The behavior and mechanism of tris‐(3‐dopo‐propyl)‐triazine trione flame retardant polyethylene terephthalate

Abstract

A 9,10-dihydro-9-oxa-10 phosphophenanthrene-10-oxide based derivative tris-(3-dopo-propyl)-triazine trione (TAD) is applied to polyethylene terephthalate (PET). The melting and blending process of the composite is carried out through twin screws. The flame retardancy, thermostability, and mechanical property have elevated with slight load agent. The limiting oxygen index (LOI), vertical burning test (UL 94), and cone calorimeter test are proceeded to sustain the flame retardancy of PET/TAD-x. The 30.2% LOI value and UL 94V-1 rating will be attained with 5 wt% load, the peak of heat release rate show 33.4% decrease, concurrently. The thermogravimetric analysis is performed to characterized the constancy of flame retardant composites during the heating process. Relevant evidence express that TAD provided appreciable assistance in improving carbon-forming capacity and postponing initial decomposition temperature. The Raman spectra, TG-Fourier transform infrared, Hot-Stage FTIR are used to explain the connection about the optimization of performance and the alteration of products in pyrolyzing or after pyrolyzation. In addition, the mechanical properties are supported via tensile and impact test. This study confirms TAD has great potential competitiveness in future halogen-free flame retardant applications as viable and environmentally friendly to polyester material.