高取代度辛烯基琥珀酸环糊精酯的制备及其性能研究

Preparation of octenylsuccinic acid cyclodextrin ester with a high substitution degree and study on its properties

以辛烯基琥珀酸酐(OSA)与β-环糊精(β-CD)为原料,采用优化后的非均相反应制备高取代度辛烯基琥珀酸环糊精酯(OS-β-CD)。通过FT-IR分析改性前后样品特征峰的变化表明,成功合成出了辛烯基琥珀酸环糊精酯。通过TGA分析发现,改性后样品的热稳定性有所降低,但耐热稳定性仍能满足其在多种领域中的应用。与β-环糊精相比,OS-β-CD在冷水中的溶解性能得到明显提高,OS-β-CD质量分数为15%时,溶液的透光率仍高达90%。随着分子链段中辛烯基琥珀酸阴离子基团引入量的增加,溶液的表面张力降低,最低可达44.09 mN/m,同时分子间静电排斥作用和支化度的提高抑制了OS-β-CD分子的重新排列,促进了酯化物溶液的耐冻融稳定性。

Octenylsuccinate cyclodextrin ester(OS-β-CD)with a high substitution degree is prepared from octenylsuccinic anhydride(OSA)andβ-cyclodextrin(β-CD)by means of the optimized heterogeneous reaction.The characteristic peaks of the samples before and after modification are compared by FT-IR,indicating that octenylsuccinate cyclodextrin ester is successfully obtained.It is found through thermogravimetric analysis(TGA)that the modified samples have a declined thermal stability,but their thermal stability is enough to support its application in many aspects.Compared withβ-cyclodextrin,OS-β-CD shows a significantly improved solubility in cold water.The transmittance of the solution is still as high as 90%when the mass fraction of OS-β-CD is 15%.With the increasing addition amount of anionic group of octenylsuccinic acid within molecular chain section,the surface tension of the solution drops,with the lowest value reaching 44.09 mN·m^(-1).The electrostatic repulsion between molecules and the increase of branching degree inhibit the rearrangement of OS-β-CD,and promote the anti-freeze thaw stability of the esterification solution.