气相渗透法测定数均分子量的仪器常数问题研究

STUDIES ON THE PROBLEM OF THE INSTRUMENTAL CONSTANT IN VAPOUR PRESSURE OSMOMETRY

讨论了蒸气压渗透计仪器常数的分子量依赖性问题．通过对某些已知分子量化合物的温差信号随时间变化的研究，提出了测量四个低分子一种改进的ＶＰＯ信号的测量手续和数据处理方式，可以得到更为准确的数均分子量．

he problem of the dependency of the instrumental constant K of vapor pressure osmometry on the molecular weight of the sample was studied by measuringthe variation of temperature difference signals with time for four low molecular weight orgahic compounds and ten narrow MWD oligomeric polystyrene samples with known average molecular weights. A modified procedure for measuring VPO signals and data treatment which leads to more accurate number average molecular weight was proposed.