Abstract: Firstly, polydichlorophosphazene was synthesized through ring-opening polymerization of phosphonitrilic chloride trimer at high temperature. Then the two polyphosphazene samples with different side groups were synthesized through reaction of polydichlorophosphazene with different sodium alkoxides or sodium phenolates. These polymers have high Mw up to 3×106 and are studied with gel permeation chromatography (GPC) coupled with multidetectors including refractive index detector, viscometer, multi-angle laser light scattering (MALLS) in THF with 0.1% tetra-n-butylammonium bromide at 35 oC. Rg/Rh of polydiphenoxyphosphazene (PDPP) and polydiethoxyphosphazene (PDEP) is 2.17 and 2.23. Their scaling relations are [η]=9.10×10-2Mw0.58 and ＜Rg＞Z=1.62×10-2Mw0.58 for PDEP while [η]=1.71×10-2Mw0.64 and ＜Rg＞Z=0.80×10-2Mw0.60 for PDPP. It indicates that both polyphosphazenes exhibit a random coil conformation in THF.

Key words: polyphosphazene, synthesis, solution property, chain conformation