polymers / Q000737:chemistry*; D011122:Polyphosphates / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry; D014867:Water / Q000737:chemistry
chemical_list: D005411:Flame Retardants; D011108:Polymers; D011122:Polyphosphates; D011145:Polyvinyls; D000644:Quaternary Ammonium Compounds; D014867:Water; C016438:ethylenevinylacetate copolymer; C009916:nylon 6; D002209:Caprolactam; D002482:Cellulose; C014396:cellulose acetate-butyrate