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中国药典1977年版规定用粘度测定图解外推法求右旋糖酐的特性粘数。此法固属可靠并广为应用,但测定程序繁复,数据较多,加之绘制外推图,感到十分不便。近年来有很多一点法经验公式发表,只测一个浓度溶液的粘度数据代入公式,即可求出其相应聚合物的特性粘数〔η〕。有的因为引入了新的参数、过于复杂;有的求得值与图解外推法结果比较偏差较大、未能被广泛应用。因此寻找更为简便而可靠的测求右旋糖酐特性粘数的方法,仍有重要的实际意义。本文在刘佛云“对半法”求〔η〕值通用方程的基础
Chinese Pharmacopoeia 1977 edition of the provisions of the viscometer solution extrapolation of dextran intrinsic viscosity. This method is solid and reliable and widely used, but the cumbersome measurement procedures, more data, combined with the extrapolation diagram drawn, feel very inconvenient. In recent years there are a lot of experience formula published a little law, only to measure the concentration of a solution viscosity data into the formula, you can find the corresponding polymer intrinsic viscosity [η]. Some because of the introduction of new parameters, too complicated; some calculated value and the results of the graph extrapolation deviation, not widely used. Therefore, finding a more simple and reliable method of determining the intrinsic viscosity of dextran still has important practical significance. In this paper, Liu Foyun “on the semi-law,” [η] value of the common equation basis