中文摘要：

用蒸汽压渗透法,探讨在不同的溶剂和温度下,用单点法和多点法测定聚二（甲氧基乙氧基乙氧基）磷腈的相对分子质量,研究最佳的测定条件.通过实验比较得出：以甲醇作为溶剂,在40℃下,稳定7 min测定出的数据较稳定、可靠.单点法与多点法相比较,单点法具有更为简单、快捷等特点,所以单点法完全可以用来测定聚磷腈的相对分子质量.

英文摘要：

The measurement of molecular weight of poly [ di （methoxy-ethoxyethoxy） phosphazene] （MEEP） by vapor pressure osmometry was investigated. The effect of solvents and temperature on determina- tion of the molecular weight of the polymer was studied. The obtained results showed that the determined data were reliable, when the measurement was conducted after seven minutes at 40 ~（2 for stability. Single-spot method is simpler and quicker than multi-spots method. So single-spot method can be used to determine molecular weights of polyphosphazenes.