RI-UV双检测器GPC法测定SBS的分子量分布

Determination of Molecular Weight Distribution by Gel Permeation Chromatography with RI-UV Double Detectprs

SBS是一种新型的高分子材料,是苯乙烯-丁二烯的嵌段共聚物,它的聚苯乙烯(PS)段对紫外光有吸收,聚丁二烯(PB)段对紫外光无吸收。采用RI-UV(示差-紫外)双检测器GPC法同时测定此共聚物的分子量分布和组成分布,Runyon等在计算中假定:SBS分子的流体力学体积可看作相应组成的均聚物分子的流体力学体积之和,以及均聚物的校正曲线斜率相同,其SBS分子量的计算式为,

Based on the assumption suggested by Runyon and the results obtained by Tung for SBS molecular weight distribution, the equations used for calculating the molecular weight and Mark-Hu wink constants are presented in this paper(?) Using the equations to process the average molecular weight data of GPC with Shodex A-S06 column and Rt-UV. double detectors satisfactory results are obtained.