摘要
以β-环糊精(-βCD)为原料,通过调整交联剂甲苯-2,4-二异氰酸酯(TD I)用量,合成了亲水性能理想的不溶性β-环糊精聚合物(β-CDP)。利用红外光谱仪、X射线衍射仪、综合热分析仪进行了表征,同时对溶解度和溶胀能力进行了测定。结果表明,TD I与-βCD发生交联后,生成的聚合物保留了β-CD的空腔结构,分解温度提高至350℃。同时,该聚合物在常见溶剂中的溶解度低于0.1%,在水中的溶胀能力仅为0.4 mL/g,说明产物在热稳定性、化学稳定性和机械强度等方面均得到了提高。最后,将该聚合物用于肉桂醛氧化生成苯甲醛的反应,催化效果明显,苯甲醛的收率提高至48%,且可重复使用。说明该聚合物不仅保留了-βCD的包结催化性能,并且能够稳定地用于水相有机反应中。
Insoluble β-cyclodextrin polymers（β-CDP） were prepared with β-cyclodextrin（β-CD） as base material and 2,4-diisocyanatotoluene（TDI） as crosslinking agent.The amount of TDI was adjusted in order for the obtained polymers to exhibit good hydrophilicity.The final products were characterized by means of FTIR spectroscopy,X-ray diffraction and thermogravimetric analysis,and their solubility in different solvents as well as their swelling capacity in water was measured.The results indicate that the polymerization between β-CD and TDI indeed occurred,and the final polymers retained the cavum structure of β-CD.In addition,the decomposition temperature was elevated to about 350 ℃,the solubility of β-CDP was lower than 0.1% in the organic solvents and the swell capacity was only 0.4 mL/g.All these results show that the products were improved in terms of their thermostability,chemical stability and mechanical strength.The β-CDP also exhibited highly catalytic activity for aqueous oxidation of cinnamaldehyde with hydrogen peroxide as oxidant.The yield of benzaldehyde reached 48% and the CDP was reusable.These results demonstrate that the polymers not only retain the inclusion ability of β-CD but also can be used for organic reactions in aqueous media.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2011年第6期525-528,534,共5页
Fine Chemicals
基金
国家自然科学基金(21036009)
2010年广东省高等学校高层次人才项目
中央高校基本科研业务费专项资金
广东省211项目~~
