Flame retardant property of Salen-metal complex polyphosphazenes in epoxy resin

Abstract

Abstract: In order to reduce the fire risk of epoxy resin (EP), three new types of Salen-metal complex polyphosphazene Salen-PZN-M(M = Ni, Zn, Cu) was prepared by condensation polymerization.The structure and morphology of Salen- PZN-M were characterized by infrared spectroscopy (FTIR), electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS).Thermogravimetric analysis (TGA) and conical calorimeter (CCT) were used to characterize the thermal stability and combustion performance of the composite.The flame retardant mechanism of Salen-PZN-M/EP was analyzed by TG-FTIR, SEM, Raman test (LRS) and FTIR.TGA results showed that when Salen-PZN-M (mass fraction 5%)was added, different coordination metals had different effects on the composite.In the conical calorimetric test, the total heat release (PHRR) and total smoke release (TSP) of flame-retardant EP mixed with Salen-PZN-M(mass fraction 5%) were reduced by 20.41%, 37% and 16.93%, respectively, compared with the release of toxic CO gas.TG-FTIR results showed that Salen-PZN-M could reduce the formation of harmful gases.The flame retardant mechanism of Salen-PZN-M may be gas phase quenching, non-flammable gas release, synergistic catalytic carbonization effect and formation of extremely thermal stable components.

Key words: Salen-metal complex polyphosphazene, thermal stability, flame retardant performance

CLC Number:

O633.13

YANG Bao-ping, WANG Nian-nian, CUI Jin-feng, GUO Jun-hong, TIAN Li. Flame retardant property of Salen-metal complex polyphosphazenes in epoxy resin[J]. Journal of Lanzhou University of Technology, 2021, 47(4): 66-75.

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