天然半乳甘露聚糖类高分子改性中间体的制备

Preparation of Modified Intermediate of Galactomannan

以环氧氯丙烷作为交联剂,对天然半乳甘露聚糖类高分子田菁胶进行环氧活化。产物环氧化田菁胶是高分子改性重金属螯合剂必备中间体。探讨了环氧活化过程中各种环境因素如碱度、环氧氯丙烷用量、相转移催化剂用量、碱化时间、环氧化时间以及反应温度对环氧值的影响。环氧化过程中,最佳反应条件为:碱浓度为2.5mol/L;碱化时间为6小时;环氧氯丙烷用量为1.0mL/g碱化田菁胶;环氧化时间为3小时。

The epoxy functionality was introduced to galactomannan to give the galactomannan supported resins. The structure of the functionalized resins was characterized by FTIR. The influences of various reaction conditions on the epoxidation were discussed. The influencing factors on the epoxide number mainly comprise alkalizing time, epoxidizing time, and the amount of epichlorohydrin used. In addition, using phase transfer catalyst can increase epoxide number. Based on our experiment results the optimal reaction condition is as following： the concentration of aqueous solution of sodium hydroxide, the alkalizing time, the epoxidizing time and the amount of epichlorohydrin used are 2, 5 mol/L, 6 h, 3 h and 1.0 mL per 1 g of SG respectively.