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对十一个未经分级的多分散稀土顺丁橡胶试样作了渗透压和粘度的测量,计算得到的数均分子量〈M〉_n及特性粘数[〈η〉]列于表中。以〈[η]〉和〈M〉_n的对数作线性回归,得到: 〈[η]〉=0.039〈M〉_n~(040) (1)粘度方程参数α的表观值仅0.40,比1/2还小。这是由于各试样的分子量分布宽度不相同所致。 用凝胶色谱测量高分子的分子量分布,须作扩展效应的改正。所用凝胶色谱柱的扩
The measurements of the osmotic pressure and the viscosity of eleven unsprayed, polydisperse, rare earth, butadiene rubber samples are tabulated in terms of number average molecular weight _n and intrinsic viscosity [<η>]. Linear regression of the logarithm of <[η]> and _n gives: [[η]> = 0.039 _n ~ (040) (1) The apparent value of the parameter α of the viscosity equation is only 0.40, 1/2 is still small. This is due to the fact that the width of the molecular weight distribution of each sample varies. The molecular weight distribution of the polymer measured by gel chromatography must be corrected for the spreading effect. Expansion of the gel column used