用GPC普适校正法测定低相对分子质量聚异丁烯的相对分子质量及其分布

MEASUREMENT OF MOLECULAR WEIGHT AND ITS DISTRIBUTION FOR LOW MOLECULAR WEIGHT POLYISOBUTYLENE BY GPC UNIVERSAL CALIBRATION

采用凝胶渗透色谱仪，以已知特性粘数［η］的宽分布聚异丁烯为标样，在计算机上，采用“ＭｏｔｅＣａｒｌ”计算法计算聚异丁烯的Ｍａｒｋ－Ｈｏｕｗｉｎｋ方程的最佳Ｋ和α值，经普适校正法建立聚异丁烯的校正曲线。结果表明，用ＧＰＣ法测定的聚异丁烯数均相对分子质量与膜渗透法（ＶＰＯ法）测定结果相比较，其相对误差在５％以下；提供的计算Ｋ和α值的方法既快速简便又具有实用性。

A calibration curve of polyisobutylene was established by using low molecular weight polyisobutylene with different and molecular weight distribution curve of GPC as standards, and Mote Carlo method for determining the optimal values of K and α of Mark Houwink equation with the application of GPC universal calibration method. The number average molecular weight of polyisobutylene determined by the curve was coincided with that measured by Knauer membrane osmometer, and the relative error was less than 5%. The proposed method for determining the values of K and α was quick, convenient and practical.