多检测GPC/SEC技术在高分子表征中的应用—聚(α-甲基苯乙烯-异戊二烯)二嵌段共聚物的溶液性质

Use of Multiple Detectors GPC/SEC in Polymer Characterization -The Solution Properties of Poly(α-methylstyrene)-Polyisoprene Diblock Copolymer

采用体积排斥色谱法 (SEC) /示差折光指数 (RI) /直角激光光散射 (RALLS) /示差粘度 (DV )三检测联用技术 ,在THF为溶剂、2 5℃的条件下表征了聚 (α 甲基苯乙烯 异戊二烯 ) (PαMS PI)二嵌段共聚物 ;计算得到了PαMS PI分子的无扰尺寸A为 0 .0 778nm·mol1/ 2 ·g-1/ 2 ;根据PαMS PI与PS分子的无扰尺寸A ,比较了两者在 2 5℃、THF溶剂体系中的链柔性程度 ,证明在此体系中PαMS PI与PS的链柔性程度相当 ;验证了PαMS

Poly(α methylstyrene) polyisoprene(PαMS PI) di block copolymers were characterized via SEC/RI/RALLS/DV in THF at 25?℃. The unperturbed dimensions of PαMS PI and PS were calculated by using one mathematical procedure for the extrapolation. Then the value of the unperturbed dimension of PαMS PI was obtained and that was 0.077?8?nm·mol 1/2 ·g 1/2 . It was demonstrated that the chain flexibility of PαMS PI and PS didn't differ much in THF at 25?℃ by comparing the unperturbed dimensions of the two.The universal calibration of PαMS PI was also confirmed.