目前常用的测聚碳酸酯平均分子量的一点法,是由相对粘度求特性粘度,再求平均分子量,如下式:式中〔η〕——特性粘度(升/克),η_(ST)——增比粘度,η_r——相对粘度,C——溶液浓度(克/升),M——平均分子量。用上述公式计算时,解式慢,运算繁。将上述二式作图,用图解法可直接由已知样品的溶液 At present, the common method of measuring the average molecular weight of polycarbonate is to find the intrinsic viscosity from the relative viscosity and then to obtain the average molecular weight, as shown in the following formula: [η] - intrinsic viscosity (L / g), η ST Increased specific viscosity, η_r - relative viscosity, C - solution concentration (g / L), M - average molecular weight. When using the above formula, the solution is slow and the operation is complicated. The above two-type plot, with graphic method can be directly from the known sample solution