多检测GPC/SEC技术在高分子表征中的应用 I.星形PS-PI共聚物的表征

Use of Multiple Detectors GPC/SEC in Polymer Characterization I. Star Polymer of Diblock Copolymer PS-PI

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） 三检测联用技术表征了星形ＰＳ－ ＰＩ共聚物。结果表明，当星形ＰＳ／ＰＩ共聚物多达３２ 臂时还是符合普适标定曲线；对于分子量与淋洗体积曲线，星形ＰＳ－ ＰＩ共聚物的臂数越多，向淋洗体积大的方向迁移得就越多；结构因子随星形高聚物臂数的增加而增加。ＳＥＣ／ＲＩ／ＲＡＬＬＳ／ＤＶ 得到了传统ＳＥＣ 不能获得的有关分子尺寸信息。

The star polymers of di-block copolymer PS-PI were studied by SEC/RI/RALLS/DV. The relationships between the number of arms and molecular size of the star polymers were suggested. As compared to polystyrene calibration curve, the migration trend of different number of arms of the star polymers was established. The universal calibration of star polymer up to 32-arm was justified. The structure factors (ε) of different number of arms were calculated. The results show that we can obtain a lot of useful information in addition to molecular weight capabilities and that the technique of SEC/RI/RALLS/DV is especially a useful tool for characterizing star polymer, which can not be characterized by conventional SEC.