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采用交联聚苯乙烯凝胶柱和示差折光检测器测定环氧乙烷/四氢呋喃共聚醚分子量和分子量分布。在数均分子量2000～4000,与 VPO 测定结果相比较,偏差小于±8％。用3,5-二硝基苯甲酰氯对样品进行衍生化反应,处理后的衍生物用 GPC 分离并用双检测器检测,进行了官能度分布测定。样品的数均官能度多数为1.7.～2.0,官能度分布的分区表征表明,官能度在1.5～2.5的组分占90％以上。
Determination of Molecular Weight and Molecular Weight Distribution of Ethylene Oxide / Tetrahydrofuran Copolyether Using Crosslinked Polystyrene Gel Column and Differential Refractometer. In the number average molecular weight 2000 ~ 4000, compared with the VPO determination, the deviation is less than ± 8%. The sample was subjected to derivatization with 3,5-dinitrobenzoyl chloride. The treated derivative was separated by GPC and detected by a dual detector. The functional distribution was determined. The number average functionality of the samples was 1.7. ~ 2.0. The zoning characterization of the functional distribution showed that the functionalities of 1.5-2.5 accounted for more than 90%.