蒸汽压渗透法在聚膦腈相对分子质量测定中的应用

Measurement of molecular weights of polyphosphazenes by vapor pressure osmometry

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.

Abstract: The measurement of molecular weight of polydi (methoxy-ethoxyethoxy) phosphazene (MEEP) by vapor pressure osmometry was investigated.The effect of solvents and temperature on determination 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℃ for stability.Single-spot method is simpler and quicker than multi-spots method.So singlespot method can be used to determine molecular weights of polyphosphazenes.