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运用凝胶渗透色谱-光散射联用技术(GPC-LALLS)测定聚合物的长链支化度的基本原理是:在将聚合物分子按其流体力学体积顺序分离的同时,通过光散射仪逐滴测定溶液中聚合物的分子量。经过对谱图上逐点进行扩展效应的改正,通过普适标定线,求出支化分子与线型分子回转半径的比值,以计算试样的支化度及其分布。具体方法如下:
The basic principle of GPC-LALLS for determining the degree of long chain branching of polymers is that while the polymer molecules are sequentially separated according to their hydrodynamic volume, they are separated by a light scattering instrument Drops determine the molecular weight of the polymer in solution. After the correction of point-by-point expansion effect on the spectrum, the ratio of branching molecules to the radius of gyration of linear molecules was calculated by universal calibration line to calculate the degree of branching and its distribution. Specific methods are as follows: