凝胶渗透色谱-多角度激光散射测定聚乙二醇分子量  

Determination of Molecular Weight of Polyether Glycol by Size Exclusion Chromatography-Multi Angle Laser Light Scattering

作　　者：程广文[1] 范晓东[1] 周志勇[1] 田威[1] 

机构地区：[1]西北工业大学理学院应用化学系,陕西西安710072

出　　处：《高分子材料科学与工程》2008年第10期127-130,共4页Polymer Materials Science & Engineering

基　　金：国防科工委"十一五"计量重点项目

摘　　要：以一种低分子量的聚乙二醇为例,对凝胶渗透色谱-多角度激光散射法的测试原理及影响因素进行了分析。研究发现,在测定齐聚物分子量时,适当提高进样浓度有利于减少测试误差,且dn/dc值随分子量的变化对测试结果影响不大,按示差峰出峰时间和激光峰的收峰时间确定有效峰面积,以及在激光信号最强的Debye图中通过去掉偏离直线较远的点后外推θ至0°所得到的测试结果误差均较小。Size Exclusion Chromatography-Multi Angle Laser Light Scattering （SEC-MALL） is a novel technique for molecular weight measurement. A low molecular weight polyether glycol was taken as an example to analyze the principle of SEC-MALL8 and its influencing factors. It is found that the increase in sample concentration of oligomer can reduce measurement error. The variation of dn/dc possesses little effect on the result obtained. The determination of the effective peak area in accordance with the occurrence of the differential peak versus the laser peak disappearance can obtain a result with less measurement error, and the measurement error can also be reduced through removing the data which are deviated the straight line via extrapolation the data of θ to 0°in Debye curve.

关 键 词：凝胶渗透色谱-多角度激光散射 分子量 聚乙二醇 

分 类 号：O631.61[理学—高分子化学]