Novel flame retardant poly(thiourea-sulfone-imide)s for high temperature applications: synthesis and characterization

Authors : Ghulam WARIS, Humaira Masood SIDDIQI, Lance James TWYMAN

Pages : 946-958

Doi:10.3906/kim-1207-30

View : 16 | Download : 9

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The synthesis and polymerization of a novel diamine monomer, 1,1-insert ignore into journalissuearticles values(sulfonylbis insert ignore into journalissuearticles values(4,1-phenylene);); bis insert ignore into journalissuearticles values(thiourea); insert ignore into journalissuearticles values(SPT);, with various aromatic dianhydrides were carried out. In addition, the fabrication of polyinsert ignore into journalissuearticles values(thiourea-sulfone-imide);s insert ignore into journalissuearticles values(PTSIs); with noble thermal properties and flame retardancy was conducted. The structures of SPT and polymers were characterized by FT-IR, 1H NMR, and 13C NMR spectroscopy along with elemental analysis. Crystallinity, organosolubility, inherent viscosity, and gel permeation chromatographic measurements were taken as well. The amorphous nature was exhibited by PTSIs containing C=S and --SO2- moieties in the backbone that were readily soluble in highly polar organic solvents. The inherent viscosities of PTSIs were 0.89--1.13 dL g-1 and molecular weights were 87,000--96,550 g mol-1, respectively. Their thermal stability was studied in terms of temperature at 10% weight loss, which ranged between 478 and 526 °C under inert atmosphere. Polyimides had a glass transition temperature around 253--268 °C depending on the dianhydrides used. The flame retardant properties of PTSIs were studied in terms of limiting oxygen index values and were measured in the range of 50--56.
Keywords : Poly thiourea sulfone imide, s, crystallinity, flame retardancy, GPC measurements