β-环糊精淀粉类树脂的制备和电流变性能

Preparation and electrorheological properties of β-cyclodextrin-starch resin polymer

分别由不含淀粉、含水溶性淀粉或不溶性淀粉的β-环糊精与环氧氯丙烷的聚合反应,制备出3种环境友好的β-环糊精交联聚合物和淀粉类树脂(NS-β-CDP、WSS-β-CDP和CLS-β-CDP)用FT-IR和激光Raman光谱对其进行了分析,发现β-环糊精交联聚合物以及β-环糊精淀粉类树脂均保留了环糊精的空腔结构.用NS-β-CDP、WSS-β-CDP和CLS-β-CDP分别与二甲基硅油配制了电流变液,研究了电流变活性。结果表明,含淀粉的聚合物的电流变活性和电场耐受能力均比NS-S-CDP的高。淀粉参与共聚后,淀粉的柔性对环糊精聚合物的刚性腔体具有很好的分散作用。

Three green β-cyclodextrin crosslinked polymer and starch resins with β-cyclodextrin (NS- β-CDP, WSS- β-CDP and CLS- β-CDP) were prepared by copolymerization onto a mixture of β-CD and epichlorohydrin in the absence of starch or in the presence of water-soluble and water-insoluble starch, respectively. The structure of these polymers was characterized by FT-IR and laser Raman spectrophotometers. The results demonstrated that all of these polymers kept the original structural character of β-CD and also showed that copolymerization between starch and β-CD occured. In this paper, three electrorheological (ER) fluids were prepared by the dispersion of NS- β-CDP, WSS- β-CDP and CLS- β-CDP in silicone, respectively. As a result, it was obviously observed that both WSS- β-CDP and CLS- β-CDP ER fluids have higher ER effect and better electricity-fast properties than that of NS- β-CDP. A typical example is that the yield stress of WSS- β-CDP can be 6.2 kPa under a dc electrical field of 4 kV/mm at room temperature, and furthermore it displays a high ER performance at 95 CCCC. This may be due to CD rings which are dispersed by starch in the copolymers.