一点法求聚丙烯酸的特性粘数

CALCULATION OF INTRINSIC VISCOSITY OF POLYACRYLIC ACID FROM ONE-POINT MEASUREMENTS

测定了聚丙烯酸（ＰＡＡ）和丙烯酸／甲基丙烯酸－β－羟乙基酯（ＡＡ／ＨＥＡ）的特性粘数，比较了用九个经验式求得的特性粘数差异，指出了实验体系的Ｈｕｇｇｉｎｓ常数ｋ′较大（０．４４３～０．７２６）是造成部分计算结果偏差较大的原因，提出了一个ｋ′取０．６４的简易一点法公式。用该公式计算的２４个数据中，相对偏差小于１％的数据为１２个，好于用已知九个公式计算的结果。

Intrinsic viscosities of polyacrylic acid(PAA) and copolymer of acrylic acid and β-hydroxyethyl methylacrylate (AA/HEA) were determined. The differences of these viscosities obtained by nine empirical formulae were compared and the reason why some results from those formulae have large deviations is that the experimental systems have large Huggins'constants (k' from 0.443～0.726). A modified formula for one-point measurement with k' equal to 0.64 was proposed, which is easy for calculating intrinsic viscosity. Among 24 viscosities from the new formula, 12 viscosities have smaller deviations than 1%, which is better than the results from the nine known formulae.