Molded environment-friendly flame-retardant foaming material with high strength based on corn starch modified by crosslinking and grafting
Yanbin Wang
Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in Universities of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou, 730030 People's Republic of China
Search for more papers by this authorCorresponding Author
Qiong Su
Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in Universities of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou, 730030 People's Republic of China
Correspondence to: Q. Su (E-mail: [email protected]) and H. Wang (E-mail: [email protected])Search for more papers by this authorCorresponding Author
Hongling Wang
Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in Universities of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou, 730030 People's Republic of China
Correspondence to: Q. Su (E-mail: [email protected]) and H. Wang (E-mail: [email protected])Search for more papers by this authorXiangfei Zhao
Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in Universities of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou, 730030 People's Republic of China
Search for more papers by this authorShuang Liang
Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in Universities of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou, 730030 People's Republic of China
Search for more papers by this authorYanbin Wang
Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in Universities of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou, 730030 People's Republic of China
Search for more papers by this authorCorresponding Author
Qiong Su
Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in Universities of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou, 730030 People's Republic of China
Correspondence to: Q. Su (E-mail: [email protected]) and H. Wang (E-mail: [email protected])Search for more papers by this authorCorresponding Author
Hongling Wang
Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in Universities of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou, 730030 People's Republic of China
Correspondence to: Q. Su (E-mail: [email protected]) and H. Wang (E-mail: [email protected])Search for more papers by this authorXiangfei Zhao
Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in Universities of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou, 730030 People's Republic of China
Search for more papers by this authorShuang Liang
Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in Universities of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou, 730030 People's Republic of China
Search for more papers by this authorABSTRACT
A flame-retardant foaming material based on corn starch was prepared by a mold pressing method. The starch was crosslinked using Na3[PO3]3 and became gelatinized. Initiated by (NH4)2S2O8, the starch was grafted with methyl acrylate and vinyl acetate by a free-radical polymerization. The starch was mixed with the foaming regent composed of NaHCO3 and azodicarbonamide, and molded at 135 °C and 9 MPa for 10 min. A foaming material with a uniform honeycomb-like structure and relatively high strength was prepared. Its apparent density, tensile strength, impact strength and elongation were 0.685 g cm−3, 1.065 kJ m−2, 3.025 MPa, and 28.8%. It held excellent flame resistance of V-0 rating. Na3(PO3)3 acted both as crosslinker and flame retardant, which effectively simplified the formula. When the material was burnt, a compact charred crust was formed on its surface, which prevented the permeation of oxygen and the release of combustible organic compounds. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47193.
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