Ⅳjtll phase.porousfilling known medium.The molecular separation monodispersepolystyrene伊S)withweight isusedas whichtherelativemolecularof iscalculated standard,by weightpolymer retentiontimeofthe in or based011 the polymer columnthe comparing separation volumeof withthoseofthestandard afast elution leaching...
聚酰胺酸分子量的GPC表征及Mark-Houwink方程参数的确定 摘要 内容摘要:聚酰胺酸(PAA)作为聚酰亚胺(PI)的前体,其分子量数据是研究聚 酰亚胺的热稳定性、化学稳定性、力学性能和电性能的重要依据,与聚酰亚胺材 料的使用性能和加工成型有密切关系。凝胶色谱法(GPC)是一种以溶剂作流动相, 以多孔性填料作分离介质的柱...
In aDRI detector, there is a change in the direction of a beam of light due to the difference in refractive index of polymer solution coming out of the columns compared to that of the pure solvent. That angular change is measured as a small displacement of the beam ...
Thus, it is important to ensure that columns are in a suitable condition for the desired separation task. Plate count determination is well suited for this purpose. Regularly controlling column performance is a recommendation for GPC/SEC users, and it is also mandatory to national and internati...