GPC-粘度计联用装置中特性粘数加宽改正的经验方法

本文提出了一个在GPC-粘度计联用装置中特性粘数加宽改正的经验方法.本方法是保持特性粘数的值不变,而改正相应的淋出体积之值.对于线性GPC柱组,改正的方程为: V_(i,corr.)=V_i+(1+tgθ)(S_(i+1)-S_(i-1))/S_i用几个不同试样对此经验改正方法进行了实验验证,均得到了满意的结果.

AN EMP IRICAL METHOD OF CORRECTION IN THE EXPERIMENT OF GPC COUPLED WITH VISCOMETER

A simple empirical correction method for the intrinsic viscosity in the experiment of GPC combined with viscometer has been presented in this paper. The values of η] remain unchanged. It is only necessary to correct the values of corresponding elution volume Vi. For linear GPC columns, an empirical correction equation was proposed as follows:where tgθ is the slope of uncorrected straight line in a plot of log η] vs V, Vi and Vi,corr are the uncorrected and corrected elution volume for count i respectively; 5i+1 Si-1 and Si represent corresponding area in chromatogram for count i + 1. i - 1. and i. This correction method is tested and verified by the broad sample and standard sample of polystyrene as well as the unfractionated and the fractionated samples of poly (vinylchloride) and chlorinated polyethylene. The results are satisfactory.