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在体积百分浓度为50%1,3-丙二醇、0.2 mol/L Na Cl和水溶剂条件下,消除疏水缔合聚合物(HAWSP)溶液中疏水缔合作用,屏蔽溶液中的聚电解质效应,使HAWSP分子在稀溶液中处于单分子分散状态.然后利用膜孔径分离原理,选择不同孔径的微孔滤膜,用微孔滤膜流动实验装置对疏水缔合聚合物进行分级,将不同分子量的聚合物分离开来.用二次方程拟合滤出液质量-过滤时间关系曲线得到各级分聚合物溶液的质量,以分光光度法测定各级分聚合物溶液的浓度,根据质量和浓度计算得到各级分的累积百分含量.结合静态光散射和毛细管法标定了疏水缔合聚合物Mark-Houwink方程[η]=0.182M~(0.586),用于准确测定疏水缔合聚合物各个级分的分子量.选择四参数方程曲线,根据各级分的分子量M和累积百分含量W,得到分子量的分布曲线.与动态光散射分析进行比较的结果表明,两种方法测试结果一致.
Under the condition of 50% 1,3-propanediol, 0.2 mol / L NaCl and water solvent, the hydrophobic interaction in the solution of hydrophobic association polymer (HAWSP) is eliminated, the polyelectrolyte effect in the shielding solution is shielded, So that HAWSP molecules in a dilute solution in a single molecular dispersion.Then the use of membrane pore size separation principle, choose different pore size of the microporous membrane, microporous membrane flow experimental device for the classification of hydrophobic association polymers, different molecular weight The polymer was separated, and the quadratic equation was used to fit the mass-filtration time relationship of the filtrate to obtain the mass of the polymer solution in each fraction. The concentration of the polymer solution in each fraction was determined by spectrophotometry and was calculated on the basis of mass and concentration The cumulative percentage of each fraction was obtained.The Mark-Houwink equation of [η] = 0.182M ~ (0.586) was calibrated by static light scattering and capillary method, Molecular weight of the selected four-parameter equation curve, according to the molecular weight of each fraction M and the cumulative percentage W, the molecular weight distribution curve obtained with the dynamic light scattering analysis results show that the two methods test results are consistent .