New Flame-Retardant Poly(ester-imide)s Containing Phosphine Oxide Moieties in the Main Chain: Synthesis and Properties

Authors : Khalil FAGHIHI

Pages : 663-671

View : 9 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Six new flame-retardant polyinsert ignore into journalissuearticles values(ester-imide);s insert ignore into journalissuearticles values(9a-f); with high inherent viscosity and containing phosphine oxide moieties in the main chain were synthesized from the polycondensation reaction of N,N-insert ignore into journalissuearticles values(3,3-diphenylphenyl phosphine oxide); bistrimellitimide diacid chloride insert ignore into journalissuearticles values(7); with 6 aromatic diols insert ignore into journalissuearticles values(8a-f); by 2 different methods:--solution and microwave-assisted polycondensation. The results showed that compared to solution polycondensation, the microwave-assisted polycondensation reaction using a domestic microwave oven proceeded rapidly and was completed within about 9-12 min. All of the obtained polymers were fully characterized by means of elemental analysis, viscosity measurement, solubility testing, and FT-IR spectroscopy. Thermal properties and flame retardant behavior of the PEIs insert ignore into journalissuearticles values(9a-f); were investigated by using thermal gravimetric analysis insert ignore into journalissuearticles values(TGA and DTG); and the limited oxygen index insert ignore into journalissuearticles values(LOI);. Data obtained by thermal analysis insert ignore into journalissuearticles values(TGA and DTG); revealed that these polyinsert ignore into journalissuearticles values(ester-imide);s had good thermal stability. Furthermore, high char yields in TGA and good LOI values indicated that incorporating phosphine oxide moieties in the polymer backbone markedly improved their flame retardancy. These polymers can be potentially utilized in flame retardant thermoplastic materials.
Keywords : Flame retardant polymers, hosphine oxide moieties, N 3, 3 diphenylphenyl phosphine oxide, bistrimellitimide diacid chloride, romatic diols