@article{Al-Shukri_Mahmood_Al Hanbali_2021, title={Spiro-cyclotriphosphazene with three functional end groups: synthesis and structural characterization of new polycyclotriphosphazenes with Schiff-base groups}, volume={66}, url={http://ichp.vot.pl/index.php/p/article/view/482}, DOI={10.14314/polimery.2021.6.2}, abstractNote={<p>A new tris-spiro-(3,4-dioxybenzaldehyde)cyclotriphosphazene [PNCHO] was synthesized from the condensation of hexachlorocyclotriphosphazene with 3,4-dihydroxybenzaldehyde in the presence of strong base. Further reaction of the trialdehydic cyclotriphosphazene based molecules [PNCHO] with three different dianilines (benzidine, 4,4’-methylenedianiline and 4,4′-Sulfonyldianiline) resulted in creation of a new poly(tris-spiro-3,4-dioxbenzene)cyclotriphosphazenes with Schiff-base groups [PNSB1-3]. The structures of [PNCHO] and the polycyclotriphosphazenes-schiff base derivatives were characterized by means of FTIR, <sup>1</sup>H, <sup>13</sup>C NMR and C.H.N elemental analysis. Differential scanning calorimetery (DSC) revealed a relatively high glass transition temperature (135−175<sup>°</sup>C) of obtained polymers. Thermal gravimetric analysis (TGA) exhibited their good thermal stability (up to 375<sup>o</sup>C). The char yield was about 36-42% at 700°C. All polymers were self-extinguishable as the LOI (Limiting Oxygen Index) values were above 26% and this meets with the V-0 and V-1, classification (UL-94). No fumes, soot, or toxic gases emission were observed during burning. The polymers obtained can be used as environmentally friendly, flame-retardant materials.</p>}, number={6}, journal={Polimery}, author={Al-Shukri, Salah and Mahmood , Ayad Tarik and Al Hanbali, Othman A.}, year={2021}, month={Jul.}, pages={341-349} }