Synergistic effects of a novel silicon‐containing triazine charring agent on the flame‐retardant properties of poly(ethylene terephthalate)/hexakis (4‐phenoxy)cyclotriphosphazene composites

Abstract

A novel triazine oligoimides containing silicone charring agent (TSCA) was prepared and used as charring agents in poly(ethylene terephthalate) (PET)/hexakis (4-phenoxy) cyclotriphosphazene (PNCP) flame retardant system. Limited oxygen index, microscale combustion calorimetry, thermogravimetric analyses, and environment scanning electron microscopy tests were used to study the flame retardance and mechanism of samples. The results revealed that there was a good synergistic effect between TSCA and PNCP in flame retardant PET. The new flame retardant system induced the acid catalytic charring at higher temperature range, enhanced the formation of the integrity and stable char layer, and significantly reduced heat release capacity. Moreover, the prepared PET/PNC/TSCA composites exhibited improved thermal stability and desirable mechanic properties.

Synthesis and Characterization of Aluminum 2-Carboxyethyl-Phenyl-Phosphinate and Its Flame-Retardant Application in Polyester

“…The 1 H nuclear magnetic resonance ( 1 H NMR), 13 C NMR, 27 Al NMR, and 31 P NMR data were obtained while using a Bruker 400 MHz WB Solid-State NMR Spectrometer (Karlsruhe, Germany).…”

“…In recent years, some researchers have been trying several kinds of flame retardants, such as brominated flame retardants [13], phosphorus-containing flame retardant [14,15], intumescent flame retardant [16,17], and nanometer flame retardant [18][19][20] to improve the flame retardancy of polyester textile. Some researchers have been trying to combine some known efficient phosphorus-based characteristic structures or functional groups, such as phosphonate and phosphinate [21][22][23][24], cyclotriphosphazene [25][26][27][28], and phosphinate-POSS [29,30] to prepare the flame-retardant polyester textile.…”

Effect of trisilanolphenyl‐POSS on rheological, mechanical, and flame‐retardant properties of poly(ethylene terephthalate)/cyclotriphosphazene systems

“…The ratio of P content in the exterior char residues was higher than that of PET/5%PACP (0.5%), suggesting more fire‐retardant elements were enriched in the exterior char residue. Meanwhile, quite a few SiO 2 molecules reacted with phosphate at the early stage of the heat degradation and resided in the char layer with P(O) OSi (134.6 eV), SiOPh (130.4 eV), and SiOSiO (102.6 eV) structures (seen in the Supporting Information Figure S6) . Moreover, the C/O ratios of PET/5%PACP and PET/4%PACP/1%T‐POSS were 7.34 and 6.89, respectively, which were higher than that of neat PET (2.36) and PET/1%T‐POSS (3.07).…”

“…Their degree of crystallization was calculated based on our previously reported eq. (), and the results are summarized in Table . where w f is the weight percentage of additives, △ H m represents the enthalpy of melting, and △ H 0 refers to the heat of fusion of 100% crystalline PET, which was 117.57 J/g (28.1 cal/g).…”

“…Figure (B) shows the heat release rate (HRR) versus temperature curves of neat PET and its composites. The heat release capacity (HRC, maximum amount of heat released per unit mass per degree temperature) is recognized to be a reliable indicator of a polymer's flammability . The HRC of PET/1%T‐POSS [486 J (g K) −1 ] was found to be higher than that of neat PET [427.3 J (g K) −1 ].…”