多检测GPC/SEC技术在高分子表征中的应用Ⅶ.聚己内酯(PCL)的溶液性质

Use of Multiple Detectors GPC/SEC in Polymer Characterization Ⅶ. The Solution Properties of Polycaprolactone

采用体积排斥色谱法 /示差折光指数 /直角激光光散射 /示差粘度三检测联用技术表征了聚己内酯 ;探讨了聚己内酯的溶液行为 ;订定了在 2 5℃聚己内酯 /THF体系的MHS方程 ;计算并比较了无扰均方末端距 <r2 >0 和无扰旋转半径 <R2g>0 的关系。

Polycaprolactone was studied by SEC/RI/RALLS/DV in THF at 25 ℃. The solution behavior was discussed. The parameters K and α of MHS equation were determined. The relationship between unperturbed mean-square end-to-end distance <r 2> 0 and unperturbed mean-square radius of gyration <R 2 g> 0 was established. The universal calibration of PCL/THF system was justified and the Flory's characteristic ratio C ∞ was calculated.