Preparation of a novel phosphorus‐containing organosilicon and its effect on the flame retardant and smoke suppression of polyethylene terephthalate

Abstract

A novel phosphorus‐containing silicone flame retardant (PDPSI) was prepared by Mannish reaction, and a series of PDPSI/PET composites were prepared by melt blending method. The nuclear magnetic resonance (1H NMR), Fourier transformation infrared (FTIR), and the thermogravimetric analyzer (TGA) results indicated that PDPSI showed network structure and owned good thermal stability, with the char residue of 62.2% at 800°C. The flame retardancy of PDPSI/PET composites was characterized by limiting oxygen index (LOI), vertical burning tests (UL‐94), and cone calorimeter (CCT). The results revealed that the addition amount of PDPSI was 5%, the LOI value of PDPSI/PET composites increased to 27.3%, and UL‐94 test passed V‐0 rating. When the PDPSI loading was 3%, PET composites showed excellent flame retardancy and smoke suppression, with a decrease in the peak heat release rate (PHRR) by 71.19% and the total smoke release (TSP) reduced from 14.4 to 11.1m2. The scanning electron microscopy (SEM) and FTIR results of char residue demonstrated that the flame‐retardant mechanism of PDPSI was solid phase flame retardant. PDPSI catalyzed the aromatization reaction of PET to promote the formation of a dense and continuous carbon layer, finally improving the flame retardancy and smoke suppression properties of PET.

Phosphate-Functionalized Silica for Improved Flame Retardancy and Thermal Stability of Thermoplastic Polyurethane

“…Also, the presence of phosphorus in the char implies the formation of phosphoric acid, which helps in the aromatization. 42,43 In addition to the phosphorus and silicon contents, the carbon content of TPU also increases upon increasing PhosFS. It has been postulated that phosphoric acid can be produced by the phosphate groups, which helped in the formation of carbon content.…”

Investigation of novel intumescent flame retardant low‐density polyethylene based on SiO2@MAPP and double pentaerythritol

“…Because the SiO 2 layer covered on the surface of APP prevented or delayed the formation of small molecular combustibles into the gas phase and played a flame-retardant role, which could protect the substrate. [48] In addition, the SiO 2 layer promoted the formation of carbon and the thickness of the carbon layer. [49] 4 | CONCLUSIONS In this study, the intumescent flame-retardant LDPE composites were prepared by introducing a novel IFR based on SiO 2 @MAPP and DPER.…”

Functionalization of PET with Phosphazene Grafted Graphene Oxide for Synthesis, Flammability, and Mechanism

“…Therefore, enhancing the flame-retardant properties of PET is becoming a critical problem and has attracted great attention in recent decades [ 6 , 7 ]. Many reliable flame retardants, strategies and methods for suppressing fires have been developed by delaying the ignition or decreasing the release of heat and smoke [ 8 , 9 , 10 , 11 , 12 , 13 ]. Different types of fillers such as clay [ 14 ], silica [ 15 , 16 , 17 ] and metal oxide nanoparticles [ 18 , 19 , 20 , 21 ] have been incorporated into the PET matrix, which can achieve better flame-retardant, but the effect depends mainly on the type and the contents of the particles used most of which would destroy the mechanical properties.…”