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本文介绍利用以各种孔径的渗透膜隔开的多级渗透室,进行渗透分级,来测定聚丙烯酰胺的流体动力半径大小及其分布。美国Nucleopore Membrane Co生产的中子穿孔薄膜,能够满足本实验对渗透膜的要求。将达到渗透平衡后的聚丙烯酰胺溶液,通过GPC色谱柱,以除去低分子杂质。用UV检测器测定其吸收峰高度,以确定各渗透室在平衡时的相对浓度。根据各渗透室渗透膜的孔径大小及各室的相对浓度,就可求出聚丙烯酰胺的平均流体动力半径及半径分布来。如有需要,可由此来计算其平均分子量和分子量分布。
This article describes the use of a variety of pore size of the porous membrane separated by multi-stage permeation grading, to determine the size and distribution of hydrodynamic radius of polyacrylamide. The neutron perforation film produced by Nucleopore Membrane Co in the United States can meet the requirements of this experiment for the permeable membrane. The infiltrated polyacrylamide solution will be passed through a GPC column to remove low molecular impurities. The UV absorbers were used to measure the height of their absorption peaks to determine the relative concentration of each osmotic cell at equilibrium. According to each osmosis membrane osmosis membrane pore size and the relative concentration of each chamber can be obtained polyacrylamide average hydrodynamic radius and radius distribution. If necessary, its average molecular weight and molecular weight distribution can be calculated therefrom.