Silylation of epoxidized soybean oil with triethoxysilanes, synthesis and characterization of their polyurethanes

Authors : Aynur ÖZŞEKER, Kemal KARADENİZ, Mustafa Yasin ŞEN

Pages : 1365-1382

View : 21 | Download : 6

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Silylation of epoxidized soybean oil insert ignore into journalissuearticles values(ESBO); was carried out by epoxy ring opening reaction of methoxy and ethoxy silane compounds. $^{1}$H NMR and FTIR spectra confirmed that two novel bio-based polyols, PSiTh and PSiAm, were obtained through the ring opening of epoxy by the mercapto and amino moieties of MPTMS and APTES, respectively. Polyurethanes of these polyols were prepared using 4,4`- methylene-bisinsert ignore into journalissuearticles values(phenyl isocyanate); insert ignore into journalissuearticles values(MDI); to incorporate silanol groups into polymer network and were labeled as PUSiTh and PUSiAm, respectively. To see the impact of silanol and phosphorous groups on flame retardant properties, the chain extended polyurethanes, PUSiThCE and PUSiAmCE were also prepared with bisphenol-A bis insert ignore into journalissuearticles values(hydroxy phenyl phosphonate); insert ignore into journalissuearticles values(BABHPP);. Polyurethanes bearing thio-ether bonds besides alkoxy silane groups were characterized using FTIR spectroscopy. Prepared foams exhibited significant thermal stability and flame retardant properties with a limiting oxygen index insert ignore into journalissuearticles values(LOI); of 22-24%. Chain extended polyurethanes had 11-13% higher LOI value than the corresponding non-chain extended polyurethanes.
Keywords : Silylation, biobased, polyurethane, foam, flame retardant