聚乳酸的MH方程常数及其GPC标定线的订定

The Determination of GPC Calibration Curve and Mark--Houwink Constants of Polylactic Acid

提出了聚乳酸Mark-Houwink方程(简称MH方程)常数订定的方法。订定了在35℃、四氢呋喃中聚乳酸的MH方程常数:K=2.59×10^(-4)dl/g,α=0.689。验证了K、α值的可靠性,GPC测[η]′和实测[η]间的相对偏差,一般在8.0％以下,最大不超过16.0％。

This paper presents a new method for determination of K and a of MH equ- ation of polylactic acid. The K and a for this kind of polymer in THF at 35t are 2.59×10^(-4)dl/g and 0.689 respectively. The relative error of the new method is generally lower than 8.0%.