无规聚丙烯链的柔性和温度特性

Flexibility and Temperature Features of Atactic Polypropylene Chain

用改进的旋转异构态模型和计算方法 ,研究聚丙烯链均方回转半径〈S2 〉与分子量 M的关系 ,经计算 (〈S2 〉/M) 0 .5为 0 .0 3 3 7nm· ( mol/g) 0 .5,均方回转半径的温度系数为 -0 .3 5×1 0 - 3 /(°) 。

By means of the improved rotational isomeric state model and method, the dependence of mean-square radius of gyration <S 2> on molecular weight M was estimated (<S 2>/M) 0.5=0.033 7 nm·(mol/g) 0.5 for long atactic polypropylene chains. The temperature coefficient of the mean-square radius of gyration, κ was calculated to be -0.35×10 -3/(°), which is approaching to the experiment data.