【摘要】 本文用宽分布(M_w/M_n=6.3)及窄分布(M_w/M_n=1.22)两种模型函数,改变一系列加宽因子,“合成”了具有不同加宽程度的GPC谱图,然后计算平均分子量并与原模型分子量进行比较,考察分子量分布对峰加宽改正程度的影响.结果表明:分子量分布宽、窄在峰形改正上有着明显差异,窄分布要比宽分布改正得多.但对于分子量平均值来说,宽分布与窄分布的峰加宽改正程度是相同的.因此,通常认为宽分布试样在平均分子量计算时可以忽略峰加宽改正的说法是一种误解。更多还原

【Abstract】 Two model functions with broad distribution (Mw/Mn= 6.3) and narrow distribution (Mw/Mn= 1.22) were used in this paper. The effect of the broad and narrow distribution on the extent of correction of instrumental spreading has been examined. The calculated results showed that the differences of molecular weight, distribution of samples affect only the shape of chromatograms but not the extent of average molecular weight correction. The opinion prevailed in literature that peak broadening correction for samples with broad molecular weight distribution is negligible in comparison with that of narrow molecular weight distribution is a misunderstanding.更多还原