Synthesis and characterization of cage structured flame resistant melamine and pentaerythritol based polymer networks

In this study, a Schiff base 2,4,6-tris(4-hidroksibenzimino)-1,3,5-triazine (HT) was synthesized from condensation reaction of 4-hydroxybenzaldehyde and melamine. Subsequently, various imine or ether bond cage polymers were synthesized using 2,4,6-tris(4-hydroxybenzimino)-1,3,5-triazine (HT), pentaerythritol (PT), 1,5-dibromopentane (DP), and p-xylylene dibromide (DX) in DMF. The structures of the compounds were characterized using FT-IR, 1H, 13C-NMR and TGA measurements. The surface morphologies, particle ratious and the glass transition temperatures of polymers were found from SEM, DLS and DSC measurements, respectively. The melamine-based polymers PHTDX and PHTDP were synthesized from the monomer HT. Pentaerythritol-based PPTDX and PPTDP polymers were synthesized from the monomer PT. Melamine (M) and pentaerythritol are used in many applications, such as fire-resistant coatings and flame-retardant plastics. Thermally stable polymers were prepared with melamine and pentaerythritol. Based on SEM images, the polymers were found to have a porous structure. These pores make the polymers flame retardant by trapping combustible gases during thermal degradation. The limiting oxygen index values of PHTDX, PHTDP, PPTDX, and PPTDP at 1000 & DEG;C were reported to be 43.96, 40.42, 31.35 and 23.11, respectively, in TGA measurements.Graphical AbstractSynthesis and characterization of cage structured flame resistant melamine and pentaerythritol based polymer networksIsmet Kaya, Ruhsar Ela Iris, Hatice Karaer YagmurGraphical AbstractSynthesis and characterization of cage structured flame resistant melamine and pentaerythritol based polymer networksIsmet Kaya, Ruhsar Ela Iris, Hatice Karaer Yagmur

Automated summary

In this study, a Schiff base, 2,4,6-tris(4-hydroxybenzimino)-1,3,5-triazine (HT), and its derivatives were synthesized and used as building blocks to prepare flame-resistant polymers. The resulting melamine and pentaerythritol-based polymers exhibited excellent flame retardancy.