利用Mark-Houwink常数求算聚合物的非干扰参数

利用Mark-Houwink常数求算聚合物的非干扰参数 EVALUATION OF THE UNPERTURBED PARAMETERS OF POLYMERS FROM MARK-HOUWINK CONSTANTS 程叔耀 Cheng Shuyao first-author 杨雄辉 Yang Xionghui 秦元新 Qin Yuanxin 本文从Flory-Fox的特性粘度理论公式和Mark-Houwink特性粘度与分子量关系的经验公式出发,导出了一个利用Mark-Houwink常数K m 和α求算聚合物非干扰参数K θ 的线性公式。只要已知K m 及α之值,就可以在此Mark-Houwiak公式能适用的分子量范围内取值,根据此公式进行作图并线性外推,简便地由截距求得非干扰参数K θ 之值。测定和选择了不同种类聚合物样品的若干组K m 和α值。将各组K m 和α值根据上述公式作图并线性外推,得到各试样的非干扰参数K θ 值,与文献上用经典方法测定的K θ 值进行比较,结果很相符合。 In this paper.a formula for evaluating the unperturbed parameters K a from Mark-Houwink constants （K m , α）, is obtained from the combination of the theoretical expression obtained by Flory and Fox with the Mark-Houwink equation, as follows: ln K m M < sub > a-2/1 =ln K θ +3×（K 8 /K M ） C M （ψ 1 -K 1 ）M （1-α） If K m and α are known for a given polymer-solvent system, according to above formula, we can plot graphically as ln K m M （a-1/2） versus M （1-α） in the mo-lecular weight range which is suitable for Mark-Houwink equation, a straight line is obtained and the unperturbed parameter K θ of polymer can be obtained easily from the intercept of the straight line with the ordinate According to above method, the values of K θ were determined from the values of K m and α for several samples obtained by our experimental appar-atus consisting of a combination GPCand viscosimeter, and obtained from the literature They are in good agreement with the values of K θ obtained by cla-ssical methed in the literature 非干扰尺寸 非干扰参数 Mark-Houwink常数 GPC—粘度计 Unperturbed dimension Unperturbed parameter Mark-Houwink constants GPC-giscosimeter 1988-03-01 2021-04-01 3