两种聚磷腈的合成及溶液性质

由六氯环三磷腈高温开环聚合得到聚二氯磷腈,再与不同种类的醇钠和酚钠取代反应合成2种分子量高于3×106的聚双苯氧基磷腈(PDPP)和聚双乙氧基磷腈(PDEP).利用 GPC 与三检测器包括示差、黏度、多角度静态激光光散射(MALLS)]联用的方法研究了 PDPP 和 PDEP 在 THF (含有质量分数0.1%的四正...

Synthesis and Solution Properties of Two Polyphosphazenes

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.