Synthesis and Properties of Poly(ether sulfone)s Containing Phthalazinone and Cyclic Phosphine Oxide Moieties

By : Zhang Kun, Xu Jing, Ai Shi-Yun

Page No: 275-286

Abstract
A novel poly(ether sulfone) was synthesized successfully by the copolycondensation of 2,5-dihydroxy -1-biphenylene-phosphine oxide (DOPO-BQ), and 1,2-dihydro-4- (4-hydroxyphenyl)phthalazin-1(2H)-one (DHPZ) biphenol-like monomers with the activated dihalide compound. A series of copolymers containing phthalazinone and cyclic phosphine oxide moieties were synthesized by changing the feed ratio of DHPZ to DOPO-BQ. The chemical structure of the poly(ether sulfone)s was characterized and confirmed by means of fourier transform infrared spectra (FTIR) and nuclear magnetic resonance spectroscopy (1 H NMR, 31P NMR). The glass[1]transition temperatures (Tg ’s) of the synthesized polymers increased as increasing DHPZ content. The effect of the biphenol-like monomer ratio on the thermal properties and the flame retardancy was evaluated by means of thermogravimetric analysis (TGA). A phosphorus and nitrogen synergism attributed the good thermal stabilities to the title polymers, which show a potential application for flame-retardant materials.

Authors :
Zhang Kun, Xu Jing and Ai Shi-Yun : College of Chemistry and Material Science, Shandong Agricultural University, Tai’an 271018, PR China.