聚二甲基硅氧烷的通用粘度方程和无扰尺寸

A UNIVERSAL INTRINSIC VISCOSITY-MOLECULAR WEIGHT EQUATION FOR POLYDIMETHYLSILOXANE AND ITS UNPERTURBED DIMENSION

本文提出了用非线性方程线性化的方法化简由程镕时和严晓虎最近提出的通用粘度方程,包括求其中三个参数的方法和化简手续。可以不用计算机,手续简便。用该方法计算出了聚二甲基硅氧烷新粘度方程的三个参数 由得到的K_θ计算了聚合物的无扰尺寸。结果与其它经验方程外推结果一致。新方程得到的无扰尺寸,不受分子量范围限制,无任意性。

A simple and convenient procedure for the transforming the Cheng-Yan instrinsic visco-sity-molecular weight equation with three paramaters,A,B, and K_θ:[η] = K_θ[ A + (1 + AB)M^(1/2) + BM]into a lincar equation of M^(1/2):([η] - [η]_o/(M^(1/2) - M_o^(1/2)) = [K_θ(1 + AB) + K_θBM_o^(1/2)] + K_θBM^(1/2)was proposed.The unperturbed dimension of polydimethylsiloxane obtained from the deducedequation is in agreement with the results from the empirical equations such as KF, SF andIF equations. The new equation avoids the arbitrainess of the empirical equations inestimating the unperturbed dimension.