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Comparison of pentaerythritol and its derivatives as intumescent flame retardants for Polypropylene

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Document pages: 12 pages

Abstract: Hydroquinone bis [bis (2,6,7-trioxyphosphorus bicyclo [2.2.2] - octane-1-oxo-4-hydroxymethyl)] phosphate (pbpp) containing cage phosphate and benzene group was synthesized. The caged phosphate structure of pbpp was characterized by Fourier transform infrared spectroscopy (FT-IR), hydrogen nuclear magnetic resonance (1H-NMR) and phosphorus nuclear magnetic resonance (31P-NMR). The experimental results show that the water resistance, compatibility with polypropylene (PP), thermal stability and flame retardancy of Intumescent Flame Retardant PP (IFR-PP) system are better than 1-oxo-4-hydroxymethyl-1-2,6,7-trioxy-1-phosphorus bicyclo [2.2.2] - octane (PEPA) and pentaerythritol (per). This is attributed to the symmetrical structure and steric hindrance effect of pbpp. IFR-PP system reached UL94 V-0 flammability rating when the minimal addition of IFR with PBPP, PEPA, or PER was 25 , 23 , and 28 , respectively. The flame retardant mechanisms of IFR containing PBPP, PEPA, and PER were investigated by FT-IR and scanning electron microscopy (SEM). PBPP formed a perfect charring layer, with the high carbon content of PBPP helping it form the charring layer more quickly.

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